열전달 촉진관에서 2원 혼합냉매의 응축 열전달 계수

초록

In this study, condensation heat transfer coefficients(HTCs) of R32/R134a mixtures are measured on a horizontal smooth tube, low-fin tube, and Turbo-C enhanced tube. All data are taken at the vapor temperature of 39℃ with wall subcoolings of 3∼8K. HTCs of R32/R134a mixtures are lower than the ideal values calculated by the mass fraction weighting of the pure components' HTCs. The reduction of HTCs of a low-fin and Turbo-C tube due to mixture effects was larger than that of a smooth tube. As the wall subcooling increased, HTCs of these mixtures increased on a low-fin tube and Turbo-C enhanced tube.