Article

Journal of Zhejiang University SCIENCE A

, Volume 10, Issue 11, pp 1678-1682

Experimental investigation of an adjustable ejector for CO2 heat pump water heaters

  • Guang-ming ChenAffiliated withState Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and Cryogenics, Zhejiang University
  • , Li-xia LiangAffiliated withState Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and Cryogenics, Zhejiang University
  • , Li-ming TangAffiliated withState Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and Cryogenics, Zhejiang University Email author 
  • , Xiao-xiao XuAffiliated withState Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and Cryogenics, Zhejiang University
  • , Zhi-jiang ZhuAffiliated withState Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and Cryogenics, Zhejiang University
  • , Qi ChenAffiliated withState Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and Cryogenics, Zhejiang University

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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

CLC number

TK5