Autor: Charun, H. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Experimental investigations into the impact of the void fraction on the condensation characteristics of R134a refrigerant in minichannels under conditions of periodic instability
Autorzy:: Kuczyński, W.
Charun, H.
Powiązania:: https://bibliotekanauki.pl/articles/240014.pdf
Data publikacji:: 2011
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: kondensacja
minikanały
okresowe niestabilności
udział objętościowy
condensation
minichannels
Periodic instabilities
void fraction
Opis:: This paper present the results of experimental investigations of condensation of R134a refrigerant in pipe minichannels with internal diameters 0.64, 0.90, 1.40, 1.44, 1.92 and 3.30 mm subject to periodic pressure instabilities. It was established that as in conventional channels, the displacement velocity of the pressure instabilities distinctly depends on the frequency of their hydrodynamic generation. The void fraction distinctly influences the velocity of the pressure instabilities. The form of this relationship depends on the internal diameter of the minichannels and on the method of calculating the void fraction.
Źródło:: Archives of Thermodynamics; 2011, 32, 2; 21-37
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 2.

Tytuł:: Pressure drop during condensation of refrigerants in pipe minichannels
Autorzy:: Bohdal, T.
Charun, H.
Sikora, M.
Powiązania:: https://bibliotekanauki.pl/articles/240165.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: kompaktowy kondensator
przepływ
skraplanie
skraplaniea w minikanałach
spadek ciśnienia
compact condenser
condensation in minichannels
pressure drop during flow in condensation
Opis:: The present paper describes results of experimental investigations of pressure drop during the condensation of R134a, R404a and R407C refrigerants in pipe minichannels with internal diameter 0.31-3.30 mm. The results concern investigations of the mean and local pressure drop in single minichannels. The results of experimental investigations were compared with the calculations according to the correlations proposed by other authors. A pressure drop during the condensation of refrigerants is described in a satisfactory manner with Friedel and Garimella correlations. On the basis of the experimental investigations, the authors proposed their own correlation for calculation of local pressure drop during condensation in single minichannels.
Źródło:: Archives of Thermodynamics; 2012, 33, 1; 87-106
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 3.

Tytuł:: Heat transfer during condensation of refrigerants in tubular minichannels
Autorzy:: Bohdal, T.
Charun, H.
Sikora, M.
Powiązania:: https://bibliotekanauki.pl/articles/239949.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: chłodzenie
kompaktowy kondensator
kondensacja w minikanałach
wymiana ciepła
compact condenser
condensation in minichannels
heat transfer
refrigeration
Opis:: Abstract The present paper describes the results of experimental investigations of heat transfer during condensation of R134a, R404A and R407C in pipe minichannels with internal diameters 0.31-3.30 mm. The results concern investigations of the local heat transfer coefficient. The results were compared with the correlations proposed by other authors. Within the range of examined parameters of the condensation process in minichannels made of stainless steel, it was established that the values of the heat transfer coefficient may be described with Akers et al., Mikielewicz and Shah correlations within a limited range of the mass flux density of the refrigerant and the minichannel diameter. On the basis of experimental investigations, the authors proposed their own correlation for the calculation of local heat transfer coefficient.
Źródło:: Archives of Thermodynamics; 2012, 33, 2; 3-22
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

Artykuł

Skocz do pozycji: 4.

Tytuł:: Condensation of refrigerant R407C in multiport minichannel section
Autorzy:: Bohdal, T.
Charun, H.
Sikora, M.
Powiązania:: https://bibliotekanauki.pl/articles/240486.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: condensation
minichannels
R407C refrigerant
heat exchanger
kondensacja
minikanały
czynnik chłodniczy R407C
wymiennik ciepła
Opis:: Analysis of the state of-the-art in research of refrigerant condensation in miniature heat exchangers, so-called multiports, was made. Results of refrigerant R407C condensation in a mini condenser made in the form of two bundles of tubular minichannels from stainless steel with an inside diameter 0.64 mm and length 100 mm have been presented. Two exchangers consisted of four minichannels and 8 minichannels have been investigated. The values of average heat transfer coefficient and frictional pressure drops throughout the condensation process were designated. The impact of the vapor quality of refrigerant and the mass flux density on the intensity of heat transfer and flow resistance were illustrated. A comparative analysis of test results for various refrigerants in both mini heat exchangers were made.
Źródło:: Archives of Thermodynamics; 2016, 37, 4; 3-18
1231-0956
2083-6023
Pojawia się w:: Archives of Thermodynamics
Dostawca treści:: Biblioteka Nauki

Artykuł

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