Evaluation of R404a single loop thermosyphon for shaft cooling in motorized spindle

被引：23
作者：
Li, Fajing
Gao, Jianmin
Shi, Xiaojun [1 ]
Xu, Liang
Zhu, Ke
机构：
[1] Xi An Jiao Tong Univ, State Key Lab Mfg Syst Engn, 28 Xianning West Rd, Xian 710049, Shaanxi, Peoples R China
来源：
APPLIED THERMAL ENGINEERING | 2018年 / 142卷
基金：
中国国家自然科学基金;
关键词：
Single loop thermosyphon; Shaft cooling; Zeotropic mixed refrigerant; SOLAR WATER-HEATER;
D O I：
10.1016/j.applthermaleng.2018.06.072
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In this study, a single loop thermosyphon charged with refrigerant R404a was investigated for shaft cooling in a motorized spindle. Tests were performed for a heating power range of 20-200 W, evaporation temperatures between 20 degrees C and 72 degrees C, and filling ratio (FR) of 30-80%. Effects of zeotropic mixed refrigerant R404a on heat transfer performance and optimal FR were analyzed and compared with those of pure refrigerants R134a and R600a. Results indicated that R404a single loop thermosyphon has a higher heat transfer efficiency and smaller thermal resistance than those charged with R134a and R600a when the temperature of evaporation is below 57 degrees C. Due to changes in R404a components during the injection process, the minimum average thermal resistance of R404a single loop thermosyphon (0.41 degrees C/W) appears at 50% < FR < 60%, compared to 30% < FR < 50% for pure refrigerant.
引用
收藏
页码：262 / 268
页数：7
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