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Wyświetlanie 1-15 z 33
Tytuł:
Momentum and heat exchange in the lowest atmosphere layer at the Arctowski Station
Autorzy:
Cygan, Barbara
Wielbińska, Danuta
Powiązania:
https://bibliotekanauki.pl/articles/2057280.pdf
Data publikacji:
1985
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
momentum and heat exchange
Arctowski Station
Źródło:
Polish Polar Research; 1985, 6, 4; 437-447
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
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:
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 investigation of heat exchange in rotary furnace
Autorzy:
Kolczyk, E.
Miczkowski, Z.
Czernecki, J.
Powiązania:
https://bibliotekanauki.pl/articles/354348.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
numerical simulation
heat exchange
rotary furnace
slag reduction process
Opis:
Process of heat exchange in a rotary furnace during converter slag reduction was modelled.Temperature distribution in the furnace and temperature of the charge (slag) only were examined. Influence of modification of the process gas supply method by changing the number of nozzles on the course of the reduction process was analyzed. It has been found out that application of a nozzle as a submerged flame burner provides possibilities to reach higher charge temperature. Application of more nozzles in the process of converter slag reduction can increase temperature of reduced slag and provide better uniformity of charge heating.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 1; 149-153
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
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:
Heat exchange in the subsurface soil layer in the Hornsund area (Spitsbergen)
Autorzy:
Głowicki, Bronisław
Powiązania:
https://bibliotekanauki.pl/articles/2057333.pdf
Data publikacji:
1985
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
meteorology
heat exchange with the underlying layer
Źródło:
Polish Polar Research; 1985, 6, 3; 331-339
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Hygrothermal Conditions of External Partitions in an Underground Fruit Store
Autorzy:
Nawalany, G.
Sokołowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/123816.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
fruit store
energy management
heat exchange
hygrothermal conditions of partitions
Opis:
The paper presents the analysis of hygrothermal conditions of external partitions in an underground fruit store. The results of measurements of temperature and humidity of the indoor and outdoor air as well as the surface surrounding temperature and the temperature of the air surrounding the store constituted the boundary conditions for the hygrothermal calculations. The paper presents the calculation of the distribution of the temperature and humidity on the ground floor, the wall contacting the ground, the wall contacting the outside air, and the ceiling above the storage chamber. The heat and moisture calculations have shown high risk of condensation submerged in non-insulated external walls. The condition of the adaptation of a traditional cold store to a simple and atmosphere controlled cold one is to increase the thermal resistance of the partitions. Such a solution will let cut the energy demand in those types of agricultural buildings.
Źródło:
Journal of Ecological Engineering; 2016, 17, 4; 75-82
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the flow conditions in a high-performance heat exchanger
Autorzy:
Łopata, S.
Ocłoń, P.
Powiązania:
https://bibliotekanauki.pl/articles/240227.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
awaria
symulacja komputerowa
wymiana ciepła
computational simulation
failure
heat exchange
Opis:
CFD (Computational Fluid Dynamics) computations are carried out in order to investigate the flow distribution and its influence on the heat transfer processes in the high-performance heat exchanger. The subject of this investigation is the classical model of the high-performance heat exchanger with elliptical tubes and rectangular fins. It is possible to find the flow domains where the heat transfer conditions are impaired due to the fully developed turbulent flow. Therefore, the considerable thermal loads occur that may cause the breakdown of the heat exchanger. The emphasis of this investigation is put on the zones and the locations where the tubes are not properly fed with liquid, that result in occurrence of cavitation.
Źródło:
Archives of Thermodynamics; 2010, 31, 3; 37-53
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods of increase of operating properties of transport vehicles in the conditions of low temperatures
Metody povyshenija exkspluatacjinnykh svojjstc transportnykh sredstv v uslovijakh nizkikh temperatur
Autorzy:
Kulikov, Y.
Azhippo, A.
Orobcov, T.
Powiązania:
https://bibliotekanauki.pl/articles/791831.pdf
Data publikacji:
2013
Wydawca:
Komisja Motoryzacji i Energetyki Rolnictwa
Tematy:
operating property
vehicle
transport
low temperature
diesel fuel
heat transfer
exploitation
heat exchange
Źródło:
Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2013, 13, 3
1641-7739
Pojawia się w:
Teka Komisji Motoryzacji i Energetyki Rolnictwa
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A simplified model of parasitic radiation in IR bolometer camera
Autorzy:
Strąkowski, R.
Więcek, B.
Powiązania:
https://bibliotekanauki.pl/articles/973071.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
radiation model
configuration factor
uncooled camera
residual non uniformity
heat exchange
Opis:
This article presents the impact of thermal radiation of the internal elements of the camera on temperature and its distribution on the bolometers of the Focal Plane Array. In order to estimate the effect of this component, a simplified radiation heat transfer model was created for the detector, the object and the camera housing. The model is based on the known term of radiation configuration factors. It was also suggested to use a radiation screen to isolate the detector from the influence of the camera housing. Finally, results of numerical simulations for different camera work conditions are presented.
Źródło:
Measurement Automation Monitoring; 2017, 63, 3; 94-97
2450-2855
Pojawia się w:
Measurement Automation Monitoring
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:
Induction heater in the electric pasteuriser
Autorzy:
Bodziak, K.
Goleman, R.
Nalewaj, K.
Powiązania:
https://bibliotekanauki.pl/articles/25826.pdf
Data publikacji:
1999
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
thermal field
heat exchange
heating system
electromagnetic field
induction heater
electrical pasteuriser
Źródło:
International Agrophysics; 1999, 13, 3
0236-8722
Pojawia się w:
International Agrophysics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stream water temperature: a short review with special reference to diurnal dynamics
Autorzy:
Łaszewski, Maksym
Powiązania:
https://bibliotekanauki.pl/articles/2035823.pdf
Data publikacji:
2013-04-10
Wydawca:
Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
Tematy:
Stream water temperature
Heat exchange processes
Diurnal dynamics
Data loggers
Świder river
Opis:
Dynamic changes in stream water temperature are caused by thermal energy exchange at the interface between the water and the atmosphere, and between the water and the streambed. This heat flux is the result of physical processes which are stimulated by external drivers that control water temperature both in temporal and spatial scales. For streams, the most characteristic are diurnal fluctuations of temperature. For the purposes of this paper, electronic data loggers were used which allowed a presentation of the diurnal cycles of water temperature in a small lowland river. The measurements confirmed that meteorological conditions have a significant impact on the diurnal dynamics of stream temperature.
Źródło:
Miscellanea Geographica. Regional Studies on Development; 2013, 17, 1; 34-41
0867-6046
2084-6118
Pojawia się w:
Miscellanea Geographica. Regional Studies on Development
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Intensification of heat transfer between heat exchange surfaces at low RE values
Autorzy:
Cernecky, J.
Brodnianska, Z.
Koniar, J.
Powiązania:
https://bibliotekanauki.pl/articles/184897.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat transfer
heat exchange surface
Colburn j-factor
interferometry
przenikanie ciepła
powierzchnia wymiany ciepła
interferometria
Opis:
This contribution deals with the heat transfer parameters and pressure losses in heat exchange sets with six geometrical arrangements at low Re values (Re from 476 to 2926). Geometrical arrangements were characterised by the h/H ratio ranging from 0.2 to 1.0. The experiments used the holographic interferometry method in real time. This method enables visible and quantitative evaluations of images of temperature fields in the examined heat exchange. These images are used to determine the local and mean heat transfer parameters. The obtained data were used to determine the Colburn j-factor and the friction coefficient f. The measured values show that by using the profiled heat exchange surfaces and inserting regulating tubes, an intensification of heat transfer (increase of Num, and/or j) was achieved. However, pressure losses recorded a significant increase (increase of f).
Źródło:
Chemical and Process Engineering; 2015, 36, 3; 331-344
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Distribution of heat exchange coefficient and vertical two-phase cross-flow structures examination over tube bundles, using DPIV and electrochemical methods
Badanie nierównomierności rozkładu współczynnika wnikania ciepła na powierzchni rur oraz niejednorodności struktur wokół rur, przy przepływie mieszaniny dwufazowej z wykorzystaniem metody elektrochemicznej i DPIV
Autorzy:
Karaś, M
Zając, D.
Ulbrich, R.
Powiązania:
https://bibliotekanauki.pl/articles/2073407.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wymiana ciepła
DPIV
elektrochemiczna
przepływ dwufazowy
heat exchange
electrochemical method
two-phase flow
Opis:
Przeprowadzono badania nad przepływem dwufazowym wznoszącym przez przestawny i równoległy pęk rur. Za pomocą cyfrowej anemometrii obrazowej DPIV dokonano wizualizacji przepływu. Do określenia nierównomierności wymiany ciepła na powierzchni rurek wykorzystano elektrochemiczną metodę opartą na analogii wymiany ciepła i masy. Wyniki otrzymane dwiema metodami zestawiono badając wpływ rozkładu pola prędkości wokół rur na intensywność wymiany ciepła na jej powierzchni.
Two-phase vertical flow over a tube bundle was examined. To calculate the heat transfer coefficient on tubes' surface, the electrochemical technique based on heat and mass transfer analogy was used. The Digital Particle Image Velocimetry (DPIV) technique was applied to create velocity fields around tubes. The results obtained using both methods were compared in order to get an overview of velocity distribution around the tube and its influence on heat transfer intensity on its surface.
Źródło:
Inżynieria i Aparatura Chemiczna; 2013, 5; 431--432
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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