Abstract
Considerable attention has recently been given to R245fa for applications such as high temperature heat pump. In this paper, the condensation heat transfer characteristics of R245fa in a smooth tube and an internally enhanced tube are experimentally studied. The ranges of condensation temperature, mass flux and cooling water flux are 30~45°C, 84~197kg/m2·s and 732~1228kg/m2 ·s, respectively. The two tubes with a 4.58 mm inner diameter, 5mm outer diameter and 2000 mm length are used. The heat transfer coefficient in each case was analyzed carefully. The case study results show that condensation heat transfer coefficients increase with the increase of mass flux, but decrease with the condensation temperature. And the influence of cooling water flux on heat transfer coefficient is small. Compared the heat transfer coefficient between the smooth tube and the internally enhanced tube, Enhanced rates is 1.8 to 2.5.
Published Version
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