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김만배(Manbae Kim),박창용(Changyong Park) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
The In this study, the heat transfer and pressure drop characteristics were measureed for a brazed plate heat exchanger (BPHE) operated as an evaporator. The plate pattern of the BPHE was a chevron type and its number of plate was 10. The working fluid was R22 as a refrigerant and water was cooled in the BPHE. For the measurement of the evaporation characteristics, the evaporation temperature was set about 20℃ and the mass flux was controlled about 35 ㎏/㎡s . The average vapor quality was controlled at the range of 0.15-0.6. The average heat transfer coefficients decreased significantly over the vapor quality of 0.5. However, the pressure drop continuously increased to the vapor quality up to 0.6. The measured heat transfer coefficients before the vapor quality of 0.5 ware higher than the calculated values by the previously proposed correlations for the plate heat exchangers with evaporation, which could be caused by the smaller hydraulic diameter of the tested BPHE.