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수력직경이 작은 평판관내 R-22 및 R-410A 응축에 관한 연구
정호종(Ho-Jong Jeong),민창근(Chang-Keun Min),김내현(Nae-Hyun Kim),윤백(Baek Youn),김만희(Man-Hoe Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In this study, condensation heat transfer tests were conducted in flat aluminum multi-channel tubes using<br/> R-410A, and the results are compared with those of R-22. Two internal geometries were tested; one with a<br/> smooth inner surface and the other with micro-fins. Data are presented for the following range of variables;<br/> vapor quality (0.1 ~ 0.9), mass flux (200 ~ 600 kg/㎡s ) and heat flux (5 ~ 15 kW/㎡). Results show that the<br/> effect of surface tension drainage on the fin surface is more pronounced for R-22 than R-410A. The smaller<br/> Weber number for R-22 may be responsible. For the smooth tube, the heat transfer coefficient of R-410A is<br/> slightly larger than that of R-22. For the micro-fin tube, however, the reverse is true. Possible reasoning is<br/> provided considering the physical properties of the refrigerants.