Browse > Article

Study on Evaporation Heat Transfer of R-l34a, R-407C, and R-410A in the Oblong Shell and Plate Heat Exchanger  

박재홍 (부경대학교 냉동공조공학과)
김영수 (부경대학교 기계공학부)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.16, no.9, 2004 , pp. 845-854 More about this Journal
Abstract
The evaporation heat transfer coefficient for R-l34a, R-407C (a mixture of 23wt% R-32, 25 wt% R-125, and 52 wt% R-l34a) and R-410A (a mixture of 50 wt% R-32 and 50 wt% R-125) flowing in the oblong shell and plate heat exchanger were investigated experimentally in this study. Four vertical counterflow channels were formed in the exchanger by four plates of commercial geometry with a corrugated sinusoid shape of a chevron angle of 45 degree. The effects of the mean vapor quality, mass flux, heat flux, and saturation temperature of different refrigerants on the evaporation heat transfer were explored in detail. Similar to the case of a Plate heat exchanger, even at a very low Reynolds number, the flow in the oblong shell and plate heat exchanger remains turbulent. It is found that the evaporation heat transfer coefficient in the plates is much higher than that in circular pipes. The present data show that the evaporation heat transfer coefficients of all refrigerants increase with the vapor quality. At a higher mass flux h, is higher than for the entire range of the vapor quality. Raising the imposed wall heat flux was found to slightly improve h$_{r}$, while h$_{r}$ is found to be lower at a higher refrigerant saturation temperature. A comparison of the performance of the various refrigerants reveals that R-410A has the highest heat transfer performance followed by R-l34a, and R-407C had the lowest performance of the refrigerants tested. Based on the present data, empirical correlations of the evaporation heat transfer coefficient were proposed.sed.
Keywords
Oblong shell and plate heat exchanger; Evaporation; Heat transfer coefficient; Vapor quality;
Citations & Related Records
연도 인용수 순위
  • Reference
1 A genral correlation for flow Boiling in tubes and annuli /
[ Gungor, K.E.;Winterton, R.H.S. ] / Int. J. Heat and Mass Transfer   DOI   ScienceOn
2 Where plate exchangers offer advantages over shell-and-tube /
[ Kerner, J.;Sjogren, S.;Svensson, L. ] / Power
3 Heat transfer savings on a plate /
[ Williams, B. ] / Heating and Air Conditioning Jouranl. Apt.
4 An experimental comparison of evaporation and condensation heat transfer coefficients for HFC-134a and CFC-12 /
[ Eckels, S.J.;Pate, M.B. ] / Int. J. Refirg.   DOI   ScienceOn
5 Two phase boiling characteristics of R-134a and R-12 in annuli of enhanced surface tubing /
[ Sami, S.M.;Duong, T.N. ] / Int. Comm. Heat & Mass Transfer   DOI   ScienceOn
6 Flow Boiling in horizontal tubes: Part 2-New heat transfer data for five refrigerants /
[ Kattan, N.;Thome, J.R.;Favrat, D. ] / Trans. ASME   DOI   ScienceOn
7 Evaporation heat transfer and pressure drop of refrigerant R-134a in a plate heat exchanger /
[ Yan, Y.Y.;Lin, T.F. ] / Transactions of the ASME   DOI   ScienceOn
8 Condensation heat transfer and pressure drop of refrigerant R-134a in a plate heat exchanger /
[ Yan, Y.Y.;Lio, H.C.;Lin, T.F. ] / Int. J. Heat and Mass Transfer   DOI   ScienceOn
9 Saturated flow Boiling heat transfer and pressure drop of refrigerant R-410A in a vertical plate heat exchanger /
[ Lin, T.F.;Hsieh, Y.Y. ] / Int. J. Heat and Mass Transfer   DOI   ScienceOn
10 /
[ Shah, R.K.;Wanniarachchi, A.S.;J.M. Buchlin(ed.) ] / Plate heat exchanger design theory, industrial heat exchangers
11 Heat transfer and friction characteristics of turbulent radiator tubes /
[ Farrell, P.;Wert, K.;Webb, R. ] / SAE Technical Paper Series, No.910197
12 Heat transfer prediction of air-to-refrigerant two-phase flow boiling of alternatives to HCFC-22 inside air/ refrigerant enhanced surface tube /
[ Sami, S.M.;Grell, J. ] / Int. J. Energy Res.   DOI   ScienceOn