期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 66, 期 -, 页码 206-212出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2015.03.015
关键词
Refrigerants spray cooling; R134-a; R22; Heat transfer characteristics
资金
- National Nature Science Foundation of China [51406160]
- Shaanxi International Science and Technology Cooperation Projects [2014KW09-01]
- China Postdoctoral Science Foundation [2014M560773]
Spray cooling is one of the promising technologies in heat removing for high power density equipment, especially for the equipment with high heat flux surface. R134-a is one of the most prospective alternative refrigerants of R22 due to the zero ODP, low GWP, non-toxicity and non-inflammability, it is necessary to do comparative study on the heat transfer characteristics of R22 and R134-a in spray cooling. In this article, two closed loop spray cooling test rigs with the same spray nozzle are established to investigate the thermal performance of R22 spray cooling and R134-a spray cooling. The main parameters such as critical heat flux (CHF), heat transfer coefficient and target surface temperature are compared in the same thermal condition. The CHF of R134-a spray is lower due to the lower latent heat. The heat transfer coefficient of R22 spray is higher than that of R134-a spray with the same spray chamber pressure. However, R134-a spray cooling could replace R22 spray cooling in the phase change heat transfer region when the heat flux is less than 80W cm(-2). (C) 2015 Elsevier Inc. All rights reserved.
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