Heat transfer enhancement and pressure drop performance for R417A flow boiling in internally grooved tubes

被引：31

作者：

Zhang, Xiaoyan ^{[1
]}

Zhang, Jin ^{[1
]}

Ji, Haiwei ^{[1
]}

Zhao, Dengyu ^{[1
]}

机构：

[1] Xian Univ Sci & Technol, Inst Energy Engn, Xian 710054, Peoples R China

来源：

ENERGY | 2015年 / 86卷

关键词：

R417A; Flow boiling; Heat transfer; Pressure drop; Enhancement; Internally grooved tube; TRANSFER COEFFICIENTS; HORIZONTAL SMOOTH; R407C; REFRIGERANTS; EVAPORATION; MIXTURES; R22; R-410A; PURE; HERRINGBONE;

D O I：

10.1016/j.energy.2015.04.054

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The experimental study on heat transfer and pressure drop for R417A flow boiling in horizontal smooth and internally grooved tubes was conducted. Based on the experimental results, heat transfer and pressure drop performance for R417A in different tubes were compared, and the influences of vapor quality and mass flux on heat transfer enhancement and pressure drop performance were analyzed and discussed. The result indicates: enhancement factors of R417A in Tube II and Tube III focus on a range of 1.26-2.0 and 1.5-2.8 respectively, and enhancement factors vary with vapor qualities and mass fluxes. The total pressure drops for R417A in Tube II and Tube III are 1.8-2.6 times and 1.67-2.3 times of R417A in smooth tube respectively. Both enhancement factor and penalty factor increase with increasing mass flux, while enhancement parameters show different situations in different internally grooved tubes. Compared with Tube II, Tube III possesses a better heat transfer enhancement efficiency. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：446 / 454

页数：9

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