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수평 평활관에서 Low GWP 냉매의 막응축 열전달계수에 관한 연구
고지운(Ji-Woon Ko),김선창(Seon-Chang Kim),장수영(Soo-Yeong Jang),전동순(Dong-Soon Jeon) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
In this study, we performed experimental investigations on film condensation heat transfer characteris tics of Low GWP refrigerants over a horizontal smooth tube. Low GWP refrigerants used in this study were R1234ze(E) and R1233zd(E). The saturation temperature and the surface subcooling temperature were 38℃ and 2~16℃ respectively. It was found that ranges of the heat transfer coefficients of R134 a, R1234ze(E) and R1233zd(E) were 2.23 ~ 1.68 kW/m²K, 2.01 ~ 1.46 kW/m²K and 1.54 ~ 1.24 kW/m²K respectively. Correlations of film condensation heat transfer coefficients for R1234ze(E) and R123 3zd(E) were also suggested in the present study.