Title: Evaporation Heat Transfer and Pressure Drop of Mixture Refrigerant R-407C
Abstract: The evaporation heat transfer coefficient and pressure drop of R-22 and R-407C in a horizontal copper tube were investigated experimentally. The main components of the refrigerant loop are a receiver, a compressor, a mass flow meter, a condenser and a double pipe type evaporator (test section). The test section consists of a smooth copper tube of 6.4 ㎜ inner diameter. The refrigerant mass fluxes were varied from 100 to 300 ㎏/m²s and the saturation temperature of evaporator were 5 ℃. The evaporation heat transfer coefficients of R-22 and R-407C increase with the increase of mass flux and vapor quality. The evaporation heat transfer coefficients of R-22 is about 5.68~46.6% higher than that of R-407C. The evaporation pressure drop of R-22 and R-407C increase with the increase of mass flux. The pressure drop of R-22 is similar to that of R-407C. In comparison with test results and existing correlations, correlations failed to predict the evaporation heat transfer coefficient of R-22 and R-407C. therefore, it is necessary to develope reliable and accurate predictions determining the evaporation heat transfer coefficient of R-22 and R-407C in a horizontal tube.
Publication Year: 2008
Publication Date: 2008-05-31
Language: en
Type: article
Indexed In: ['crossref']
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