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3rd Thermal and Fluids Engineering Conference (TFEC)

ISSN: 2379-1748

EXPERIMENTAL INVESTIGATION OF THE PERFORMANCE OF REFRIGERANT R134A WORKING IN A SPRAY COOLING

Nabeel M. Abdulrazzaq
University of South Carolina, Department of Mechanical Engineering, 300 Main Street, Columbia, SC 29208, USA

Noble C. Anumbe
University of South Carolina, Department of Mechanical Engineering, 300 Main Street, Columbia, SC 29208, USA

Jamil A. Khan
Department of Mechanical Engineering, Laboratory for Applied Heat Transfer, University of South Carolina, Columbia, SC 29208, USA

DOI: 10.1615/TFEC2018.hte.021658
pages 1355-1368


KEY WORDS: Spray cooling, R134a, Refrigerant, Refrigeration system.

Abstract

Heat transfer performance of refrigerant R134a was studied during spray cooling. The effect of the nozzle-to-surface distance on the overall heat transfer performance has been experimentally investigated in this paper. A plain circular horizontal copper surface heated by a cartridge heater was cooled by refrigerant R134a flowing through the nozzle in a spray chamber. Experimental spray chamber is integrated into a single stage refrigeration system. Several experiments were performed with different nozzle inlet pressure to determine the effect of the nozzle-to-surface distance on the critical heat flux and the heat transfer coefficient in a spray cooling at elevated pressures. It was found that the nozzle-to-surface distance has a significant effect on the spray coverage area of the surface that has a direct effect on the critical heat flux and the heat transfer coefficient. The results showed that as the distance between the nozzle and the surface increased the critical heat flux and the heat transfer coefficient increase. The maximum heat flux observed in the experiment was 136.8 W/cm2, and the maximum heat transfer coefficient was 48.8 kW/m2.K when the nozzle-to-surface distance and the nozzle inlet pressure were 23mm and 8 bar respectively.

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