Evaporation Heat Transfer Characteristics of Hydrocarbon Refrigerants R-290 and R-600a in the Horizontal Tubes
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Abstract
This paper presents the experimental results of evaporation heat transfer coefficients of HC refrigerants (e.g. R290 and R600a), R-22 as a HCFCs refrigerant and R-134a as a HFCs refrigerant in horizontal double pipe heat exchangers, having four different inner diameters of 10.07, 7.73, 6.54 and 5.80 mm respectively. The experiments of the evaporation process were conducted at mass flux of 35.5~210.4 kg/m2s and cooling capacity of 0.95~10.1 kW. The main results were summarized as follows:The average evaporation heat transfer coefficient of hydrocarbon refrigerants(R-290 and R-600a) was higher than the refrigerants, R-22 and R-134a. In comparison with R-22, the evaporation heat transfer coefficient of R-134a is approximately -11~8.1 % higher, R-290 is 56.7~70.1 % higher and R-600a is 46.9~59.7 % higher, respectively. In comparison with experimental data and some correlations, the evaporation heat transfer coefficients are well predicted with the Kandlikar's correlation regardless of a type of refrigerants and tube diameters.
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