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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2009, Vol. 10 Issue (11): 1678-1682    DOI: 10.1631/jzus.A0920116
Chemical and Energy Engineering     
Experimental investigation of an adjustable ejector for CO2 heat pump water heaters
Guang-ming CHEN, Li-xia LIANG, Li-ming TANG, Xiao-xiao XU, Zhi-jiang ZHU, Qi CHEN
State Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China
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Abstract  An adjustable ejector expansion device for a CO2 heat pump water heater (HPWP) is proposed to improve the system performance. It has been designed to investigate experimentally the effects of the motive nozzle throat area of the ejector, entrained flow pressure, back pressure and primary flow pressure on the entrainment ratio. Experiments based on different motive nozzle throat areas were conducted and the results of the prototype ejector using CO2 as working fluid are presented. The results show that an adjustable ejector can achieve high performance and work well in a wide range of working conditions.

Key words： Adjustable ejector      System performance      CO2 heat pump water heater (HPWH)      Entrainment ratio     
Received: 08 April 2009     
CLC:  TK5  
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Li-ming TANG
Xiao-xiao XU
Guang-ming CHEN
Li-xia LIANG
Zhi-jiang ZHU
Qi CHEN
Cite this article:

Guang-ming CHEN, Li-xia LIANG, Li-ming TANG, Xiao-xiao XU, Zhi-jiang ZHU, Qi CHEN. Experimental investigation of an adjustable ejector for CO2 heat pump water heaters. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2009, 10(11): 1678-1682.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0920116     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2009/V10/I11/1678

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