Influence of the Refrigerant Charge on the Heat Transfer Performance for a Closed-Loop Spray Cooling System

Nianyong Zhou, Hao Feng, Yixing Guo, Wenbo Liu, Haoping Peng, Yun Lei, Song Deng and Yu Wang
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Nianyong Zhou: College of Petroleum Engineering and Energy, Changzhou University, Changzhou 213164, China
Hao Feng: College of Petroleum Engineering and Energy, Changzhou University, Changzhou 213164, China
Yixing Guo: College of Petroleum Engineering and Energy, Changzhou University, Changzhou 213164, China
Wenbo Liu: College of Petroleum Engineering and Energy, Changzhou University, Changzhou 213164, China
Haoping Peng: College of Petroleum Engineering and Energy, Changzhou University, Changzhou 213164, China
Yun Lei: College of Petroleum Engineering and Energy, Changzhou University, Changzhou 213164, China
Song Deng: College of Petroleum Engineering and Energy, Changzhou University, Changzhou 213164, China
Yu Wang: College of Urban Construction, Nanjing Tech University, Nanjing 210009, China

Energies, 2021, vol. 14, issue 22, 1-15

Abstract: With the rapid increase of heat flux and demand for miniaturization of electronic equipment, the traditional heat conduction and convective heat transfer methods could not meet the needs. Therefore, the spray cooling experiment was carried out to obtain the basic heat transfer and cooling process. In this experiment, the spray cooling system was set up to investigate the influence of refrigerant charge on heat transfer performance in steady-state, dynamic heating, and dissipating processes. In a steady-state, the heat transfer coefficient increased with the rise of the refrigerant charge. In the dynamic dissipating process, both heat flux and heat transfer coefficient decreased rapidly after the critical heat flux, and the surface temperature drop point of each refrigerant charge was presented. The optimum refrigerant charge was provided considering the cooling parameters and the system operating performance. When the refrigerant operating pressure was 0.5 MPa, the spray cooling process presented with the higher heat flux, heat transfer coefficient, and cooling efficiency in this experiment. Meanwhile, the suitable surface temperature drop point and more gentle heat flux curves in the nucleate boiling region were obtained. The research results will contribute to the spray cooling system design, which should be operated before departure from the nucleate boiling point for avoiding cooling failure.

Keywords: spray cooling; refrigerant charge; surface temperature drop point; heat transfer performance (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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