Experimental Investigation of Spray Cooling System in a Closed Loop Based on Refrigeration Cycle

Spray cooling is an efficient method of heat exchange which has prominent prospects for development. Its main advantages are the high cooling capacity of unit mass fluid, the low flow rate in the system, the uniformity of temperature distribution on the surface and the strong stability of system. A closed-loop spray cooling system based on refrigeration cycle using R134-a as working fluid was built in this paper. The cooling performance under varied mass flow rate, chamber pressure and heat flux was studied. The results of spray cooling experiments showed that it has excellent heat transfer capability and the maximum critical heat flux (CHF) reached 130 W/cm2 while the surface temperature could be controlled below 45℃ in the meantime, which could ensure the stable and efficient operation of electronic devices. In addition, there is an optimal value of the refrigerant flow rate and the chamber pressure for heat transfer, and the heating surface superheat degree has a significant effect on the cooling efficiency. © 2018, Science Press. All right reserved.