Temat: cooling efficiency - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

Tytuł:: Cooling techniques for PV panels: A review
Autorzy:: Kozak-Jagieła, Ewa
Cisek, Piotr
Ocłoń, Paweł
Powiązania:: https://bibliotekanauki.pl/articles/35126202.pdf
Data publikacji:: 2023
Wydawca:: Radomskie Towarzystwo Naukowe
Tematy:: PV cooling methods
solar energy
photovoltaics cooling efficiency enhancement
performance
PV/T
metody chłodzenia paneli fotowoltaicznych
energia słoneczna
zwiększenie wydajności chłodzenia
wydajność
Opis:: Solar energy is considered one of the most dominant renewable energy sources. It can be used to produce electricity through PV panels. Unfortunatly, this technology is subject to limitations. High operating temperature exceeding 25°C, causes the PV panels to overheat, reducing their lifetime and efficiency. Various approaches to PV cooling are used to overcome these challenges.This paper presents a comprehensive overview of different cooling techniques to increase the performance of PV panels. Passive and active PV cooling systems are analysed using air, water, phase change materials (PCMs) and nanofluids as working agents. A review analysis showed that water cooling is better than air cooling. PCMs, which have recently been gaining in popularity, also deserve attention.
Źródło:: Scientiae Radices; 2023, 2, 1; 47-68
2956-4808
Pojawia się w:: Scientiae Radices
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Modeling of the impact of construction solutions on operating parameters of the internal heat exchanger with refrigerant R744
Autorzy:: Janus, Jakub
Skotniczy, Przemysław Jan
Richert, Maria
Powiązania:: https://bibliotekanauki.pl/articles/240370.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: heat exchanger
internal heat exchanger
cooling efficiency
numerical fluid mechanics
wymiennik ciepła
wewnętrzny wymiennik ciepła
efektywność chłodzenia
numeryczna mechanika płynów
Opis:: Work on increasing the efficiency of heat exchangers used in car air conditioning systems may lead to a partial change in the construction of refrigeration systems. One of such changes is the use of smaller gas coolers, which directly translates into a reduction in the production costs of the entire system. The article presents the use of computational fluid dynamics methods to simulate the impact of changing the shape of an internal heat exchanger on the cooling efficiency with R744 as the refrigerant. Internal heat exchangers with different geometry of the outer channels were subjected to numerical analysis. The obtained results of calculations show temperature changes in inner and outer channels on the length of the heat exchanger.
Źródło:: Archives of Thermodynamics; 2019, 40, 1; 145-160
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

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

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Skocz do pozycji: 5.

Tytuł:: Increasing photovoltaic panel power through water cooling technique
Autorzy:: Matias, C. A.
Santos, L. M.
Alves, A. J.
Calixto, W. P.
Powiązania:: https://bibliotekanauki.pl/articles/136175.pdf
Data publikacji:: 2017
Wydawca:: EEEIC International Barbara Leonowicz Szabłowska
Tematy:: photovoltaic panel
water cooling
increasing electrical efficiency
efficiency increase
Opis:: This paper presents the development of a cooling apparatus using water in a commercial photovoltaic panel in order to analyze the increased efficiency through decreased operating temperature. The system enables the application of reuse water flow, at ambient temperature, on the front surface of PV panel and is composed of an inclined plane support, a perforated aluminum profile and a water gutter. A luminaire was specially developed to simulate the solar radiation over the module under test in a closed room, free from the influence of external climatic conditions, to carry out the repetition of the experiment in controlled situations. The first case study was published at EEEIC2016 conference where the panel was submitted to different rates of water flow, from 1 L/min to 4 L/min. In the test conditions without cooling apparatus, the panel reached about 70°C and produced approximately 63Wh. With the cooling apparatus with water flow rate of 2 L/min, the module reached about 50°C and produced approximately 77Wh. However, it has been observed that this water flow was overestimated. A second case study was carried out in order to perform the threshold between the flow and the energy produced. The best ratio was flow of 0.6 L/min and net energy of 77.41Wh. Gain of 22.69% compared to the panel without the cooling system. The best water flow rate was of 0.6 L/min and net energy of 77.41Wh. Gain of 22.69% compared to the panel without the cooling system.
Źródło:: Transactions on Environment and Electrical Engineering; 2017, 2, 1; 60-66
2450-5730
Pojawia się w:: Transactions on Environment and Electrical Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

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

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Skocz do pozycji: 7.

Tytuł:: Model and experimental research of the pressure cooling system for the internal combustion engine
Autorzy:: Krakowski, R.
Powiązania:: https://bibliotekanauki.pl/articles/244930.pdf
Data publikacji:: 2014
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: combustion engines
cooling system
energy balance
engine efficiency
environmental protection
Opis:: In this paper, the existing methods to reduce the heat discharged by the engine were characterized and the efficiency of combustion piston engine was analysed, where it was shown the need and the potential for reducing the heat dissipated directly or indirectly to the surrounding atmosphere. The model of the engine cooling system for high coolant temperature developed through AMESim software was presented in this paper. The model of the cooling system was made based on test stand solution designed and built using original components and units diesel engine 4CT90. The simulation researches results of temperature course and pressure course were shown. In this paper was demonstrated that it is possible to maintain the assumed constant pressure of 0.3 MPa in the system and obtain it at the elevated liquid temperature leading to an increase in overall engine efficiency. These researches were carried out also on the experimental model stand, which confirmed the results obtained in simulation researches. Then 4CT90 engine test stand was described, where speed characteristics as a function of torque, power and specific fuel consumption and load characteristics as a function of the fractions of hydrocarbons, carbon monoxide and carbon dioxide, as well as specific and hourly fuel consumption were performed. Comparison of parameters and efficiency assessment of engine interacts with a traditional and pressure cooling system. The efficiency of the engine with the pressure and a traditional cooling system was evaluated.
Źródło:: Journal of KONES; 2014, 21, 4; 289-296
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

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

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Skocz do pozycji: 9.

Tytuł:: Modelling of a thermoelectric self-cooling system based on thermal resistance networks for linear direct drives in machine tools
Autorzy:: Uhlmann, Eckart
Salein, Sebastian
Polte, Mitchel
Triebel, Florian
Powiązania:: https://bibliotekanauki.pl/articles/99421.pdf
Data publikacji:: 2020
Wydawca:: Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:: legal restrictions
productivity
energy efficiency
thermoelectric generator
cooling
modelling
MATLAB/Simulink
Opis:: The use of direct drives in linear and rotary axes as well as increased power density of main drives offer the potential to raise feet rate, acceleration and thus allow higher productivity of machine tools. The induced heat flow rates of these drives could lead to thermo-elastic deformations of precision related machine tool components. In order to reduce thermally caused displacements of the tool-center-point and to prevent a negative impact on the achievable accuracy, the induced heat flow rates of main drives must be dissipated by effective cooling systems. These systems account for a major share of the machine tool’s total energy consumption.With the intention to overcome the area of conflict regarding productivity and energy efficiency, a so called thermoelectric self-cooling system has been developed. To convert a proportion of thermal losses into electrical energy, thermoelectric generators are placed in the heat flow between the primary part of a linear direct drive and the cooling system. The harvested energy is directly supplied to a pump of the water cooling circuit, which operates a decentralised cooling system with reasonable coolant flow rates. For predicting the thermoelectric system behaviour and to enable a model-based design of thermoelectric self-cooling systems, a thermal resistance network as a system simulation in MATLAB/Simulink is presented. The model is applied to a feed unit with a linear direct drive and allows the calculation of harvested energy as well as the simulation of steady and transient states of the cooling system. The comparison of simulative and experimental determined data indicates a predominantly high model prediction accuracy with short simulation times. At an early stage of development the model turns out to be a powerful tool for design and analysis of water flow thermoelectric self-cooling systems.
Źródło:: Journal of Machine Engineering; 2020, 20, 1; 43-57
1895-7595
2391-8071
Pojawia się w:: Journal of Machine Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: The influence of external cooling system on the performance of supercritical steam turbine cycles
Autorzy:: Kosman, W.
Powiązania:: https://bibliotekanauki.pl/articles/240233.pdf
Data publikacji:: 2010
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: para nadkrytyczna
schładzanie
turbina parowa
wydajność
cooling
efficiency
steam turbine
supercritical steam
Opis:: The problem presented in this paper refers to the concepts applied to the design of supercritical steam turbines. The issue under the investigation is the presence of a cooling system. Cooling systems aim to protect the main components of the turbines against overheating. However the cooling flows mix with the main flow and modify the expansion line in the steam path. This affects the expansion process in the turbine and changes the performance when compared to the uncooled turbine. The analysis described here investigates the range of the influence of the cooling system on the turbine cycle. This influence is measured mainly through the change of the power generation efficiency. The paper explains the approach towards the assessment of the cooling effects and presents results of the modeling for three supercritical steam cycles.
Źródło:: Archives of Thermodynamics; 2010, 31, 3; 131-144
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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