순수냉매의 수평원관내 응축열전달 특성

초록

Flow Condensation heat transfer coefficients of R22, R134a, R32, R125, R12, R142b, R123 were measured experimentally for a horizontal plain tube in an apparatus composed of three major loops; a refrigerant loop, a water loop, and a water-glycol loop. Test section in a refrigerant loop was made of a copper tube of 8.8mm inner diameter and 1000mm length respectively. The refrigerant was cooled by passing cool water through an annulus surrounding the test section. All tests were performed at a fixed refrigerant saturation temperature of 40℃ with mass fluxes of 100∼300kg/m2s. Also, we introduced condenstion latent heat and developed a new correlation for condensation heat transfer coefficients by modifying Dobson's equation. The RMS deviation and mean deviation of the measured heat transfer coefficients from the developed correlation for experimental refrigerants were 13.07% and -1.35%, respectively.