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

Authors

  • Guang-ming Chen
    • State Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and CryogenicsZhejiang University
  • Li-xia Liang
    • State Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and CryogenicsZhejiang University
    • State Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and CryogenicsZhejiang University
  • Xiao-xiao Xu
    • State Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and CryogenicsZhejiang University
  • Zhi-jiang Zhu
    • State Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and CryogenicsZhejiang University
  • Qi Chen
    • State Key Laboratory of Clean Energy Utilization, Institute of Refrigeration and CryogenicsZhejiang University
Article

DOI: 10.1631/jzus.A0920116

Cite this article as:
Chen, G., Liang, L., Tang, L. et al. J. Zhejiang Univ. Sci. A (2009) 10: 1678. doi:10.1631/jzus.A0920116

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 ejectorSystem performanceCO2 heat pump water heater (HPWH)Entrainment ratio

CLC number

TK5
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Copyright information

© Zhejiang University and Springer Berlin Heidelberg 2009