高校化学工程学报2012，Vol.26Issue(4)：587-592,6.
R417A和R22在光管和强化管外的凝结换热特性比较
Characteristic Comparison of Condensation Heat Transfers Outside the Smooth and Enhanced Tubes when Using R417A and R22
摘要
Abstract
An experimental study on R417A and R22 film condensation on single horizontal tubes (one smooth tube and two doubly enhanced ones) was conducted at the refrigerant saturation temperature of 404C. The object of study was to reveal the condensation heat transfer on the outsides of smooth tube, two dimensional enhanced tube and three dimensional enhanced tube, respectively, and the possibility of using R417A as substitution for R22. A modified Wilson plot was used to obtain the water-side and vapor-side heat transfer coefficients. The results show that the predicted condensation heat transfer coefficients of R22 on smooth tube calculated by Nusselt theory agree well with the experimental data within ?%. Condensation heat transfer coefficients of R417A are about 65% of those of R22 for smooth tube. Meanwhile, the condensation heat transfer coefficients of R417A are 50.8%~60.0% and 31.7%~42.7% of those of R22 on the outsides of the tubes C32 and C36, respectively. For R22, the condensation heat transfer coefficients on C36 are 1.27-1.44 times higher than those on C32 with the same fin density. For R417A, the condensation heat transfer coefficients on C32 are slightly higher than those on C36. This indicate that, using three dimensional enhanced tube can not further enhance the condensation heat transfer of using two dimension ones for non-azeotropic mixtures of R417A.关键词
强化管/非共沸工质/R417A/凝结换热Key words
enhanced tubes/ non-azeotropic mixtures/ refrigerant 417A/ condensation heat transfer分类
能源科技引用本文复制引用
张定才,赵安利,田松娜,范晓伟,杜佳迪..R417A和R22在光管和强化管外的凝结换热特性比较[J].高校化学工程学报,2012,26(4):587-592,6.基金项目
河南省科技攻关项目(112102310673) （112102310673）
河南省高等学校青年骨干教师资助计划(2011GGJS-114). （2011GGJS-114）
