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Study on Heat Transfer Characteristics of Evaporator with Horizontal Small Diameter Tubes using Natural Refrigerant Propane  

Ku, H.K. (동명대학교 냉동공조공학과)
Publication Information
Journal of Power System Engineering / v.14, no.4, 2010 , pp. 11-16 More about this Journal
Abstract
The evaporation heat transfer characteristics of propane(R-290) in horizontal small diameter tubes were investigated experimentally. The test tubes have inner diameters of 1 mm and 4 mm. Local heat transfer coefficients were measured at heat fluxes of 12, $24\;kW/m^2$, mass fluxes of 150, $300\;kg/m^2s$, and evaporation temperature of $15^{\circ}C$. The experimental results showed that the evaporation heat transfer coefficient of R-290 has an effect on heat flux, mass flux, tube diameter, and vapor quality. The evaporation heat transfer of R-290 has an influenced on nucleate boiling at low quality and convective boiling at high quality. The evaporation heat transfer coefficient of R-290 increases with decreasing inner tube diameter. And the evaporation heat transfer coefficient of R-290 is about 1~3 times higher than that of R-134a.
Keywords
Evaporation Heat Transfer; Heat Flux; Natural Refrigerant; Pressure Drop; Propane;
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