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장성운,전청덕 忠州大學校 2003 한국교통대학교 논문집 Vol.38 No.4
An experiment was carried out to investigate the characteristics of the evaporation heat transfer and pressure drop for refrigerant R407C in a fin-and-tube heat exchanger of commercial air-conditioning unit. Test was conducted at the conditions of inlet refrigerant evaporation temperature 7℃, inlet air relative humidity of 40~50%, and refrigerant mass flux varying from 150 to 250kg/m2s. The evaporation temperature of the refrigerant at the test section inlet were maintained at 7℃. Evaporation performance of R407C was 4.6~11.7%, 2.5~15% lower than compared to that of R22 for relative humidity 40% and 50% respectively and this difference was increased as the refrigerant mass flux increases. The experimental data were also useful in analyzing the effects of the temperature glide and length of two phase region for ternary non-azeotropic refrigerant mixture R407C, which is one of the potential candidates for the replacement of pure refrigerant R22.