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A field study on frosting suppression for air source heat pumps by adjusting operation strategies of multi-parallel compressors.

Number: pap. n. 1158

Author(s) : LIANG S. M., ZHANG S. Q., WANG W., et al.

Summary

Frosting is an unavoidable problem for air source heat pumps, especially in high humidity environment. It is necessary to develop efficient method for frosting suppression as well as defrosting. In this study, frosting suppression was achieved by adjusting the operation strategies of multi-parallel compressors. Field tests were conducted in Guiyang, China, where the average relative humidity in winter is over 80%. Two ASHP units with four fixed-speed compressors were chosen as comparing samples. Two operation strategies were compared for the frosting suppression performances of the units at part load. Test results shown that operation strategies can significantly affect the frosting suppression performance of the ASHPs. By optimizing the operation strategies, the frosting rate and the frosting-defrosting loss efficiency decreased by 38 % ~ 39 % and 31 % ~ 34 % thus leading to the heating efficiency and COP improving about 14 % ~ 22 % and 5 % ~ 14 %, respectively.

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Pages: 8

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Details

  • Original title: A field study on frosting suppression for air source heat pumps by adjusting operation strategies of multi-parallel compressors.
  • Record ID : 30026517
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1158

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