Page No 279 – Effects of tube shape on boiling heat transfer of low-pressure refrigerantR1233zd(E) outside horizontal tubes – 13th IEA Heat Pump Conference, Jeju, Korea
Hydro-fluoro-olefins and hydro-chloro-fluoro-olefins, such as R1234ze(E), R1234ze(Z), and R1233zd(E), are anticipated to become low global warming potential refrigerants to replace R134a and R245fa for industrial heat pump systems. Experimental data on the heat transfer coefficient of saturated pool boiling of R1233zd(E) on a horizontal fin tube were obtained in this study. The test tube was 19.05 mm in diameter and 400 mm in heat transfer length. The heat transfer coefficients in the two kinds of fin tube were compared. The heat transfer characteristics differed according to the slit on cover of tunnel structure.