Skocz do pozycji: 1.

Tytuł:

Influence of winding and shaft cooling on the thermal characteristics of a traction machine for heavy-duty distribution transport

Autorzy:

Groschup, Benedikt
Butterweck, Daniel
Hameyer, Kay

Powiązania:

https://bibliotekanauki.pl/articles/27309937.pdf

Data publikacji:

2023

Wydawca:

Polska Akademia Nauk. Czasopisma i Monografie PAN

Tematy:

cooling
thermal design
winding cooling

Opis:

This paper studies the influence of different cooling technologies on the power density of a traction machine for heavy-duty distribution transport. A prototype induction machine is built with a housing cooling jacket, potted end-windings, entire winding cooling, and shaft cooling. Electromagnetic finite element and thermal lumped-parameter models are parameterized and verified using test bench measurements. The influence of each thermal resistance along the heat paths is studied and discussed. The results are used for studying different cooling technologies. The results indicate an improvement of the continuous power density up to 108% using shaft cooling and up to 15.6% using entire winding cooling.

Źródło:

Archives of Electrical Engineering; 2023, 72, 3; 769--784
1427-4221
2300-2506

Pojawia się w:

Archives of Electrical Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Solar air conditioning system using desiccant wheel technology as a solution for Iraq

Autorzy:

Al-Ahmedi, Karrar

Powiązania:

https://bibliotekanauki.pl/articles/132049.pdf

Data publikacji:

2019

Wydawca:

Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.

Tematy:

cooling
solar electric cooling system
solar thermal cooling system

Opis:

The electrical energy consumption in Iraq has increased sharply in the past few years. Modern energy efficient technologies are desperately needed for the national energy policy. The main purpose of this paper is to analyze the various cooling systems, using the readily available solar energy to cool down the buildings in Iraq during hot weather days. This paper presents the best solar cooling system which can be installed in Iraq for solar cooling. It also focuses on the type of thermally driven system which can be used for solar cooling. It is fact that many buildings in Iraq are designed far away from being energy efficient, hence this paper focuses on the standards which can be developed and can be used in the future on residential buildings from the energy point of view, with a suggestion to establish such solar cooling projects in Iraq. Systems have been used successfully in northern Europe and a number of studies have demonstrated that solar energy can be used to drive the system in this region. However, to date, desiccant cooling has not been used in Iraq. This paper presents the results of a study, in which a solar desiccant cooling model will use to evaluate the potential for using solar power to drive a desiccant cooling system in Iraq. The study demonstrates that solar desiccant cooling is feasible in Iraq, provided that the latent heat gains experienced are not excessive. However, if the relative humidity experienced are too high then desiccant cooling becomes impracticable simply because the regeneration temperatures required are excessive.

Źródło:

Modern Engineering; 2019, 2; 88-93
2450-5501

Pojawia się w:

Modern Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Practical Approach to Optimal Cooling System Design for a Production Line Consisting of Plastic Injection Moulding Machines in Polish Specific Climat Conditions

Autorzy:

Bernacki, Maciej
Kaminski, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/2064691.pdf

Data publikacji:

2020

Wydawca:

STE GROUP

Tematy:

cooling system
injection moulding
dry cooling

Opis:

The paper presents and describes cooling systems mainly used in industrial plants specialized in production based on injection moulding machines. Each solution is rated taking into account investment costs, technical complexity, exploitation costs and system flexibility in general. With regard to dynamically changing law regulations linked to refrigeration installations, mainly F-Gases Act, during optimal system selection new restrictions were respected. This approach ensures long-term exploitation without additional complications. The paper contains characteristics of cooled facility, i.e. production plastic plant using injection moulding machines, presents specifics for this type of application where two extremely different cooling processes are placed in parallel. One task is heat collection from injection moulds to ensure short production time and produced details recurrence, the second is keeping hydraulic oil temperature between temperature limits – this process ensures proper oil viscosity and prevents its premature wear.

Źródło:

Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 116--127
2545-2827

Pojawia się w:

Multidisciplinary Aspects of Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Numerical Assessment of the Experimental Thermoelectric Cooling System Effectiveness

Autorzy:

Gołębiowska, Justyna
Widomski, Marcin K.

Powiązania:

https://bibliotekanauki.pl/articles/2202299.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

COP
numerical modeling
thermoelectric cooling
cooling effectiveness

Opis:

Solid-state thermoelectric elements, such as thermoelectric (TE) modules, can be used as cooling devices. Small-sized TE modules, characterized by: lack of moving parts, no required refrigerants application as well as variable possible installation and operation positions, allow, in several specified cases, achieving the advantage in cooling process over the conventional refrigeration devices. This paper presents the results of the preliminary numerical determination of energetic efficiency of thermoelectric cooling system, applied for cooling a small-scale experimental room. The heat exchangers used in the cooling system consisted of heat sinks and radiators installed on the both sides of the TE module. The numerical assessment included in this paper, based on a 3D model reflecting the experimental room and thermoelectric cooling system, allowed determining the relation between TE module power supply characteristics and cooling effects, as well as time-related temperature distribution inside the modeled experimental room. The commercial modeling software FLUENT, ANSYS 12.0 by ANSYS Inc. was applied in numerical calculations. The results of the performed laboratory studies were used as a basis for model development, required input data, initial and boundary conditions. The results of laboratory tests showed the influence of amperage of power supply on the efficiency of cooling characteristics, as well as distribution of air temperature inside the experimental room. Calibration and validation of the developed model was also based on the results of laboratory experiment. The obtained results of numerical calculations showed the influence of amperage of power supply on efficiency of cooling characteristics as well as distribution of air temperature inside the experimental room.

Źródło:

Journal of Ecological Engineering; 2022, 23, 12; 99--110
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

A Numerical Study of The Heat Transfer Intensification Using High Amplitude Acoustic Waves

Autorzy:

Rulik, S.
Wróblewski, W.

Powiązania:

https://bibliotekanauki.pl/articles/177492.pdf

Data publikacji:

2018

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

cavity noise
sound wave cooling
flow over a cavity
transient cooling
blade cooling intensification

Opis:

The current practice in the efforts aiming to improve cooling conditions is to place emphasis on the application of non-stationary flow effects, such as the unsteady jet heat transfer or the heat transfer intensification by means of a high-amplitude oscillatory motion. The research presented in this paper follows this direction. A new concept is put forward to intensify the heat transfer in the cooling channels with the use of an acoustic wave generator. The acoustic wave is generated by a properly shaped fixed cavity or group of cavities. The sound generated by the cavity is a phenomenon analysed in various publications focused on the methods of its reduction. The phenomenon is related to the feedback mechanism between the vortices flowing from the leading edge and the acoustic waves generated within the cavity. The acoustic waves are generated by the interaction between the vortices and the cavity walls. Strong instabilities can be observed within a certain range of the free flow velocities. The investigations presented in this paper are oriented towards the use of the phenomenon for the purposes of the heat transfer process intensification. The first part of the work presents the numerical model used in the analysis, as well as its validation and comparison with empirical relations. The numerical model is constructed using the commercial CFD Ansys CFX-16.0 commercial program. The next part includes determining of the relationship between the amplitude of the acoustic oscillations and the cooling conditions within the cavity. The calculations are performed for various flow conditions.

Źródło:

Archives of Acoustics; 2018, 43, 1; 31-47
0137-5075

Pojawia się w:

Archives of Acoustics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Model of heat transfer in the stagnation point of rapidly evaporating microjet

Autorzy:

Mikielewicz, D.
Muszyński, T.
Mikielewicz, J.

Powiązania:

https://bibliotekanauki.pl/articles/240462.pdf

Data publikacji:

2012

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

chłodzenie mikrojetowe
chłodzenie powierzchniowe
CHF
microjet cooling
surface cooling

Opis:

The paper presents investigation into the single water microjet surface cooling producing evaporating film. Reported tests were conducted under steady state conditions. Experiments were conducted using the nozzle size of 70 and 100 [my]m respectively. In the course of investigations obtained were experimental relations between heat flux and wall superheating. It was proved that the phenomenon is similar to that of pool boiling but the boiling curves are showing a smaller value of critical heat flux (CHF) that the stagnant pool boiling. Values of CHF are also reduced with decreasing liquid subcooling. Theoretical model of surface cooling by evaporating microjet impingement in the stagnation point was described theoreticaly. Results of experiments were compared with predictions by the model showing a good consistency.

Źródło:

Archives of Thermodynamics; 2012, 33, 1; 139-152
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Computer flow simulation through a single cooling unit in the context of its construction
Komputerowe badania symulacyjne przepływu cieczy chłodzącej w aspekcie budowy konstrukcji modułu chłodzącego

Autorzy:

Dudziński, P.
Bieńczak, A.
Marcinkiewicz, J.

Powiązania:

https://bibliotekanauki.pl/articles/334423.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych

Tematy:

candy mass
cooling
cooling module
cooling fluid
simulation research
schładzanie
masa cukiernicza
moduł chłodzący
ciecz chłodząca
badanie symulacyjne

Opis:

The article includes the results obtained by the fluid flow simulation through a single candy cooling unit. The aim of this investigation was to verify the tabletop construction. It was found that there is a necessity for redesigning the original construction. The introduced modifications allowed reduction of the stagnation areas nearby the turn canals and the heat exchanger corners.
Komputerowe badania symulacyjne przepływu cieczy chłodzącej w aspekcie budowy konstrukcji modułu chłodzącego W artykule zamieszczono wyniki przeprowadzonych badań symulacyjnych przepływu cieczy chłodzącej na przekroju pojedynczego modułu chłodzącego stołu do schładzania mas cukierniczych. Badania przeprowadzono na potrzebę weryfikacji konstrukcji stołu. Wykazano, że zaistniała konieczność wprowadzenia zmian w konstrukcji, które pozwoli na zmniejszenie stref stagnacji przepływu w okolicach kanałów nawrotnych oraz narożników płaszcza wodnego.

Źródło:

Journal of Research and Applications in Agricultural Engineering; 2014, 59, 1; 30-33
1642-686X
2719-423X

Pojawia się w:

Journal of Research and Applications in Agricultural Engineering

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 8.

Tytuł:

Wykorzystanie ogniw Peltiera w układach chłodzących pojazdów autobusowych
Use Peltier in cooling systems of vehicles bus

Autorzy:

Pniewski, R.
Kowalik, R.
Sadowski, E.

Powiązania:

https://bibliotekanauki.pl/articles/315528.pdf

Data publikacji:

2016

Wydawca:

Instytut Naukowo-Wydawniczy "SPATIUM"

Tematy:

ogniwo Peltiera
TEC
układ chłodzący
autobus
Thermoelectric cooling
cooling systems
bus

Opis:

W artykule omówiono zjawisko Peltiera z naciskiem na analizę modelu matematycznego opisującego zjawiska zachodzące na elemencie półprzewodnikowym odpowiedzialnym za regulacje temperatury. Zaprezentowany model matematyczny wykorzystany do opracowania programów symulacyjnych, z których uzyskane wyniki zaprezentowano w końcowej części referatu. Przedstawiono również opis możliwości wykorzystania ogniw Peltiera jako elementów wspomagających układ klimatyzacyjny w autobusach.
Article shows the Peltier effect with emphasis on the analysis of the mathematical model describing the phenomena on semiconductor element responsible for regulating the temperature. Presented mathematical model used to develop simulation programs, of which the results were presented in the final part of the paper. Also contains a description of the possibilities of using a Peltier element supporting the air conditioning system in the buses.

Źródło:

Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 6; 1083-1086
1509-5878
2450-7725

Pojawia się w:

Autobusy : technika, eksploatacja, systemy transportowe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Experimental Study of Temperature Influence on the Performance of PV/T Cell under Jordan Climate Conditions

Autorzy:

Al-Odat, Mohammed Qassim

Powiązania:

https://bibliotekanauki.pl/articles/2202185.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

PV module
electrical conversion
electrical efficiency
water cooling
cooling
cell temperature

Opis:

The electrical performance and the productivity of PV module depend on two main parameters, i.e. the radiation intensity and the cell operating temperature. The module electrical efficiency and productivity are significantly reduced as its temperature increases. Accordingly, cooling of PV modules is one of the most effective techniques to obtain higher efficiency and productivity as well as to reduce the degradation modes of PV modules due to high temperatures. This research work presents an experimental study carried out to investigate the effect of PV module cooling on the performance of PV module under Irbid city (Jordan) climate conditions. It was found that the electrical efficiency and the productivity of the PV modules were approximately enhanced by 14%. Therefore, water cooling of the PV modules is essential to enhance their performance.

Źródło:

Journal of Ecological Engineering; 2022, 23, 10; 80--88
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Heat mitigation by greening the cities, a review study

Autorzy:

Venhari, A.A.
Tenpierik, M.
Hakak, A.M.

Powiązania:

https://bibliotekanauki.pl/articles/10017.pdf

Data publikacji:

2017

Wydawca:

Fundacja na Rzecz Młodych Naukowców

Tematy:

heat mitigation
urban greening
city
cooling extension
cooling intensity
climate property

Opis:

In the past decades, many studies have proposed urban greening as a method to mitigate the rising temperatures in cities and urban heat islands. The cooling effect of urban green spaces can be divided into two components; cooling intensity and cooling extension. These two components are affected by different factors. This paper provides a review of research on the impact of urban greening on temperature and on the parameters that have an effect on that. Based on this review, two categories that have an effect on cooling intensity and cooling extension were identified: internal factors and external factors. These play an important role in the effectiveness of urban green spaces. As internal factors or indexes, the following were extracted; Size index, Shape index, Vegetation species and Tree canopy coverage are the most common indexes in most of the studies. The external factors can be divided into climate and surrounding properties. A discussion of the reviewed studies reflects the impact of each index on the cooling intensity and cooling extension. The existing methods and techniques for determining these indexes have also been considered in this paper. As such, this study is helpful for designers and planners for decision-making during the design phase.

Źródło:

Environment, Earth and Ecology; 2017, 1, 1
2543-9774
2451-4225

Pojawia się w:

Environment, Earth and Ecology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

A Review of Desiccant Dehumidification Technology

Autorzy:

Al-Ahmedi, Karrar

Powiązania:

https://bibliotekanauki.pl/articles/132065.pdf

Data publikacji:

2020

Wydawca:

Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.

Tematy:

dehumidification technologies
solar cooling

Opis:

This study focuses on dehumidification technologies. It identifies the different types of dehumidification technologies and seeks to understand each technology’s competitive advantages. On the various technologies, the study concentrates on three standard systems. The systems are the solid desiccant-wheel, solid desiccant air conditioner, and the liquid desiccant dehumidification system. The study establishes the characteristics of each of them and how they can be preferred. The study also looks at the applicability of the technologies to different uses and discusses in details application in hotels, supermarkets, and office blocks. In these application areas, the study focuses on benefits and possible consequences for the non-adoption of such systems. The study establishes reasons to support the relevance of this technology to those essential industries. This study concludes by looking at current developments in dehumidification technology. A focus is made on the drivers for the advancement and a discussion of some of the recent improvements. The study adopts this discussion to help advise on the future of dehumidification technology.

Źródło:

Modern Engineering; 2020, 1; 38-42
2450-5501

Pojawia się w:

Modern Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

The determination of properties of heating and cooling systems in greenhouse

Autorzy:

Ertop, H.
Atilgan, A.

Powiązania:

https://bibliotekanauki.pl/articles/101259.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN

Tematy:

Antalya
greenhouse
heating
cooling

Opis:

In this study, the heating and cooling conditions of the greenhouses in Antalya were examined and suggestions were made for solutions of the problems that emerged. The Simple Random Sampling Method was used in determining the number of enterprises to be surveyed. The number of enterprises to be surveyed was determined as 246 with a 90 % confidence limit and 10 % error rate. It was determined that the greenhouses enterprises surveyed were heating at 96.34%. It has been determined that the most commonly preferred type of heater in the region is the stove and that the stove is heated only to protect the product from frost damage. In accordance with the data obtained from the research area, it was determined that one stove was used for 1000 m2 greenhouse floor area. It has been determined that 92.68% of the surveyed greenhouse enterprises are trying to reduce the excess temperature inside greenhouse by natural ventilation. It was determined that both the sidewall and roof ventilation were made at 45.93% of the greenhouse enterprises where examined in the research area. It has been determined that the ratio of ventilation area to greenhouse floor area changes between 10 and 15 in 32.52% of greenhouse enterprises and this ratio changes between 15 and 20 in 41.46%. As a result, the heating and cooling properties and problems encountered of the greenhouse enterprises in the study area were determined and necessary precautions to be taken.

Źródło:

Infrastruktura i Ekologia Terenów Wiejskich; 2017, III/2; 1115-1129
1732-5587

Pojawia się w:

Infrastruktura i Ekologia Terenów Wiejskich

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

The Prospects of Abrasive Treatment of Tough-To-Machine Materials

Autorzy:

Palacz, Magdalena
Ivanova, Tatiana N.
Kozlov, Alexander M.
Kaniak, Wojciech

Powiązania:

https://bibliotekanauki.pl/articles/2064680.pdf

Data publikacji:

2021

Wydawca:

STE GROUP

Tematy:

face grinding
grinding wheel
steel
vortex air cooling
cooling-lubricant technological fluid

Opis:

In current conditions, great attention is paid to the quality of parts, which is in many ways determined by finishing operations of mechanical treatment, with surface grinding being the most widespread. Grinding process efficiency, abrasive tool wear intensity, machined surface quality and other features of grinding process depend on properties of the environment, where the cutting process takes place. Forced changing of conditions of this environment is one of the ways to control and optimize the grinding process, which can be reached due to finding new technological decisions. One of the most promising directions to solve this problem is the process of face grinding with discontinuous grinding tool and supply of cooling fluid or air in the cutting zone directly. Carried analysis of features of face grinding has shown that heat density can be decreased by the usage by grooved wheels with vortex air cooling or by supply of cooling-lubricant technological fluid. Obtained dependences of temperature field of part surface during grinding establish the influence of the length of working shoulders and grooves, vortex tubes number, outflow rate, temperature and flow rate of cold vortex flow of air. These data provide conscious control over the process of discontinuous face grinding by changing wheel grain size and grinding speed.

Źródło:

Multidisciplinary Aspects of Production Engineering; 2021, 4, 1; 166--177
2545-2827

Pojawia się w:

Multidisciplinary Aspects of Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Tendencje rozwojowe układów chłodzenia silników samochodowych
Development trends of automotive engine cooling systems

Autorzy:

Kneba, Z.

Powiązania:

https://bibliotekanauki.pl/articles/133214.pdf

Data publikacji:

2013

Wydawca:

Polskie Towarzystwo Naukowe Silników Spalinowych

Tematy:

układ chłodzenia silnika
sterowanie układem chłodzenia
engine cooling system
cooling system control

Opis:

Dzięki daleko idącym modyfikacjom układów zasilania i zapłonu silników samochodowych oraz udoskonaleniom układów oczyszczania spalin uzyskano znaczne zmniejszenie emisji związków toksycznych. Układy chłodzenia z pompą cieczy napędzaną mechanicznie stają się archaiczne nie pozwalając na swobodne sterowanie obiegiem cieczy. Również różna wartość temperatury potrzebnej do schładzania różnych procesów wymaga sterowanych zaworów trójdrożnych . Artykuł opisuje sterowanie elektroniczne obecnie wprowadzane do układów chłodzenia.
The far-reaching modifications power systems and ignition automobile engines and aftertreatment improvements achieved significant reduction in toxic emissions. Cooling fluid pump driven mechanically become archaic not allowing the free circulation of fluid control. Also, various temperature levels needed for different cooling processes require controlled three-way valve. The article describes the electronic control currently introduced into the cooling system.

Źródło:

Combustion Engines; 2013, 52, 3; 291-296
2300-9896
2658-1442

Pojawia się w:

Combustion Engines

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Cooling water flow influence on power plant unit performance for various condenser configurations setup

Autorzy:

Dobkiewicz-Wieczorek, Ewa

Powiązania:

https://bibliotekanauki.pl/articles/2091367.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

cooling water
power plant efficiency
cooling water flow control
CHP plant
efficiency

Opis:

This paper presents the influence of cooling water regulation on power plant net efficiency. It was examined whether, for the non-nominal low-pressure turbine load, it is justified to reduce the cooling water pump load, and how it would affect the unit net efficiency. Calculations for two types of power units were carried out: with condensing and extraction-condensing turbine. The tested condensing power plant consists of three surface condensers. The calculation included four condensers’ connections set up on the cooling water side to check how the cooling water system pressure drop affects the net unit performance. The result has confirmed that implementing serial connection decreases net efficiency when cooling water flow regulation is used, but the mixed connection should be applied when pump load is not controlled. It was proved that the cooling water flow control gives a profit for both units. Net efficiency for combined heat and power plant can be improved by 0.1–0.5 pp, the gain is remarkable below 60% of the low-pressure turbine part load. Flow control implementation in the unit with condensing turbine water control gives a similar profit just below 80% of the turbine load. Next, an influence of the additional limitations of a cooling water system (minimal total pump head, cooling tower) affecting the feasibility of implementing the water control has been considered. Applying a multi-cell forced draft cooling tower does not have a significant impact on results, but when a natural draft cooling tower is used, the flow control range is strongly reduced.

Źródło:

Archives of Thermodynamics; 2022, 43, 1; 141--167
1231-0956
2083-6023

Pojawia się w:

Archives of Thermodynamics

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

Determination of effects of outdoor relative humidity of fan pad cooling effects in greenhouses

Autorzy:

Oz, H.
Atilgan, A.

Powiązania:

https://bibliotekanauki.pl/articles/61431.pdf

Data publikacji:

2015

Wydawca:

Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN

Tematy:

cooling efficiency
determination
outdoor relative humidity
fan pad
cooling effect
greenhouse
Isparta province

Źródło:

Infrastruktura i Ekologia Terenów Wiejskich; 2015, III/2
1732-5587

Pojawia się w:

Infrastruktura i Ekologia Terenów Wiejskich

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Analysis of the use of sorption and evaporative cooling as part of the preparation of ventilation air for Polish climatic conditions

Autorzy:

Rzążewski, Mikołaj
Grzebielec, Andrzej

Powiązania:

https://bibliotekanauki.pl/articles/2195739.pdf

Data publikacji:

2021

Wydawca:

Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.

Tematy:

DEC
SDEC
sorption cooling system
evaporative cooling
solar cooling
alternative ways of cooling
ventilation air
thermal comfort
system chłodzenia sorpcyjnego
chłodzenie wyparne
chłodzenie słoneczne
alternatywne sposoby chłodzenia
powietrze wentylacyjne
komfort termiczny

Opis:

In this paper, the possibility of use of a DEC type air conditioning system, using solar energy, in Polish climatic conditions Polish, as an alternative to traditional systems based on compressor refrigeration equipment, was analyzed. At the beginning of the work, attention was paid to how important it is for users to maintain thermal comfort conditions and how these conditions can be determined. It also shows why the DEC system can be a good solution for the cases under consideration. In the next part of the paper, the analyzed system is described, presenting the individual processes of humid air transformation taking place in it, in which devices these processes can take place and how they were modeled in further calculations. Modeling the operation of the DEC system was based mainly on determining the efficiency of individual devices, i.e. the effectiveness of the processes taking place in them and the use of a psychometric graph. Similarly, the method of calculating the useful heat that can be obtained from solar collectors under known conditions is presented. For this purpose, meteorological data and the theory of similarity in heat transfer were used. In the next part of the work, an example of a calculation cycle was presented, along with the next steps of applying to the psychometric graph points corresponding to the states of moist air at individual points of the DEC system. On the basis of such calculation cycles, performed for different values of outdoor air parameters, the relationships of the obtained cooling power, the power supplied for adsorber regeneration, EER, temperature and relative humidity of the supply air to rooms, from the temperature and relative humidity of the outside air. Next, the calculation process for determining the useful heat obtained from solar collectors is presented. On the basis of several such processes, the average conditions of heat collection from the collector were determined, on the basis of which the amount of energy obtained from solar radiation was determined on the scale of the entire summer period. On the basis of this analysis, surpluses and shortages of energy obtained from collectors on individual days of the considered period were determined. In conclusion, it was stated that despite the fairly good cooperation of the system with solar collectors and its simple construction, the DEC system cannot be an alternative to compressor refrigeration equipment. This is mainly due to the unfavorable level of relative humidity in Polish climatic conditions, which does not allow the device to achieve the appropriate temperature of the air supplied to the rooms.

Źródło:

Modern Engineering; 2021, 1; 22--35
2450-5501

Pojawia się w:

Modern Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Thermographic monitoring of the power transformers

Autorzy:

Lisowska-Lis, A.

Powiązania:

https://bibliotekanauki.pl/articles/114168.pdf

Data publikacji:

2017

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

transformer
thermography
diagnostics
monitoring
cooling

Opis:

Results of thermographic monitoring of exemplary power transformers are presented in the paper. Series of thermograms were taken. The areas on the transformer surfaces were analysed for higher temperature in aspects of: the electrical insulation condition of the transformer, the area on the surface, the season of the measurement. The thermograms indicated inefficient cooling for the transformers with deteriorated electrical insulation, especially during the summer season.

Źródło:

Measurement Automation Monitoring; 2017, 63, 4; 154-157
2450-2855

Pojawia się w:

Measurement Automation Monitoring

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Impact of the manufacturing conditions and operating position on heat transport ability of the heat pipe filled with Fluorinert FC-72

Autorzy:

Čaja, A.
Nemec, P.
Mančikova, V.
Malcho, M.

Powiązania:

https://bibliotekanauki.pl/articles/402136.pdf

Data publikacji:

2014

Wydawca:

Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw

Tematy:

heat pipe
heat transport
cooling

Opis:

Heat pipes are devices, which transfer heat at a minimum temperature difference between evaporating and condensing phase. Operating temperature of heat pipe is determined by the working fluid and vacuum achieved during its production. This paper is focused on the determining the effect of the initial temperature of the ambient air to the performance characteristics of produced heat pipes. In general, the decrease in pressure decreases the boiling liquid. Based on this it can be presumed that achieving a lower temperature during production of heat pipe, the lower vacuum, the boiling point of working fluid while increasing ability of heat transport in various positions.

Źródło:

Structure and Environment; 2014, 6, 2; 44-47
2081-1500

Pojawia się w:

Structure and Environment

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Determination of optimum heating and cooling degree-hour values for pepper plant

Autorzy:

Atilgan, A.
Yucel, A.
Tanriverdi, C.
Oz, H.
Tezcan, A.

Powiązania:

https://bibliotekanauki.pl/articles/101263.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN

Tematy:

cooling
degree-hour
heating
Kumluca

Opis:

Information on the energy needs of agricultural production activities carried out in any region can be obtained in advance. Many methods are used for this purpose. One of them is a degree-hour method. Kumluca district of Antalya province where pepper cultivation is done intensively was chosen as a study area. The growers prefer autumn production of pepper plants inside the greenhouses in this region. Production starts in early October and last until June. The long-term (1960-2015) thermometer temperatures in the study area were obtained from the Turkish State Meteorological Service. In this study, by using only meteorological data, during each growing season (planting, flowering, pollination, fruit ripening and harvesting) were obtained degree-hour values for the pepper plant and evaluated with Student-t test. Regression coefficients were obtained by correlating heating and cooling degree-hour values with different temperature values which are recommended during the vegetative growing season for the pepper plant. Regression analysis was performed between obtaining heating and cooling degree-hour values (dependent variable) and annual mean heating and cooling degree hour values (independent variable) which are suggested basic temperature values. In conclusion, the regression coefficients were determined as 0.99 for out of greenhouse heating degree-hour and as 0.90-0.99 for cooling degree-hour, respectively. Heating and cooling-hour values were found between 0.96-0.88 and 0.99-0.87, respectively. It was determined that there are very high correlations in the positive direction. According to different growing seasons of pepper, knowing how much less or more of heating and cooling degree-hour values is needed, one can give information in advance in terms of energy consumption or usage. Areas or regions where less energy is to be used can be determined in terms of agricultural production to be done in any region.

Źródło:

Infrastruktura i Ekologia Terenów Wiejskich; 2017, II/1; 457-467
1732-5587

Pojawia się w:

Infrastruktura i Ekologia Terenów Wiejskich

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Passive energy reduction technologies in environmental engineering
Technologie pasywnego ograniczania zużycia energii w inżynierii środowiska

Autorzy:

Lesiak, P.

Powiązania:

https://bibliotekanauki.pl/articles/402128.pdf

Data publikacji:

2018

Wydawca:

Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw

Tematy:

passive technologies
cooling
cooling coatings
green facades
technologie pasywne
chłodzenie
powłoki chłodzące
zielone fasady

Opis:

The paper presents a review of passive techniques used in environmental engineering and construction, aimed at reducing energy consumption for heating or cooling purposes. These are: green facades, cooling coatings, thermopaints, heater screens, shutters and other solutions. Their disadvantages, advantages and working methods were discussed. The heat gain calculations for the exemplary building whose baffles were painted with pigmented pigment with varying degrees of dilution resulted in a facade of varying color intensity. It has been found that by applying bright colors, nearly 30 percent of energy consumption for cooling purposes for heat gains through opaque seams compared to dark colors has been reduced.
W pracy przedstawiono przegląd technik pasywnych stosowanych w inżynierii środowiska i budownictwie, których zadaniem jest ograniczenie zużycia energii na cele grzewcze lub chłodnicze. Są to: zielone fasady, powłoki chłodzące, termofarby, ekrany zagrzejnikowe, żaluzje oraz inne rozwiązania. Przedyskutowano ich wady, zalety oraz sposób pracy. Przedstawiono również obliczenia zysków ciepła dla przykładowego budynku, którego przegrody zostały pomalowane farbą zabarwioną pigmentem o różnym stopniu rozcieńczenia, czego wynikiem jest fasada o różnej intensywności koloru. Stwierdzono, że przez zastosowanie jasnego koloru doszło do obniżenia o blisko 30 procent zużycia energii na cele chłodnicze dla zysków ciepła przez przegrody nieprzezroczyste w porównaniu z ciemną barwą.

Źródło:

Structure and Environment; 2018, 10, 2; 161-169
2081-1500

Pojawia się w:

Structure and Environment

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Evaporative roof cooling - economy
Dachy z chłodzeniem wyparnym - ekonomia

Autorzy:

Varfalvi, J.
Weeber, I.

Powiązania:

https://bibliotekanauki.pl/articles/2065392.pdf

Data publikacji:

2014

Wydawca:

Politechnika Częstochowska

Tematy:

evaporative cooling
roof cooling systems
ASHRAE
economy
chłodzenie wyparne
ekonomia
system dachowy chłodzenia wyparnego

Opis:

The article presents information on research on evaporative cooling system for large surfaces conducted by the company Öntözés.hu Ltd in cooperation with the Budapest University of Technology and Economics. It enumerates advantages of employing such solutions on roofs.
W artykule przedstawiono informację na temat badań prowadzonych nad wyparnym systemem chłodzenia dla dużych powierzchni przez firmę Öntözés.hu Ltd we współpracy z Uniwersytetem Politechnicznym w Budapeszcie. Omówiono korzyści płynące z zastosowania tego rodzaju rozwiązań na dachach.

Źródło:

Budownictwo o Zoptymalizowanym Potencjale Energetycznym; 2014, 2 (14); 111--116
2299-8535
2544-963X

Pojawia się w:

Budownictwo o Zoptymalizowanym Potencjale Energetycznym

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Cooling of electric machines by multi-phase systems

Autorzy:

Schuffenhauer, U.
Urbański, W.
Michalke, N.
Kuß, H.

Powiązania:

https://bibliotekanauki.pl/articles/1372901.pdf

Data publikacji:

2010

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel

Tematy:

maszyna elektryczna
chłodzenie
electric machines
cooling

Opis:

A high potential for increase the power density and the efficiency of electrical machines consists in a improved cooling. A new implementation approach is in the pouring of the electric components into a medium, which guarantees a better heat emission to the case in a combined manner with a new cooling concept by utilization of change its phase, with that maximum loads can be absorbed thermally. At a realistic experimental model on the basis of a 3 kW induction motor of assembly line production the use of the different physical effects during heat storage was examined for the suitability for an electrical machine, when this equipped with chambers with technical paraffin were. There are represented the experimental investigations at a modified induction motor and with its result the potential of this development. Measurement and computations show the better cooling of the solid one and both the liquefied material compared to air circulation. On the other hand, the effect of the fusion heat is still insufficient because of bad heat conduction qualities of PCM material for the practical application. By means of thermal FEM simulations the experiments are supported and possibilities for new materials examined.

Źródło:

Maszyny Elektryczne: zeszyty problemowe; 2010, 88; 97-102
0239-3646
2084-5618

Pojawia się w:

Maszyny Elektryczne: zeszyty problemowe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Numerical simulation of heat loaded aircraft engine turbine blade - internal cooling

Autorzy:

Świątek, M.
Domański, R.

Powiązania:

https://bibliotekanauki.pl/articles/242988.pdf

Data publikacji:

2012

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

CFD
internal cooling systems
thermal protection

Opis:

The objective of this thesis was to show present the impact of the turbine blade cooling on blade material temperatures well as familiarize with processes and methods of numerical simulation by designing airfoil internal cooling system. The model of airfoil was created based on drawing print nr 17.41.0114 of engine Tumański R-11F2S-300. Geometry of all models described above is created using SIMENS NX4 program based on drawings obtained from available literature, and data acquired from the Internet. The discretization into a structural finite volume grid took place in commercial pre-processor GAMBIT registered trademark (GAMBIT and FLUENT – commercial CFD codes from Ansys Inc.). Conjugated heat transfer analysis was conducted in program FLUENTregistered trademark for four different cases, where the blade material properties were changed. The goal of this thesis was to obtain temperature fields and distribution in the turbine blade airfoil and to evaluate if applied cooling would be able to cool down this thermally loaded part. Calculated results show that proposed blade heat protection method is insufficient during steady state condition, mainly on the blade leading and trailing edge. In these two locations, the blade is overheated, and the high temperature level of applied material is unacceptable for used in jet engine turbine industry.

Źródło:

Journal of KONES; 2012, 19, 4; 601-606
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Influence of speed and load on the engine temperature at an elevated temperature cooling fluid

Autorzy:

Krakowski, R.

Powiązania:

https://bibliotekanauki.pl/articles/243666.pdf

Data publikacji:

2013

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

combustion engines
cooling system
coolant temperature

Opis:

In this article has been found that the most popular and widely used method of cooling is liquid cooling, which ensures uniformity of temperature around the combustion chamber and easy acquisition and transfer of heat, although the properties of water are limited by maximum temperature of the coolant. Preliminary scientific research of such a system indicates the possibility of increasing overall efficiency and reducing toxic components in exhaust gases at low engine loads when the engine exhaust temperature of the classic system is too low for efficient catalytic action. This paper presents the dynamometer test stand designed and built using original components of diesel engine 4CT90 production of WSW "ANDORIA" SA. Presented system was designed for the four cylinder with indirect fuel injection system. Research was made on the engine dynamometer stand, which was equipped with standard measure devices (measures: speed, torque, temperatures, flows) and exhaust gas analysers. The temperature of this liquid was increased to the higher level than temperature of boiling water in normal conditions. Overpressure inside the cooling system was limited to 0.3 MPa, the temperature inside the cooling system was increased to 115–120°C. During the test, the cooling system was filled with coolant at 90%. The selected results of investigations of the cooling system for the combustion engine working with higher temperature of the cooling liquid, where the influence of speed and load on the engine temperature were presented.

Źródło:

Journal of KONES; 2013, 20, 4; 185-192
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

New Technological Concept for Thermal Spray Protective Coatings

Autorzy:

Szczucka-Lasota, B.
Piwnik, J.

Powiązania:

https://bibliotekanauki.pl/articles/353107.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

cooling system
micro-injector
technological concept

Opis:

Thermally spraying with micro-jet cooling is an innovate technology. It is possible to get fine dispersive structure of coatings during the shorter time in comparable to the classical high velocity oxygen fuel process (HVOF). It corresponds with good corrosion-erosion properties of structure. In the paper the parameters of the spraying with micro-jet cooling process are presented. The selected properties of coatings obtained by hybrid method are presented. The results of wear tests for hybrid and HVOF coating are compared. Results of investigation are very optimistic. The presented technology should be adapted to the actual production of protective coating for machines and construction working in wear conditions.

Źródło:

Archives of Metallurgy and Materials; 2017, 62, 3; 1499-1504
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Pressure agglomeration of plant materials - technological and technical innovations. Part 3. A new solution for the stabilizing and cooling track for briquettes
Ciśnieniowa aglomeracja materiałów roślinnych - innowacje technologiczno-techniczne. Cz. 3. Nowe rozwiązanie toru stabilizująco-chłodzącego dla brykietów

Autorzy:

Obidziński, S.
Hejft, R.
Wszeborowski, D.

Powiązania:

https://bibliotekanauki.pl/articles/337335.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych

Tematy:

briquetting
cooling
stabilizing and cooling track
water jacket
brykietowanie
chłodzenie
tor stabilizująco-chłodzący
płaszcz wodny

Opis:

This paper presents a new prototype solution for the stabilizing and cooling track for briquettes from plant materials that enables a more intensive process of briquette cooling; at the same time, its design does not differ significantly from the existing ones. As a cooling factor, the designed stabilizing and cooling track uses, in addition to air, water flowing in the water jackets that surround the briquette. In the track’s design, a system of briquette press by means of a movable upper jacket equipped with a lever pressure system was used. Owing to the use of a counter-flowing cooling medium (water), the track’s construction allows to obtain good cooling conditions and does not cause briquette damage.
W pracy przedstawiono nowe prototypowe rozwiązanie toru stabilizująco-chłodzącego dla brykietów z materiałów roślinnych, który pozwala na bardziej intensywny proces chłodzenia brykietu, a jednocześnie jego konstrukcja nie odbiega znacząco od istniejących konstrukcji. Zaprojektowany tor stabilizująco- chłodzący jako czynnik chłodniczy, oprócz powietrza, wykorzystuje wodę płynącą w płaszczach wodnych, okalających brykiet. W konstrukcji toru uwzględniono system docisku brykietu za pomocą ruchomego płaszcza górnego, wyposażonego w dźwigniowy system docisku. Dzięki zastosowaniu przeciwprądowego przepływu czynnika chłodzącego (wody), zaprojektowany tor pozwala na osiągnięcie dobrych warunków chłodzenia i nie doprowadza do uszkadzania brykietu.

Źródło:

Journal of Research and Applications in Agricultural Engineering; 2016, 61, 1; 56-60
1642-686X
2719-423X

Pojawia się w:

Journal of Research and Applications in Agricultural Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Novel Modeling of the Phenomenon of Air-Cooled Solid

Autorzy:

Pluta, Z.
Hryniewicz, T.

Powiązania:

https://bibliotekanauki.pl/articles/411916.pdf

Data publikacji:

2013

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

phenomenon of body cooling
thermal space-time
potential field
time constant
cooling rate
temperature
time

Opis:

The paper turns the attention to the thermal problems of the solid cooling in air. The physical aspect of mathematic approach has been underlined. The analysis and critical evaluation of Newton's Law concerning the solid air-cooling have been performed. The cognitive path leading to the solution is presented with the result being the body temperature dependence on time of cooling down in the air. Then the course of solution concerning the result of the adequate dependence of temperature of the cooled body on time has been presented. In the study, the stress is put on constant magnitudes chich characterize the susceptibility of solid to the cooling in the air. In the end, the synthetic formulation of all functional characteristics of the thermal phenomenon discussed in the paper, have been presented.

Źródło:

International Letters of Chemistry, Physics and Astronomy; 2013, 1; 1-16
2299-3843

Pojawia się w:

International Letters of Chemistry, Physics and Astronomy

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

PV panel cooling using stack effect
Chłodzenie paneli fotowoltaicznych z wykorzystaniem efektu stosu

Autorzy:

Rao, Kudithi Nageswara
Ganesamoorthy, Rajkumar

Powiązania:

https://bibliotekanauki.pl/articles/27315443.pdf

Data publikacji:

2023

Wydawca:

Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej

Tematy:

air cooling
convection
solar-cell cooling
solar photovoltaic
chłodzenie powietrzem
konwekcja
chłodzenie ogniwami słonecznymi
fotowoltaika

Opis:

Unsatisfactory feat of the photo-voltaic cell is solitary in every of the foremost issues among the promotion of PV technology. A vital strand changing cell performance is operative temperature of the cell. The voltage of the cell, declines near directly with a rise in the operative temperature of the photo-voltaic cell. The temperature condition on the in-operative surface of a photo-voltaic panel remains usually 22–30°C beyond the normal temperature conditions. Upon the premise concerning those issues, the potency of the photo-voltaic cell will be refined by sustaining their operative temperatures as low as possible. This paper portrays a technique of PV/solar panel cooling using convection generated by the chimney effect. This paper considers the diminution of warmth from the Photo-voltaic panel for both active and inactive conditions.
Niezadowalająca wydajność ogniwa fotowoltaicznego jest jednym z najważniejszych problemów związanych z promocją technologii PV. Istotnym czynnikiem wpływającym na wydajność ogniwa jest jego temperatura robocza. Napięcie ogniwa spada niemal bezpośrednio wraz ze wzrostem temperatury roboczej ogniwa fotowoltaicznego. Temperatura na powierzchni działającego panelu fotowoltaicznego pozostaje zwykle o 22–30°C wyższa od normalnych warunków temperaturowych. Zgodnie z założeniami dotyczącymi tych kwestii, moc ogniwa fotowoltaicznego zostanie poprawiona poprzez utrzymanie ich temperatury roboczej na jak najniższym poziomie. Niniejszy artykuł przedstawia technikę chłodzenia paneli fotowoltaicznych/solarnych z wykorzystaniem konwekcji generowanej przez efekt kominowy. W artykule uwzględniono zmniejszenie ciepła z panelu fotowoltaicznego zarówno w warunkach aktywnych, jak i nieaktywnych.

Źródło:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2023, 13, 3; 83--85
2083-0157
2391-6761

Pojawia się w:

Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Zastosowanie CO2 jako chłodziwa w procesie toczenia
Using CO2 as a coolant in turning process

Autorzy:

Żyłka, Ł.
Babiarz, R.
Płodzień, M.
Sułkowicz, P.
Pasierb, M.

Powiązania:

https://bibliotekanauki.pl/articles/195946.pdf

Data publikacji:

2017

Wydawca:

Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza

Tematy:

toczenie
chłodzenie
CO2
turning
cooling

Opis:

Zastosowanie chłodziwa w procesach obróbkowych ma istotne znaczenie dla przebiegu i wyniku procesu skrawania. Jedną z podstawowych funkcji, jakie spełniają chłodziwa w procesie skrawania, jest redukcja temperatury w strefie skrawania, a przez to m.in. zwiększenie trwałości narzędzia. Z uwagi na uciążliwość dla środowiska naturalnego chłodziw na bazie olejów oraz ograniczone zdolności przejmowania ciepła skrawania stale poszukuje się innych, proekologicznych mediów chłodzących, głównie w postaci gazowej. W związku z tym w artykule przedstawiono wyniki badań zastosowania ciekłego CO2 jako chłodziwa w procesie toczenia stali. Mierzono składowe siły skrawania oraz temperaturę w strefie skrawania. Porównano proces chłodzenia CO2 z obróbką na sucho i z zastosowaniem sprężonego powietrza. W wyniku zastosowania ciekłego CO2 jako chłodziwa uzyskano znaczącą redukcję temperatury oraz składowych siły skrawania.
The use of coolant in machining processes is very important for the cutting process and its result. One of the basic functions that coolant perform in the cutting process is the reduction of the temperature in the cutting zone and increasing of tool life. Due to the fact that oil-based coolants are burdensome for the environment and have limited heat transfer capabilities, other pro-ecological cooling fluids are constantly looking for, mainly gases. Taking this into account, the results of studies on the use of CO2 liquid as a coolant in the steel turning process are presented in this paper. Components of the cutting force and the temperature in the cutting zone were measured. Turning processes with the use of the CO2, compressed air and without coolant were compared. As a result of the use of liquid CO2 as a coolant, a significant reduction in temperature and component cutting forces has been achieved.

Źródło:

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika; 2017, z. 89 [295], 3; 401-408
0209-2689
2300-5211

Pojawia się w:

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Experimental and theoretical study of surface cooling using a single microjet

Autorzy:

Mikielewicz, D.
Muszyński, T.

Powiązania:

https://bibliotekanauki.pl/articles/175373.pdf

Data publikacji:

2010

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

surface cooling
microjets
heat transfer intensification

Opis:

The experimental research of heat transfer due to impingement of a single microjet of water and air has been studied on a specially designed rig. Systematic data on radial wall temperature distribution were collected, which enabled development of empirical correlation for heat transfer coefficient applicable both for air and water flows. Two microjet nozzle diameters were studied, i.e. 180 and 260 ěm. The correlation describing the heat transfer coefficient was later used in validation of a model of a single microjet impinging on a flat plate, developed earlier by the authors. Such analytical model of microjet is of a great value in future analysis as it enables to carry out for example sensitivity tests or to appropriately select operational parameters. The presented model is quite general and its further modifications are possible when some of the imposed assumptions are relaxed. More experiments on the structure of a single microjet are needed which will confirm the correlation presented in the paper.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2010, 122; 95-110
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Ocena montażu i eksploatacji urządzeń do schładzania mleka
Assessment of installation and operation of milk cooling equipment

Autorzy:

Daniel, Z.

Powiązania:

https://bibliotekanauki.pl/articles/288605.pdf

Data publikacji:

2010

Wydawca:

Polskie Towarzystwo Inżynierii Rolniczej

Tematy:

mleko
schładzanie
eksploatacja
milk
cooling
operation

Opis:

Badania przeprowadzono na terenie powiatu nowosądeckiego. Metodą wywiadu kierowanego przebadano 47 gospodarstw użytkujących schładzalniki typu konwiowego, oraz zbiornikowego /nurnikowe i zbiornikowe typu otwartego/. Producenci mleka dokonali oceny stanu technicznego użytkowanych schładzalników - ocenę bardzo dobrą uzyskało 46,8% schładzalników pozostałe ocenę dobrą. Najczęściej występującą awarią było zepsucie się systemu mieszania, następnie uszkodzenie agregatu, termostatu i rozszczelnienie instalacji gazowej. Podczas badań przeprowadzono także kontrolę powierzchni i sposobu wentylacji pomieszczenia w którym zamontowane były urządzenia. Wszystkie badane gospodarstwa spełniały wymogi wielkości powierzchni, natomiast system wentylacji pomieszczeń realizowany był najczęściej przez zastosowanie uchylnych okien. W gospodarstwach schładzalniki myte są ręcznie, za pomocą myjek i szczotek. 83% producentów mleka używa środków myjąco-dezynfekujących, natomiast 17% rolników używa tylko czystej ciepłej wody. Badane gospodarstwa posiadają wystarczające środki techniczne do prawidłowego schładzania mleka.
The research was carried out in the area of Nowy Sącz administrative district. 47 farms using can and tank (plunger and open tank) type coolers were examined using the directed interview method. Milk manufacturers assessed technical state of operated coolers - 46.8% coolers were graded as very good, the - other as good. Mixing system failure was the most frequent defect, then refrigerating unit and thermostat failure, and gas system unsealing. Moreover, the research involved check of area and ventilation method used in a room containing the equipment. All the examined farms met the requirements regarding area size, and room ventilation system was most often based on installation of horizontal pivoting windows. In the farms, coolers are washed by hands, using wash cloths and brushes. 83% of milk manufacturers use washing agents and disinfectants, while 17% of farmers use only pure warm water. The examined farms possess technical equipment sufficient for proper milk cooling.

Źródło:

Inżynieria Rolnicza; 2010, R. 14, nr 1, 1; 145-150
1429-7264

Pojawia się w:

Inżynieria Rolnicza

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Cooling of removable battery pack in the electric car

Autorzy:

Mitianiec, W.

Powiązania:

https://bibliotekanauki.pl/articles/241767.pdf

Data publikacji:

2013

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

transport
electric cars
battery
cooling system

Opis:

The thermal management system is the one most important unit in the electric car which controls temperature of electric devices by obtaining a stability of their operation in different load and ambient conditions. For the other side the removable pack installed in the closed cradle for easier service during exchange of the modules should be cooled by the air. It is also better for safety during exploitation for the vehicle parts and people. The paper presents the proposal of ventilation of battery packs, assumptions of the battery pack cooling system, mathematical model of heat exchange and graphical results obtained from simulation carried out using the CFD program. During modelling it took into account two models: two-dimensional and three-dimensional for evaluation of the air flow and cooling rate of the battery modules. It was assumed four modules in one row of the cradle with total electric capacity above 4 kWh. The paper shows geometry of the whole battery unit with ventilation passages in 3D configuration. The aim of the work was determination of thermal parameters of the battery modules cooled by the air flow in the close chamber. The proposed cooling model of the cradle with air flow caused by fans in the pipe inlet shows that it is not possible to decrease temperature in the same way of each battery modules.

Źródło:

Journal of KONES; 2013, 20, 2; 277-284
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Improvement of grinding technology with vortex cooling of steels that are liable to crack propagation

Autorzy:

Ivanova, Tatiana Nikolaevna
Biały, Witold
Nordin, Victor

Powiązania:

https://bibliotekanauki.pl/articles/2064897.pdf

Data publikacji:

2019

Wydawca:

STE GROUP

Tematy:

steel
grinding
temperature
vortex cooling
wheel

Opis:

Complexity of grinding process and phenomena entailing it not always allow reaching required technological results, especially while machining surfaces of parts made of tough-to-machine steels, which are liable to crack propagation. Cracks can occur in these parts during grinding due to considerable temperature difference along the section, which can cause formation of high temporary internal tensile stress. Application of cooled air in grinding process exerts considerable influence over temperature decrease in cutting area. In addition, it depends not only on heat exchange, but also on properties of cold air flow. The greatest effect of temperature decrease can be reached by injection of cold air flow in cutting area with implementation of vortex effect, which occurs in swirl flow of compressed air originating in vortex tube. The study of heat generation during machining by tools with discontinuous cutting surface and vortex air cooling was carried out. Obtained thermophysical parameters of vortex air cooling (increase in speed of stream flowing, expansion degree, share of cold stream and decrease in humidity of air stream) allow reducing heat density due to growth of cooling effect in grinding zone. On the base of experimental studies we developed recommendations for choice of optimal grinding modes by tool with discontinuous cutting surface and vortex air cooling of flat parts made of steels being liable to cracking.

Źródło:

Multidisciplinary Aspects of Production Engineering; 2019, 2, 1; 9--23
2545-2827

Pojawia się w:

Multidisciplinary Aspects of Production Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Influence of the depth of the frame on room energy balance according to energy consumption

Autorzy:

Sas, S.
Kasprzyk, P.

Powiązania:

https://bibliotekanauki.pl/articles/89142.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa

Tematy:

heat increment
cooling capacity
solar radiation

Opis:

The article discusses the impact of the size of the shading caused by natural obstacles as the depth of the frame on the heat balance of the room, thus the selection and size of air conditioning equipment. Taking into account this phenomenon on the design stage, we are able to avoid wrong device selection, and thus reduce cost of whole installation. A thorough analysis of the affection of shading in passive construction through the use of shading elements, is an opportunity to reduce the flow of solar energy in the summer and thereby improve the energy consumption of the building.

Źródło:

Mining Science; 2015, 22, Special Issue 2; 139-150
2300-9586
2353-5423

Pojawia się w:

Mining Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Hybrid Modelling of Machine Tool with Integrated Cooling System

Autorzy:

Bukowski, A.
Grochowski, M.
Jedrzejewski, J.

Powiązania:

https://bibliotekanauki.pl/articles/971101.pdf

Data publikacji:

2008

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

mechatronic model
machine tool
cooling system

Opis:

In this paper, a method of hybrid modelling of machine's mechanic structure together with mechatronic cooling system of its body is presented. In this method, a FEM model, traditionally used for thermal analyses of machine's thermal behaviour, has been integrated with mechatronic model of cooling system, implemented in MATLAB. In such way, a hybrid model has been created, allowing to simulate the control of machine body cooling process. Applied simulation of cooling the region of body, adjacent to the guide, illustrates the possibility of controlling the temperature in chosen points of the machine tool, in transient state, which would ensure minimal body deformations, small enough not to require compensation, which is generally hard and of limited precision. Thermal model of machine tool has been built with the use of SATO system [1]. In this work, time-domain temperature changes with and without the use of regulation by means of PID regulator have been compared. Results of the simulation show the usefulness of presented hybrid modelling method for the improvement of machine tool thermal behaviour.

Źródło:

Journal of Machine Engineering; 2008, 8, 1; 84-93
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Assesment of Passive Cooling in Residential Application under Moderate Climate Conditions
Ocena możliwości stosowania pasywnego chłodzenia do celów domowych w klimacie umiarkowanym

Autorzy:

Petela, K.
Szlęk, A.

Powiązania:

https://bibliotekanauki.pl/articles/389072.pdf

Data publikacji:

2016

Wydawca:

Towarzystwo Chemii i Inżynierii Ekologicznej

Tematy:

passive cooling
nocturnal sky
solar collector
residential cooling
chłodzenie pasywne
nocny nieboskłon
kolektor słoneczny
chłodzenie radiacyjne

Opis:

In the face of environmental regulations, renewable energy systems are anticipated to become more attractive. Passive buildings may appear promising in terms of energy saving. The aim of the work is an investigation of energy effects of using radiative passive cooling. System analysed here bases on the radiative heat exchange with nocturnal sky. On every exposed surface, beyond the convection mechanism, a radiative heat exchange with the sky takes place. Analysis shows that passive cooling has a potential in cold production, however is sensitive to ambient conditions and that cold supply is inversely proportional to demands. Small value of average heat loss from the radiator makes the system independently unable to fulfil cooling demand, however may become an attractive, eco-friendly supplement to a conventional air-conditioner.
Wobec wymagań środowiskowych systemy wykorzystujące odnawialne źródła energii są coraz częściej stosowane i wdrażane również do rozwiązań budownictwa pasywnego. Celem pracy jest analiza efektów energetycznych wykorzystania pasywnego chłodzenia w budynku mieszkalnym. Podmiotem pracy jest system opierający swoje działanie na promienistej wymianie ciepła z nocnym nieboskłonem. Na powierzchni każdego ciała wyeksponowanej ku niebu, oprócz konwekcyjnej wymiany ciepła, odbywa się również radiacyjna wymiana ciepła z nieboskłonem. Analiza ukazuje potencjał chłodzenia pasywnego tego typu w produkcji chłodu, jednakże wskazuje na silną zależność systemu od warunków otoczenia oraz na fakt, że podaż chłodu jest odwrotnie proporcjonalna do zapotrzebowania. Niskie wartości strumieni strat ciepła z pasywnego radiatora sprawiają, że system nie może stanowić samodzielnego źródła produkcji chłodu, jednak może stać się atrakcyjnym, przyjaznym środowisku dodatkiem do konwencjonalnego układu klimatyzacyjnego.

Źródło:

Ecological Chemistry and Engineering. A; 2016, 23, 2; 211-225
1898-6188
2084-4530

Pojawia się w:

Ecological Chemistry and Engineering. A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Zarządzanie temperaturą w bateriach samochodów elektrycznych – przegląd systemów chłodzenia
Temperature management in electric car batteries – review of cooling systems

Autorzy:

Skibińska, Agnieszka
Stępień, Zbigniew
Żółty, Magdalena

Powiązania:

https://bibliotekanauki.pl/articles/2143338.pdf

Data publikacji:

2022

Wydawca:

Instytut Nafty i Gazu - Państwowy Instytut Badawczy

Tematy:

zarządzanie temperaturą
samochody elektryczne
systemy chłodzenia
ciecze chłodzące
temperature management
electric cars
cooling systems
cooling liquids

Opis:

Polska jest jednym z największych rynków samochodów osobowych w Europie pod względem sprzedaży, zajmując szóste miejsce wśród krajów Unii Europejskiej i Europejskiego Stowarzyszenia Wolnego Handlu. Chociaż we flocie samochodów osobowych w Polsce dominują obecnie samochody z silnikami spalinowymi, kraj jest zaangażowany w zwiększanie liczby i udziału elektrycznych samochodów osobowych. Prawie 12 300 elektrycznych samochodów osobowych jeździło po polskich drogach do czerwca 2020 r. Ponad 56% z nich stanowiły pojazdy elektryczne na baterie (BEV). W niniejszym artykule zebrano informacje dotyczące stosowanych w samochodach elektrycznych systemów zarządzania temperaturą baterii. Przedstawiono sposoby chłodzenia z wykorzystaniem powietrza, czynnika chłodniczego, różnego rodzaju cieczy, materiałów o przemianie fazowej oraz systemu opartego na rurkach cieplnych, a także z zastosowaniem elementu termoelektrycznego. W czasie eksploatacji pojazdów BEV należy zwrócić szczególną uwagę na systemy zarządzania temperaturą baterii. Temperatura baterii wywiera różnorodny wpływ na działanie układu elektrochemicznego, co przekłada się na moc i efektywność energetyczną, bezpieczeństwo i niezawodność oraz koszt i okres użytkowania. W celu zapewnienia długiej żywotności i optymalnej wydajności baterii litowo-jonowych, należy zadbać o optymalny zakres temperatur oraz jednolity rozkład temperatury w pakiecie baterii i ogniwach.
Poland is one of the largest passenger car markets in Europe in terms of sales, ranking sixth place among the countries of the European Union and the European Free Trade Association. Although the passenger car fleet in Poland is currently dominated by cars with internal combustion engines, the country is committed to increasing the number and share of electric passenger cars. Almost 12 300 electric passenger cars were on Polish roads until June 2020. Over 56% of them were battery electric vehicles (BEV). This article gathers information on the temperature management systems used in electric cars. Cooling methods with the use of air, refrigerant, various types of liquids, materials with phase change and a system based on heat pipes as well as the use of a thermoelectric element were presented. When operating BEVs, particular attention should be paid to battery temperature management systems. Battery temperature has a variety of effects on the operation of the electrochemical system, which translates into power and energy efficiency, safety and reliability, cost and lifetime. In order to ensure the long life and optimal performance of lithium-ion batteries, care should be taken to ensure the optimal temperature range and uniform temperature distribution in the battery pack and cells.

Źródło:

Nafta-Gaz; 2022, 78, 3; 240-247
0867-8871

Pojawia się w:

Nafta-Gaz

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Analiza obciążeń cieplnych podczas rozruchu nadkrytycznych turbin parowych z chłodzeniem zewnętrznym
Analysis of thermal loads during start-up in supercritical steam turbines with external cooling

Autorzy:

Kosman, W.

Powiązania:

https://bibliotekanauki.pl/articles/173013.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

obciążenie cieplne
turbina parowa
chłodzenie zewnętrzne
system chłodzenia
thermal load
steam turbine
external cooling
cooling system

Opis:

Rozruch turbiny parowej wiąże się ze wzrostem obciążeń cieplnych, tym większym, im wyższa jest temperatura czynnika roboczego. Wysokie temperatury wymusiły zastosowanie w turbinach systemów chłodzenia, których zadaniem jest niedopuszczenie do nadmiernego nagrzewania elementów maszyny. Rozpatrywane jest zagadnienie działania systemu chłodzenia podczas rozruchu. Wprowadzenie dodatkowego strumienia zmienia warunki wymiany ciepła na powierzchni chłodzonych elementów i prowadzi do uzyskania pola temperatury innego, niż w turbinie bez chłodzenia. W pracy przedstawiono wyniki badań umożliwiające ocenę stanu cieplnego i wytrzymałościowego głównych elementów turbiny.
Start-up of a steam turbine incurres in high thermal loads. Their level is proportional to the level of the live steam temperature. High level of the temperature demands application of cooling systems to protect the turbine against overheating. The problem under the analysis here is focused on the operation of the cooling system during start-up. The presence of an additional steam flow changes the conditions of heat transfer at the surfaces of the components and causes the temperature field different from the one found in the uncooled turbine. The paper presents the research that aims to evaluate the thermal and strength state of the main components of a supercritical steam turbine.

Źródło:

Archiwum Energetyki; 2013, 43, 1/2; 147-155
0066-684X

Pojawia się w:

Archiwum Energetyki

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Influence of forced cooling of the frictional elemets of the disk brake on the braking efficiency
Ehksperimental'noje issledovane vlijanja prinuditel'nogo okhlazhdenja frikcionnykh elementov diskovogo tormoza na ehffektivnost' tormozhenja

Autorzy:

Osenin, Y.I.
Sosnov, I.
Sergienko, O.
Biloborodova, I.

Powiązania:

https://bibliotekanauki.pl/articles/791872.pdf

Data publikacji:

2011

Wydawca:

Komisja Motoryzacji i Energetyki Rolnictwa

Tematy:

braking efficiency
friction element
disk brake
mechanical braking
friction coefficient
cooling system
liquid-air cooling system

Źródło:

Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11
1641-7739

Pojawia się w:

Teka Komisji Motoryzacji i Energetyki Rolnictwa

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

The Complex Computer System Based on Cellular Automata Method Designed to Support Modelling of Laminar Cooling Processes

Autorzy:

Gołąb, R.
Madej, Ł.
Pietrzyk, M.

Powiązania:

https://bibliotekanauki.pl/articles/100057.pdf

Data publikacji:

2014

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

cellular automata
finite element method
cooling process

Opis:

The user friendly computer system that have the capability of modelling material behaviour both at the macro and micro scales was developed in this work. The system was designed to predict microstructure evolution during phase transformation in laminar cooling conditions with the use of the multi scale cellular automata finite element (CAFE) model. The finite element (FE) part is based on the conventional Fourier type equation and is used to predict macroscopic temperature distribution. This is an input for the micro scale cellular automata (CA) model of austenite-ferrite phase transformation. To facilitate the research, proposed micro scale CA model was implemented within developed universal object-oriented programming framework CAF. Description of major assumptions and functionality of the developed numerical system including efficient Graphical User Interface (GUI) is presented in the paper. The intuitive visualization of data obtained in different length scales facilitates work with the software.

Źródło:

Journal of Machine Engineering; 2014, 14, 1; 63-73
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Decreasing of thermal errors in a lathe by forced cooling of ball screws and a headstock

Autorzy:

Winiarski, Z.
Kowal, Z.
Błażejewski, A.

Powiązania:

https://bibliotekanauki.pl/articles/1429161.pdf

Data publikacji:

2008

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

lathe
feed mechanism
cooling
thermal error
calculation

Opis:

The goal of this paper is to present the effective methods of decreasing thermal deformations of a turning centre's structure in order to reduce the thermal error. The design of a machine tool as well as the scope of analyses are described, and calculation methods are specified. The paper also presents the results of computer simulations, concerning studies on the influence of type and parameters of a headstock-cooling liquid on the reduction of spindle displacements. Moreover, the results of feed mechanism's thermal studies are shown, describing the influence of heat generated during the operation of ball screws and their inner liquid cooling, on tool's thermal displacements.

Źródło:

Journal of Machine Engineering; 2008, 8, 4; 122-130
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

The analysis of environmental and human impacts of using Strong Alkaline Water for cooling during machining

Autorzy:

Da Silva, P.
Tanabe, I.
Junior, D. C. R.
Takahashi, S.

Powiązania:

https://bibliotekanauki.pl/articles/99481.pdf

Data publikacji:

2018

Wydawca:

Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych

Tematy:

eco-friendly
strong alkaline water
emission
cooling

Opis:

An eco-friendly manufacturing approach is important for the environment. Enhancing machining performances is not only required to improve product’s quality, time saving, and reduces costs; it is also contributed to the environmental protection efforts. Cooling is important aspect for obtaining this purpose. Therefore the benefits of Strong Alkaline Water (SAW) cooling method was assessed and compared with conventional wet cutting method. An experiment was performed at Nagaoka University of Technology machining centre. Three machine tools including a milling machine, a drilling machine and a turning machine were used. The study shows that using SAW for cooling is far more efficient than conventional cooling method. It reduces annual global warming potential by 72.95%, acidification potential 98.18%, ozone depletion potential 99.6%, smog formation potential 85.71% and human toxicity potential 42.86% compare with conventional method. The study concludes that besides inhibiting corrosion, prolonging tool life, improving surface roughness of final cutting and reducing energy usage, strong alkaline water cooling is an environmentally friendly approach and has positive impact on human health.

Źródło:

Journal of Machine Engineering; 2018, 18, 1; 45-60
1895-7595
2391-8071

Pojawia się w:

Journal of Machine Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Adsorpcja wody na silikażelu w adsorpcyjnych urządzeniach chłodniczych
Water adsorption on silica gel in adsorption chillers

Autorzy:

Gwadera, M.

Powiązania:

https://bibliotekanauki.pl/articles/2072477.pdf

Data publikacji:

2013

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

chłodzenie adsorpcyjne
silikażel
adsorption cooling
silica gel

Opis:

Sprawność chłodziarek adsorpcyjnych wykorzystujących układ silikażel- woda można zwiększyć m.in. zmniejszając opór cieplny na granicy złoże adsorbentu/rurki wymiennika ciepła. W pracy przedstawiono wyniki pomiarów podstawowych wielkości wpływających na zdolność adsorpcyjną silikażelu w stanie ziarnistym i po naniesieniu na powierzchnię metalu. Nie stwierdzono istotnego pogorszenia zdolności adsorpcyjnej w wyniku naniesienia ziaren przy użyciu spoiw opartych na alkoholu poliwinylowym.
Efficiency of silica gel-water adsorption chillers can be increased by the reduction of thermal resistance between an adsorbent bed and heat exchanger tubes. Measurement results of quantities influencing the adsorption capacity of silica gel in a granular form and after consolidation with a metal surface were presented. Significant deterioration of adsorption capacity resulting from pellets’ consolidation with a metal surface with the use of polyvinyl alcohol solutions was not noticed.

Źródło:

Inżynieria i Aparatura Chemiczna; 2013, 4; 317--318
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Adsorption cooling as a promising method of waste heat utilization in ship technology

Autorzy:

Szymański, P.

Powiązania:

https://bibliotekanauki.pl/articles/2073643.pdf

Data publikacji:

2016

Wydawca:

Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa

Tematy:

adsorption cooling
adsorpcyjny układ chłodniczny
utylizacja odpadów

Opis:

This paper presents the possibility of practical use of the adsorption cooling method in the shipbuilding technology allowing for the conversion of low temperature waste heat (at approx. 60°C) coming from e.g. main engine cooling water. This work describes the construction and operation of such a device, the characteristics of typical adsorbent-adsorbate combinations, the advantages of such solution and the mathematical model.

Źródło:

Journal of Polish CIMEEAC; 2016, 11, 1; 183--188
1231-3998

Pojawia się w:

Journal of Polish CIMEEAC

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Próba zastosowania nanocząstek srebra do kondycjonowania wody obiegowej w chłodni kominowej
Use of nanosilver for water conditioning in cooling tower circulation system

Autorzy:

Kłosok-Bazan, I.

Powiązania:

https://bibliotekanauki.pl/articles/237628.pdf

Data publikacji:

2014

Wydawca:

Polskie Zrzeszenie Inżynierów i Techników Sanitarnych

Tematy:

biofilm
chłodnie kominowe
dezynfekcja
disinfection
cooling towers

Opis:

W badaniach laboratoryjnych wykazano przydatność preparatu biobójczego, zawierającego nanocząstki srebra (≤20 nm) osadzone na krzemionce, do kondycjonowania wody obiegowej w układach chłodniczych. Skuteczność tego procesu była zróżnicowana i zależała od badanej grupy bakterii wskaźnikowych, natomiast nie zależała od zastosowanej dawki preparatu (w zakresie dawek 0,5÷1,5 g/m³). Środek biobójczy, którego receptura jest w trakcie uzyskania ochrony patentowej, dawkowano do wody pobranej z obiegu chłodzącego chłodni kominowej w Elektrowni Łaziska, zasilanego z ujęcia wody powierzchniowej. Wykazano, że preparat biobójczy skutecznie oddziaływał na bakterie Escherichia coli, a także na bakterie mezofilne i psychrofilne, wykazując największą skuteczność w dezaktywacji bakterii E. coli (dawka 0,5 g/m³ – 100%). Badania wykazały większą skuteczność preparatu w dezaktywacji bakterii mezofilnych niż psychrofilnych, przy czym różnica nie przekraczała 10%. Uzyskane wyniki stanowią podstawę do dalszych badań nad wyznaczeniem skutecznej dawki preparatu zawierającego nanocząstki srebra, zapewniającej ograniczenie rozwoju bakterii i powstawania biofilmu w urządzeniach chłodniczych.
Biocide product containing silver nanoparticles (≤ 20 nm) immobilized on silica was demonstrated as a useful tool for water conditioning in cooling circulation systems. The process efficacy varied depending on the indicator bacteria tested. However, it did not depend on the product dose (dose range 0.5–1.5 g/m³). The biocide product, recipe of which is pending patent approval, was dosed into the water withdrawn from the cooling tower circulation system of the Laziska Power Plant, supplied by surface water intake. It was shown that the biocide product was effective against Escherichia coli as well as mesophilic and psychrophilic bacteria, with the highest efficacy to inactivate E. coli (100% at a dose 0.5 g/m³). The product was up to 10% more effective against mesophilic than psychrophilic bacteria. The study results form the basis for further studies on the effective dose of silver nanoparticle containing product that would limit bacterial growth and biofilm formation in cooling systems.

Źródło:

Ochrona Środowiska; 2014, 36, 2; 43-46
1230-6169

Pojawia się w:

Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 47.

Tytuł:

Numerical simulation of thermally loaded aircraft engine turbine blade covered with thermal barrier coating - TBC

Autorzy:

Łazarczyk, M.
Domański, R.

Powiązania:

https://bibliotekanauki.pl/articles/246553.pdf

Data publikacji:

2012

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

aircraft engines
turbine
TBC
coating
blade cooling

Opis:

The objective of this thesis is to present the impact of the turbine blade cooling on blade material temperature as well as to assess advantages and disadvantages of applied cooling method (TBC coating combined with internal cooling). To calculate the conjugated heat transfer analysis generating 3d model and mesh of the blade and its cooling was required. Model mesh was covered with boundary layer in order to properly simulate conditions near the blade walls and obtain accurate results. Calculated blade was put in the canal simulating hot combustion gasses flow. Geometry of model described above was created using Unigraphics NX5 program based on drawings obtained from available literature, and data acquired from the Internet. The discretization was done in commercial pre--processor GAMBITŽ. Conjugated heat transfer analysis was conducted in program FLUENTŽ for two different cases, where the TBC material properties were changed. The goal of this thesis was to obtain temperature fields and distribution in the turbine blade airfoil and to evaluate if applied cooling is sufficient to cool down this thermally loaded part of the engine. Calculated results show that proposed blade heat protection with TBC and internal cooling canal is insufficient during steady state condition, especially on the blade leading and trailing edge. In these two locations, the TBC coating is overheated, and the high temperature level of blade material is unacceptable for materials used in jet engine turbine industry.

Źródło:

Journal of KONES; 2012, 19, 3; 271-277
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 48.

Tytuł:

Influence of the coolant temperature on emission of toxic compound and engine work parameters

Autorzy:

Walentynowicz, J.

Powiązania:

https://bibliotekanauki.pl/articles/242404.pdf

Data publikacji:

2009

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

combustion engines
cooling systems
higher coolant temperature

Opis:

The selected results of investigations of the cooling system for the combustion engine working with higher temperature of the cooling liquid were presented. The temperature of this liquid were increased to the temperature of boiling water, as a basic compound of the cooling liquid. This system was designed for the four cylinder diesel engine 4CT90 with indirect fuel injection system. Investigation was realized on the dynamometer stand equipped with standard measure devices (measures: speed, torque, temperatures, flows) and exhaust gas analyzers. The speed and torque engine characteristics were determined. The over pressure inside cooling system was limited up to 0.07 MPa regarding lower pressure structural integrity of the standard units of this system. Intensity of the cooling, protective against too higher pressure, were changed by switching small and full liquid circulation, and one or two fans of the cooler. temperature inside cooling system was increased up to 110 centigrade. Results ofincreasing of the cooler temperature were lower frictions of unburned products of combustion process (CO and HC) in the exhaust gas (up to 50%) in low torque and low engine speed. This is area when catalytic reactor does not work because too low is exhaust gas temperature. It wasfound that engine economy was increased to 7% in maocimum load and high engine speed.

Źródło:

Journal of KONES; 2009, 16, 1; 583-590
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

The operation limitation of the two-stage reliquefaction cycle employed on board the ethylene carrier

Autorzy:

Nanowski, D.

Powiązania:

https://bibliotekanauki.pl/articles/242707.pdf

Data publikacji:

2016

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

ethylene carrier
cargo-cooling rate
reliquefaction plant

Opis:

Ethylene, propane, commercial propane or HD-5 is cargoes very often carried by sea. In order to reduce the time of loading and later cooling down to required parameters of temperature and pressure in the cargo tanks two-stage reliquefaction cycle is used. For above-mentioned cargoes, two-stage cycle with liquid subcooling and interstage cooler is one of the most often utilized. In this paper operation of this cycle is discussed, based on parameters of the reciprocating cargo compressor and its cycle used on board the one of the biggest – 21 500 m3 – ethylene carrier in the world. It is explained how some vapour mixtures decrease cooling rate during reliquefaction of the cargo and some parameters of pressure and temperature of these mixtures are calculated with help of ProSimPlus – thermodynamic simulator. In this way, changes of the mixtures composition across reliquefaction plant are discussed. Increased pressure of the cargoes condensing as a way of solving of explained problem is analysed. Three stage – cycle of reliquefaction plant used for pure propane or ethylene is shown and some of its disadvantages are explained. Based on this discussion, three-stage cycle with liquid injection is proposed to fulfil operation requirements of the cargoes and improve their loading and cooling processes on board the ethylene carrier. Analysis of refrigeration capacity for both cycles is carried out.

Źródło:

Journal of KONES; 2016, 23, 4; 359-365
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Performance Enhancement of a Photovoltaic Module by Passive Cooling Using Water-Based Aluminum Oxide Nano-Fluid

Autorzy:

Hamdan, Mohammad A.

Powiązania:

https://bibliotekanauki.pl/articles/2086398.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

PV cooling
nanotechnology
PV performance
fined PV

Opis:

The performance of a PV (photovoltaic) module relies heavily on the operating temperature. The aim of the current study was to improve PV performance by passive cooling with nano-coated aluminum fins attached to the backside of the photovoltaic panels. Four identical PV panels were installed side by side for simultaneous measurements. The first one (B) is a basic PV that was used for comparison purposes, the second one (N) PV, which is coated with water-based Al2O3 nano-fluid, the third is finned PV (F), with fins being attached to its backside and the Al2O3 nano-fluid coated fins are attached to the backside of the fourth PV (FN). The hourly electrical generated power by each PV, I-V, and I_V curves for each PV were recorded and stored using I-V Checker. In addition, the backside temperature of each PV and the ambient temperature were measured on an hourly basis using K-type thermocouples; the measured temperature values were stored in a data logger. It was found that the (FN) PV gave the best performance compared to the base unit, with an increase in the generated power by 5.77%, followed by the nanocoated (N) PV with an increase of 2.14% and finally the finned (F) PV with an increase of 0.74%. Furthermore, the PV with the nano-coated fins exhibits the lower temperature 31°C, followed by the nano-coated PV, and finally the fined PV, with the backside average temperature of the basic unit being 39°C.

Źródło:

Journal of Ecological Engineering; 2022, 23, 4; 276--283
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

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