# Plate and Shell 열교환기내의 R-22 응축압력강하 특성에 관한 실험적 연구

• 이기백 (창원기능대학 플랜드설비 자동차과) ;
• 서무교 (부경대학교 대학원 냉동공학과) ;
• 박재홍 (부경대학교 대학원 냉동공학과) ;
• 김영수 (부경대학교 기계공학부)
• Published : 2001.11.01

#### Abstract

The condensation pressure drop fur refrigerant R-22 flowing in the plate and shell heat exchanger were investigated experimentally in this study. Two vertical counterflow channels were formed in the exchanger by three plates of commercial geometry with a corrugated trapezoid shape of a chevron angel of $45^{\circ}$. The condensing R-22 flowing down in one channel exchanges heat with the cold water flowing up in the other channel. The effects of the mean vapor quality, mass flux, average imposed heat flux and system pressure of R-22 on the pressure drop were explored in detail. The quality change of R-22 between the inlet and outlet of the refrigerant channel ranges from 0.03 to 0.05. The present data showed that pressure drop increases with the vapor quality. At a higher mass flux, pressure drop is higher for the entire range of the vapor quality. Also, a rise in the average imposed heat flux causes an slight increase in the Pressure drop. Finally, at a higher system pressure the pressure drop is found to be slightly lower. Correlation is also provided for the measured pressure drops in terms of the friction factor.

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