An Experimental Study on Heat Transfer Characteristics in Plate Heat Exchangers with R134A

R134A를 이용한 판형 열교환기의 열전달 특성에 관한 실험적 연구

Experiments on the condensation and evaporation heat transfer characteristics inside plate heat exchanger with R134A are performed in this study. The test plate heat exchangers in 45o, 55o and 70o shevron angle are used. Varying the mass flux of the refrigerant and the saturation temperatures, the average heat transfer coefficients are investigated. It is shown that the heat transfer is increased with increasing shevron angle. Experiments results show that average condensation heat transfer coefficients are decreased with increasing condensation temperature but those of evaporation are increased with increasing evaporation temperature.