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Tytuł:
Cooling and heating of the fluid in the cylindrical volume
Autorzy:
Tkachenko, Stanislav
Vlasenko, Olha
Rezydent, Nataliia
Stepanov, Dmytro
Stepanova, Nataliia
Powiązania:
https://bibliotekanauki.pl/articles/2142869.pdf
Data publikacji:
2022
Wydawca:
Centrum Badań i Innowacji Pro-Akademia
Tematy:
non-stationary heat exchange
regular thermal mode
cooling rate
heating rate
heat transfer coefficient
uneven temperatures distribution coefficient
niestacjonarna wymiana ciepła
zwykły tryb termiczny
szybkość chłodzenia
szybkość ogrzewania
współczynnik przenikania ciepła
współczynnik rozkładu temperatur
Opis:
Experimental studies of the non-stationary heat exchange in the system «environment I – body II» have been carried out. It is established that in the body II, which consists of the fluid and thin-walled metal envelope, the characteristic features of the regular thermal mode occur, i.e., cooling (heating) rate of the body II- m = const; heat transfer coefficient between the water (environment I) and body II is practically stable α1 = const; uneven temperatures distribution coefficient in the body II ψ = const. This new notion of the heat transfer regularities in the body II is planned to apply for further development of the experimental-calculation method for the forecasting of the heat exchange intensity in the compound fluid media with limited information regarding thermophysical and rheological properties.
Źródło:
Acta Innovations; 2022, 42; 15-26
2300-5599
Pojawia się w:
Acta Innovations
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental study of the solid fouling effect on the air-cooled apparatus characteristics
Autorzy:
Morozyuk, Larisa
Sokolovska-Yefymenko, Viktoriia
Moshkatiuk, Andrii
Hrudka, Bohdan
Powiązania:
https://bibliotekanauki.pl/articles/2014236.pdf
Data publikacji:
2021
Wydawca:
Państwowa Wyższa Szkoła Zawodowa w Tarnowie
Tematy:
air condenser
fouling
experimental bench
heat exchange surface
chłodnica powietrza
zanieczyszczenie
stanowisko doświadczalne
powierzchnia wymiany ciepła
Opis:
External fouling on the heat exchange surface of air-cooled apparatus are formed during operation, which leads to a significant increase in energy consumption and deviations from the optimal operating mode of the entire system. This phenomenon is a problem for all energy conversion systems. This paper presents the experimental study results of a complex of a commercial cooled object with real fouling on the air condenser surface. To study the effect of fouling, an experimental bench was developed – a single-stage refrigerating machine that provides cold supply to a thermostatic chamber. Three types of fouling were used: sand, fluff and dust. Fouling were picked from the operating condensers and identical in the type of heat exchange surface to the experimental sample. With a change in the quantitative and qualitative composition of the fouling, the air condenser thermal and aerodynamic characteristics and the energy efficiency of the machine as a whole were determined. The experiment showed that at maximum fouling of the heat exchange surface with sand and fluff, air movement stops. This means that at a certain thickness of sand and fluff layer, an air impermeable dense structure is formed. Dust with the same form of filling the free space for the flow remains permeable to air. Experiments showed that the qualitative composition of the fouling is the main factor that determines the heat exchanger performance. It was found that from the experimental set of fouling, roadside dust has the greatest negative effect on the condenser characteristics and the machine as a whole. The aerodynamic properties of the heat exchanger depend to some extent on the qualitative composition of the fouling. As a conclusion, it was suggested that the process nature of air flow passing through the investigated fouling can be described as gas flows in porous media.
Źródło:
Science, Technology and Innovation; 2021, 12, 1; 1-9
2544-9125
Pojawia się w:
Science, Technology and Innovation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of thermal-flow characteristics of minichannel evaporator of air heat pump
Autorzy:
Kowalczyk, Michał Jan
Łęcki, Marcin
Romaniak, Artur
Warwas, Bartosz
Gutkowski, Artur
Powiązania:
https://bibliotekanauki.pl/articles/1955042.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CFD
numerical methods
heat exchange
minichannel
louvered fin
Opis:
The results of experimental investigations of heat transfer and a friction factor in an air channel of the minichannel heat exchanger are presented. The main aim of the analysis was to examine an influence of geometrical parameters of the fin shape with two geometries on heat transfer and flow characteristics of the air channel. The test rig was designed to monitor the parameters of the airflow during cooling by the minichannel heat exchanger. The analysis was conducted with the airflow in the range of 1–5 m/s. The temperature of the evaporation in a refrigeration system was set at 288.15 K. The energy balance of the refrigeration system was carried out. A numerical model describes the airflow through a part of the heat exchanger. Numerical simulations were validated with the experimental data. Numerical methods were used to evaluate the performance of the system and possibilities to improve the fin geometry. The characteristics of the friction factor (a measure of the pressure loss in the airflow) and the Colburn j-factor (heat transfer performance) were calculated. For the maximal velocity of the airflow, the Colburn factor was equal to 0.048 and the evaporator capacity equaled 1914 W.
Źródło:
Archives of Thermodynamics; 2021, 42, 4; 261-279
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analiza porównawcza wentylacji naturalnej i mechanicznej na przykładzie domu jednorodzinnego
A comparative analysis of natural and mechanical ventilation on the example of a single family house
Autorzy:
Biała, Aneta
Powiązania:
https://bibliotekanauki.pl/articles/294238.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
wentylacja naturalna
wentylacja mechaniczna
odzysk ciepła
wymiana powietrza
rekuperacja
natural ventilation
mechanical ventilation
heat recovery
air exchange
recuperation
Opis:
Tematem artykułu jest analiza porównawcza i próba określenia, który z omawianych typów wentylacji jest najkorzystniejszy w przypadku budynków jednorodzinnych. We wstępie przedstawiono podstawowe wiadomości dotyczące systemów wentylacyjnych stosowanych w budownictwie mieszkaniowym. Starano się przybliżyć jej współczesne problemy wynikające głównie z braku wystarczającego nawiewu świeżego powietrza. Druga część artykułu poświęcona jest analizie porównawczej wentylacji grawitacyjnej i mechanicznej z odzyskiem ciepła przy uwzględnieniu trzech kryteriów: kosztów inwestycyjno-eksploatacyjnych, jakości powietrza nawiewanego do pomieszczeń i zapotrzebowania na energię na cele grzewcze. Przedmiotem badań był projekt budynku jednorodzinnego o powierzchni 185 m2. W pracy wykorzystano wykonane przez autorkę kosztorysy budowy systemów wentylacyjnych aktualne na rok 2018, dane pomiarowe z wojewódzkiego Inspektoratu Ochrony Środowiska w Poznaniu i metodologię wyznaczania charakterystyki energetycznej budynków.
The paper presents a comparative analysis and an attempt to determine which of the analyzed types of ventilation is the most advantageous for single-family buildings. At first basic information on ventilation systems used in residential buildings is presented. Attempts have been made to bring its contemporary problems, resulting mainly from the lack of sufficient fresh air supply. The second part of the article is devoted to the comparative analysis of gravitational and mechanical ventilation with heat recovery system taking into account 3 criteria: investment and operating costs, quality of the air supplied to rooms and energy demand for heating purposes. The subject of the research was the design of a single-family building with an area of 185 m2. The paper uses the author’s cost estimates of the construction of ventilation systems valid for 2018, measurement data from the provincial Inspectorate of Environmental Protection in Poznan as well as the methodology of determining the energy performance of buildings.
Źródło:
Architectus; 2020, 3 (63); 145-160
1429-7507
2084-5227
Pojawia się w:
Architectus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Drying Conditions on the Characteristics and Performance of B/Fe2O3 Nano-Composites Prepared by Sol-Gel Method
Autorzy:
Dinçer Yilmaz, Nil Ezgi
Karakaş, Gürkan
Powiązania:
https://bibliotekanauki.pl/articles/358288.pdf
Data publikacji:
2020
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Tematy:
nanocomposite
pyrotechnic
sequential solvent exchange
proton scavenger
heat output
energetic materials
boron
Opis:
B/Fe2O3 samples were prepared by mixing nano sized boron powder with iron oxide xerogels that had been synthesized using a sol-gel method that included various types of proton scavengers such as 1,2-epoxybutane, tetrahydrofuran, 1,4-dioxane and ammonium hydroxide. The effects of the proton scavengers and drying conditions on the textural properties of the iron oxide samples and on the heat output and thermal behavior of the nano-composites were examined. The iron oxide samples were subjected to direct drying (DD) or sequential solvent exchange (SSE). The heat output values of the B/Fe2O3 nano-composites varied from 240 to 1200 J/g depending on the drying condition and the proton scavenger used. It was found that the thermal behaviour and the textural properties of B/Fe2O3 nano-composites (such as porosity, surface area and crystallinity) could be tailored by both the drying conditions and the proton scavenger used.
Źródło:
Central European Journal of Energetic Materials; 2020, 17, 1; 85-106
1733-7178
Pojawia się w:
Central European Journal of Energetic Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Models of dynamic contact of a 2D thermoelastic bar
Autorzy:
Shillor, Meir
Powiązania:
https://bibliotekanauki.pl/articles/1839665.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
2D bar
dynamic contact
Barber’s heat exchange condition
debonding
humidity diffusion
Opis:
This work is based on a part of the plenary lecture I gave in the PCM-CMM-2019 conference in Krakow, Poland. It presents a new mathematical model for a thermoelastic 2D bar and proposes three problems for the processes of: (i) dynamic contact of the bar with an obstacle below it; (ii) vibrations of the right end between two stops; and (iii) debonding of two bars because of vibrations, humidity and thermal effects. The models are new and questions of existence of weak solutions, analysis of the solutions, effective numerical methods and simulations, as well as possible control, are unresolved yet.
Źródło:
Journal of Theoretical and Applied Mechanics; 2020, 58, 2; 295-305
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ warunków środowiskowych i instalacyjnych na proces wymiany ciepła w wybranych przemysłowych gazomierzach miechowych
Impact of environmental and installation conditions on the heat exchange process in selected industrial diaphragm gas meters
Autorzy:
Dudek, Adrian
Powiązania:
https://bibliotekanauki.pl/articles/1833968.pdf
Data publikacji:
2020
Wydawca:
Instytut Nafty i Gazu - Państwowy Instytut Badawczy
Tematy:
przemysłowe gazomierze miechowe
przyłącze gazowe
nierozliczone ilości gazu
proces wymiany ciepła
warunki atmosferyczne
temperatura gazu podczas pomiaru
temperatura rozliczeniowa
błędy rozliczeniowe
gazomierz termiczny
gazomierz smart
industrial diaphragm gas meters
gas connection
unaccounted amount of gas
heat exchange process
weather conditions
gas temperature during measurement
billing temperature
measurement errors
Power to Gas
PtG
thermal gas meter
smart gas meter
Opis:
Since 2016, Oil and Gas Institute – National Research Institute (INiG – PIB) has been conducting new research to determine the relationship between ambient temperature and gas temperature in industrial diaphragm gas meters during the measurement, and to develop new recommendations for billing systems using industrial diaphragm gas meters with a throughput of until 25 m3 /h. In the first stage, work was carried out, in which the obtained test results confirmed that the heat exchange process in an industrial diaphragm gas meter depends on the ambient temperature, the gas temperature at the inlet to the gas meter, the flow rate of the gas flowing, as well as the casing surface and the gas volume of the gas meter. In the next stage, work was carried out to determine the relationship between ambient temperature and gas temperature at the industrial diaphragm gas meter connection during the measurement. The obtained results undermined the thesis, which indicated that the gas inlet temperature is equal to the gas temperature at the depth of the gas network. In the last stage, work was carried out to determine the course of changes in gas temperature in industrial diaphragm gas meters as a function of ambient temperature and cyclical changes of the gas flow rate, which were to reflect the work of gas meters installed at customers’ premises. The analysis of the obtained test results once again showed a strong dependence of the gas temperature inside industrial diaphragm gas meters on the ambient temperature, but also on the flow rate of gas. The obtained results of laboratory tests will be used to carry out a thermodynamic description of the heat exchange process in an industrial diaphragm gas meter, which would allow the determination of the gas billing temperature as a function of the ambient temperature, the temperature of the inflowing gas and the gas flow rate. The calculated gas temperature values could be used to determine the temperature correction factors applicable when settling gas consumers billed on the basis of measurement with the use of industrial diaphragm gas meters.
Źródło:
Nafta-Gaz; 2020, 76, 11; 828--836
0867-8871
Pojawia się w:
Nafta-Gaz
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of heat exchange in the powertrain of a road vehicle with a retarder
Analiza wymiany ciepła w układzie napędowym pojazdu drogowego z retarderem
Autorzy:
Jamroziak, Krzysztof
Kwasniowski, Stanislaw
Kosobudzki, Mariusz
Zajac, Pawel
Powiązania:
https://bibliotekanauki.pl/articles/300802.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
heavy-duty vehicle operation
vehicle retarder
brake support
heat exchange
użytkowanie pojazdów ciężkich
zwalniacz pojazdu
wspomaganie hamowania
wymiana ciepła
Opis:
The paper presents a heat exchange model for the cooling system of any complex, physical system. Verification of the correctness of the theoretical model was carried out on the example of a vehicle with a combustion engine and additionally equipped with a hydraulic retarder. The results of laboratory tests, which were carried out on an engine test bench, were also performed for the above mentioned powertrain, so as to compare the results of modelling with the results of the tests. Determining the operating parameters of the components of the cooling system aimed at protecting the entire powertrain against overheating is a key task. Theoretical analysis of heat exchange in the powertrain of a road vehicle was carried out, with particular emphasis on the hydraulic retarder (a device braking the vehicle during a descent on roads with a high gradient of the road, mandatory according to the ADR convention). The subject of the study was a mathematical model of a complex cooling system developed by the authors, described by means of balance equations and differential equations. This model was tested with the use of the Matlab-Simulink suite for given load parameters of the cooling system, which were used in tests on an engine test bench. The values of coefficients describing the thermal state of the powertrain were obtained. Simulations were performed for different variants of technical parameters of the expanded cooling system. In this way, individual units and components of the cooling system were optimized so that it fulfilled its role in the assumed operating conditions and the ecologization of emission of energy sources (fuel) and harmful substances.
Praca zawiera model wymiany ciepła układu chłodzenia dla złożonego, dowolnego układu fizycznego. Weryfikację poprawności modelu teoretycznego przeprowadzono na przykładzie pojazdu z silnikiem spalinowym oraz dodatkowo wyposażonym w retarder hydrauliczny. Wyniki badań laboratoryjnych, które przeprowadzono na hamowni również wykonano dla w/w zespołu napędowego, tak aby porównać wyniki modelowania z wynikami badań. Ustalenie parametrów eksploatacji elementów układu chodzenia, którego celem jest zabezpieczenie całego układu napędowego przed przegrzaniem to kluczowe zadanie. Przeprowadzono teoretyczną analizę wymiany ciepła w układzie napędowym pojazdu drogowego ze szczególnym uwzględnieniem zwalniacza hydraulicznego (urządzenia hamującego pojazd podczas zjazdu na drogach o dużym pochyleniu jezdni, obowiązkowe wg konwencji ADR). Przedmiotem badań był opracowany przez autorów model matematyczny rozbudowanego układu chłodzenia opisany za pomocą równań bilansowych i równań różniczkowych. Model ten testowano z wykorzystaniem pakietu Matlab-Simulink dla zadanych parametrów obciążenia układu chłodzenia, które wykorzystywano w badaniach w stanowiskowych na hamowni silnikowej. Uzyskano wartości współczynników opisujących stan cieplny jednostki napędowej. Symulacje wykonano dla różnych wariantów parametrów technicznych rozbudowanego układu chłodzenia. W ten sposób optymalizowano poszczególne zespoły i podzespoły układu chłodzenia, tak aby spełniał on swoją rolę w zakładanych warunkach eksploatacji i ekologizację emisji źródeł energii (paliwa) i szkodliwych substancji.
Źródło:
Eksploatacja i Niezawodność; 2019, 21, 4; 577-584
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Impact of Selected Technical Soil Parameters on the Greenhouse Energy Management
Autorzy:
Nawalany, Grzegorz
Sokołowski, Paweł
Powiązania:
https://bibliotekanauki.pl/articles/125003.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
heat exchange
soil
greenhouse
energy management
soil type
Opis:
The paper is an attempt to determine the impact of soil type and its selected technical parameters on the heat exchange with soil. The test results were based on the all-year-round experimental measurements of soil temperature and indoor and outdoor air in a greenhouse located in southern Poland. The field tests results were used to validate the calculation model using the WUFIplus software. The validation showed a high degree of conformity between the experiments and calculations. Five variants were used in the calculations, differentiated by technical parameters of the soil underneath the greenhouse. The results showed a significant impact of the soil type on the greenhouse energy management.
Źródło:
Journal of Ecological Engineering; 2019, 20, 9; 245-252
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical Analysis of the Impact of the Cooling Cycle Length in Vegetable Cold Stores on the Heat Exchange with Soil
Autorzy:
Sokołowski, Paweł
Nawalany, Grzegorz
Powiązania:
https://bibliotekanauki.pl/articles/124309.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
vegetable cold store
heat exchange
technological interruption
soil temperature
Opis:
The paper includes an analysis of the impact of the cooling cycle length in vegetable cold stores on the heat exchange with soil. The scope involves the analysis of indoor and outdoor air temperature as well as soil temperature under the cold store and in its vicinity, specification and adaptation of the cold store-soil heat exchange model, model validation by comparison of the calculation results with experimental studies, choice of calculation variants, calculations for the used variants in non-stationary conditions, and a comparative analysis of the cold store-soil heat exchange for the used variants and of the soil temperature at selected solutions. The paper used the results of the field tests conducted in a vegetable cold store located in southern Poland. The building was used to store carrots from 1 October to 30 June. Four calculation variants were used for the in-depth study of the impact of selected factors on the heat exchange between the cold store and the soil. The calculations were performed based on the elementary balances method, using WUFI®plus software. The calculation model validation was based on the field measurements of indoor and outdoor air temperature as well as soil temperature in 5 measurement lines at the depth of 0.05, 0.50, 1.00 and 1.50 m. The obtained validation results showed a very good correlation between the measured and calculated data, in addition to an absence of significant differences. The calculation results for the 4 calculation variants showed significant differences in the heat exchange with soil.
Źródło:
Journal of Ecological Engineering; 2019, 20, 9; 162-170
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recycling of Dispersed Metal Wastes in Rotary Furnaces
Autorzy:
Rovin, Sergei Leonid
Kalinichenko, Alexander Sergei
Rovin, Leonid Efim
Powiązania:
https://bibliotekanauki.pl/articles/106943.pdf
Data publikacji:
2019
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
recycling
dispersed metal wastes
rotary tilting furnaces
heat and mass exchange
mix
reduction
Opis:
The recycling of dispersed metal containing wastes is a considerable problem, as their accumulation in dumps today is commensurate with the volume of ore extraction. Several methods and technologies are developed to recycle metal containing wastes but almost all of them require the preliminary preparation of wastes resulting in an increased price of the recycled metals. Furthermore, it is especially difficult to recycle dispersed multicomponent wastes and, therefore, the problem of developing effective, flexible and reliable technology for recycling of dispersed metal containing wastes is still a pressing one. The article presents an alternative method of recycling dispersed iron-containing wastes based on a continuous solid-liquid process of iron oxides reduction in rotary tilting furnaces (RTF). The new method allows the processing of waste of almost any composition and state: from metal lumps to oxide and multicomponent (chips, scale, sludge, etc.) wastes, contaminated with moisture, oils, organic impurities without their preliminary preparation (cleaning, homogenization, pelletizing, etc.). The result of recycling is the production of cast iron or steel ingots or required casting alloys. Some features of technology are considered, including the gas flow and motion of charge metal particles within the RTF. Process parameters providing high metal output are established.
Źródło:
Journal of Casting & Materials Engineering; 2019, 3, 2; 43-49
2543-9901
Pojawia się w:
Journal of Casting & Materials Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal investigations of PCM enhanced electronics cooling
Autorzy:
Felczak, Mariusz
Więcek, Bogusław
Powiązania:
https://bibliotekanauki.pl/articles/114610.pdf
Data publikacji:
2019
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
heat exchange
phase change materials
thermal impedance
cooling of electronic systems
Opis:
The paper presents experimental results of PCM (Phase Change Material) enhanced cooling system. The investigations were focused on obtaining the best results of the cooling system during its start-up. The latent heat of phase change material was used to decrease temperature of the cooled electronic device. Comparison of a standard heat sink available on the market and the same heat sink filled with PCM applications was done. Temperature was monitored and registered during device start-up until its thermal steady state. It was done using contact and IR temperature measurement methods. PCMs usage enabled to absorb heat during electronic device start-up. The paper proves that using PCMs it is possible to delay temperature rise during electronic devices heating.
Źródło:
Measurement Automation Monitoring; 2019, 65, 2; 44-47
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Badania mocy cieplnej w pompie zębatej 3PZ4
Autorzy:
Osiński, P.
Huss, W.
Bury, P.
Kiec, K.
Powiązania:
https://bibliotekanauki.pl/articles/304497.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Druk-Art
Tematy:
pompa zębata
ciepło strat
przegrzanie cieczy hydraulicznej
układ hydrauliczny
wymiana ciepła
gear pump
heat of loss
overheating of the hydraulic fluid
hydraulic system
heat exchange
Opis:
Zbyt wysoka temperatura cieczy hydraulicznej uniemożliwia poprawną pracę układu hydraulicznego i skraca trwałość jego elementów. Pompa zębata o zazębieniu zewnętrznym, z powodu ograniczonej sprawności wynikającej z cech konstrukcyjnych, jest znacznym źródłem ciepła w układzie. Ciepło to w znacznej części odbierane jest przez ciecz hydrauliczną w warunkach konwekcji wymuszonej oraz przez powietrze otoczenia, głównie poprzez konwekcję naturalną. W artykule zaprezentowano wyniki badań dotyczące wzrostu temperatury cieczy hydraulicznej pomiędzy stroną tłoczną a ssawną oraz źródeł ciepła w pompie 3PZ4 produkcji WPH. Wykonano w ramach projektu p.t. „Opracowanie konstrukcji wysokociśnieniowych pomp zębatych”, realizowanego w ramach Programu Badań Stosowanych w ścieżce A Umowa Nr PBS3/A6/22/2015.
Too high hydraulic fluid temperature prevents the correct operation of the hydraulic and reduces the durability of its components. Gear pump with external gear due to reduced efficiency resulting from construction is a significant source of heat in the system. The heat is largely received by hydraulic fluid under conditions of forced convection and ambient air, mainly through natural convection. The article presents the results of tests on the hydraulic fluid temperature rise between the discharge and suction and heat sources in the pump 3PZ4 WPH production. Was performed within the framework of the project entitled “Development of a design of the high-pressure gear pumps” in the framework of the Research Used in the path A, the agreement No PBS3/A6/22/2015.
Źródło:
Napędy i Sterowanie; 2018, 20, 3; 110-114
1507-7764
Pojawia się w:
Napędy i Sterowanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental studies on the effect of the enhancemet of the heating surface on the heat transfer coefficient for boiling in closed volume
Autorzy:
Grabowski, M.
Błachnio, E.
Powiązania:
https://bibliotekanauki.pl/articles/95221.pdf
Data publikacji:
2018
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
boiling
boiling on enhanced surfaces
heat transfer coefficient
Intensification of heat exchange
LabView
wrzenie
wrzenie na wzmocnionych powierzchniach
współczynnik przenikania ciepła
intensyfikacja wymiany ciepła
Opis:
This article presents the results of experimental research on the effect of enhancing the heating surface on the heat transfer coefficient for boiling in a closed volume of ethyl alcohol and isopropyl alcohol. The aim of the research was determination of the impact of heat surfaces enhancements by applying circular cavities on heat transfer coefficient and on vapor structures formation during boiling. The study involved three brass samples with diameters equal to 50 mm, with different enhancements of the heating surface by drilled blind cavities. The research includes investigation of sample without cavities, sample with 133 circular cavities of diameter of 2 mm and sample with 61 circular cavities of diameter of 3 mm. On the basis of the research, the influence of the investigated heat exchange surface enhancement on the intensity of heat exchange was determined. The author’s own interface in the LabView environment for controlling and acquiring measurement data was developed. The boiling process was recorded with a high-speed camera, and based on the obtained video images, the recorded images were analyzed to determine the void fraction. The heat flux density, heat transfer coefficient were calculated and comparative diagrams of the obtained measurement results were made.
Źródło:
Journal of Mechanical and Energy Engineering; 2018, 2, 2; 121-130
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 66

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