Condensation and evaporation of R134a, R1234ze(E) and R1234ze(Z) flow in horizontal microfin tubes at higher temperatures.
作者： Chieko Kondou , Fumiya Mishima , JinFan Liu , Shigeru Koyama
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摘要: The hydrofluoro-olefins R1234ze(E) and R1234ze(Z) are anticipated to be environmentally friendly working fluids for industrial high-temperature heat pumps. This study presents the experimental data obtained transfer coefficient pressure gradient of these refrigerants in a horizontal microfin tube measured at temperatures 65°C condensation 30°C evaporation. For condensation, higher than those R1234ze(E), mainly because vapor velocity due lower density, liquid thermal conductivity latent compared with R134a R1234ze(E). evaporation, was somewhat but only qualities. However, notably that A comparison between predicted values validated (HTC) R123ze(E) can accurately using existing correlations currently available predictions thermophysical properties.
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