Abstract
Abstract ： The cooling heat transfer coefficient of CO 2 in a brazing type small diameter tube was investigated experimentally. The main components of th e refrigerant loop are a receiver, a CO 2 compressor, a mass flow meter, an evaporator and a brazing type small diameter tube as a test section. The mass flux of CO 2 is 400~1600 [kg/m 2 s], the mass flowrate of coolant were varied from 0.15 to 0.3 [kg/s], and the cooling pressure of gas cooler were from 8 to 10 [MPa]. The cooling heat transfer coefficients of the brazing type small diameter copper tube is about 4~11.7% higher than that of the conventional type small diameter copper tube. In comparison with test result s and existing correlations, correlations failed to predict the cooling heat t ransfer coefficient of CO 2 in a brazing type small diameter copper tube. therefore, it is nec essary to develope reliable and accurate predictions determining the cooling heat transfer coefficient of CO 2 in a brazing type small diameter copper tube.
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