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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

Evaporation heat transfer characteristics of low GWP refrigerants

Minsoo Kim
Graduate School of Mechanical Engineering, Sungkyunkwan University Seobu-Ro, 2066, Jangan-gu, Suwon, Korea

Keumnam Cho
School of Mechanical Engineering, Sungkyunkwan University Seobu-Ro, 2066, Jangan-gu, Suwon, Korea

Abstract

The present study investigated evaporation heat transfer coefficient and pressure drop of low GWP refrigerants such as R-446A, R-1234ze(E), and R-1233zd(E). The heat transfer coefficients were investigated by measuring outer wall temperature on a straight stainless tube with an inner diameter of 7.4mm and refrigerant temperature estimated by using refrigerant saturation pressure. The heat transfer coefficients were measured for the quality from 0.1 to 0.9, the mass flux from 100 to 400 kg/m2s, the heat flux from 10 to 30 kW/m2, and the saturation temperature from 5 to 10°C. The effect of mass flux on the evaporation heat transfer coefficient was not significant at low quality, while it was increased at high quality. The heat transfer coefficients of R-446A were larger than those of R-410A. The pressure drop of R-1233zd(E) showed the largest among three of them.

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