Experimental study of impingement spray cooling for high power devices |
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| Authors: | ZB Yan KC Toh F Duan TN Wong KF Choo PK Chan YS Chua |
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| Affiliation: | 1. School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore;2. Temasek Laboratory @ NTU, Singapore;3. DSO Laboratories, Singapore;1. Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, PR China;2. Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, PR China;1. College of Petroleum Engineering, Changzhou University, 213164 Changzhou, Jiangsu, China;2. College of Urban Construction, Nanjing Tech University, Nanjing 210009, China;1. Department of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. School of Mechanical Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea;1. POLO Research Laboratories for Emerging Technologies in Cooling and Thermophysics, Department of Mechanical Engineering, Federal University of Santa Catarina (UFSC), Florianópolis, SC 88040900, Brazil;2. Whirlpool Latin America, Technology Center, Joinville, SC 89219900, Brazil |
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| Abstract: | An experimental study of a closed-loop impingement spray cooling system to cool a 1 kW 6U electronic test card has been conducted. The system uses R134a as working fluid in a modified refrigeration cycle. The spray from four vapor assisted nozzles is arranged to cover a large ratio of the heated area of the card. Investigations are currently focused on effects of mass flow rate, nozzle inlet pressure and spray chamber pressure. Experimental results are promising with a stable average temperature of around 23 °C being maintained at the heated surface, and maximum temperature variation of about 2 °C under suitable operating conditions. Heat transfer coefficients up to 5596 W/m2 K can be achieved with heat flux input around 50,000 W/m2 in this study. It is found that cooling performance improved with increasing mass flow rate, nozzle inlet pressure and spray chamber pressure, whereas uniformity of the heated surface temperature can only be improved with higher mass flow rate and nozzle inlet pressure. The mechanisms for the enhanced performance are also presented. |
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