Autor: Sikora, T - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Modeling of pressure drop during refrigerant condensation in pipe minichannels
Autorzy:: Sikora, M.
Bohdal, T.
Powiązania:: https://bibliotekanauki.pl/articles/240860.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: minichannels
pressure drop
refrigerant
condensation
minikanał
spadek ciśnienia
chłodziwo
kondensacja
Opis:: Investigations of refrigerant condensation in pipe minichannels are very challenging and complicated issue. Due to the multitude of influences very important is mathematical and computer modeling. Its allows for performing calculations for many different refrigerants under different ﬂow conditions. A large number of experimental results published in the literature allows for experimental verification of correctness of the models. In this work is presented a mathematical model for calculation of ﬂow resistance during condensation of refrigerants in the pipe minichannel. The model was developed in environment based on conservation equations. The results of calculations were verified by authors own experimental investigations results.
Źródło:: Archives of Thermodynamics; 2017, 38, 4; 15--28
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The analysis of thermal and flow characteristics of the condensation of refrigerant zeotropic mixtures in minichannels
Autorzy:: Bohdal, T.
Widomska, K.
Sikora, M.
Powiązania:: https://bibliotekanauki.pl/articles/240470.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: minichannels
condensation
zeotropic mixture
heat transfer coefficient
pressure drop
minikanał
kondensacja
mieszanina zeotropowa
współczynnik przewodnictwa cieplnego
spadek ciśnienia
Opis:: The paper presents the results of experimental heat transfer and pressure drop during condensation of the single component refrigerant R134a and zeotropic mixtures R404A, R407C, and R410A in tube minichannels of internal diameter from the range 0.31–3.30 mm. The local values and the average of heat transfer coefficient and pressure drop in the whole range of the change in mass quality were measured. On the basis of the obtained test results there was illustrated the influence of the change of mass vapor quality, the mass flux density, and the inner diameter of channel on the studied parameters. These results were compared with the calculation results based on the relations postulated by other authors. The discrepancy range was ± 50%. On the basis of given test results own correlation was developed to calculate the heat transfer coefficient and pressure drop of tested refrigerants which presents the obtained results in a range of discrepancy of ±25%.
Źródło:: Archives of Thermodynamics; 2016, 37, 2; 41-69
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Analysis of heat transfer coefficient during refrigerant condensation in vertical pipe minichannel
Autorzy:: Bohdal, T.
Kruzel, M.
Sikora, M.
Powiązania:: https://bibliotekanauki.pl/articles/95295.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:: heat transfer coefficient
heat flux density
minichannel
vapor quality
współczynnik przenikania ciepła
gęstość strumienia ciepła
minikanał
jakość pary
Opis:: This article presents the results of experimental research of R404A, R407C and R410A high-pressure refrigerants condensation in vertical pipe minichannels with an internal diameter d below 2,5 mm. The study determined the local and average heat transfer coefficient in the full range of vapor quality, x= 1-0. On the basis of experimental investigations, the dependence of heat transfer coefficient on the vapor quality x, the mass flux density G and the channel internal diameter d was obtained.
Źródło:: Journal of Mechanical and Energy Engineering; 2017, 1, 1; 65-70
2544-0780
2544-1671
Pojawia się w:: Journal of Mechanical and Energy Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Investigation of flow structures during HFE-7100 refrigerant condensation
Autorzy:: Bohdal, T.
Sikora, M.
Widomska, K.
Radchenko, A. M.
Powiązania:: https://bibliotekanauki.pl/articles/240718.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: condensation
minichannels
flow structures
refrigerant
kondensacja
minikanał
struktura przepływu
czynnik chłodniczy
Opis:: The experimental research of environmentally friendly refrigerant HFE-7100 condensation in pipe minichannels was conducted. During the investigations of HFE-7100 condensation in a minichannel with internal diameter 2 mm together with visualization of flow patterns was made. Visualization results were compared with existing flow structure maps. The identification of the range of flow patterns occurrence during the condensation process of low-pressure refrigerant HFE-7100 was made. The tests were performed throughout the whole range of condensation process.
Źródło:: Archives of Thermodynamics; 2015, 36, 4; 25-34
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

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