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Effect of fan speed on the performance of a heat pump adopting the hot gas bypass method.

Author(s) : BYUN J. S., HUR J. W., LEE J., et al.

Summary

The study investigates experimentally the effects of outdoor coil fan speed on the performance of heat pump adopting hot gas bypass method. Although the hot gas bypass method can retard frost growth, the heat pump system becomes instable as mass flow rate and conditions of refrigerant which flows into compressor change rapidly. To reduce the instability of the heat pump system, the fan speed of the outdoor coil is controlled according to frost growth and refrigerant conditions. Tests were made for fan speeds of outdoor coil controlled at 90, 60 and 30% of normal speed together with the case of stationary fan. Performance of heat pump is compared for variables such as COP, total heat capacity, and total heating time during 200 minutes heating mode. Results show that the integrated heating capacity is highest at 60% (780 rpm) of the fan speed and the value is 46% higher than that of the stationary fan. The averaged COP of the heat pump in this case is higher only by 2.7% than that of the stationary fan.

Details

  • Original title: Effect of fan speed on the performance of a heat pump adopting the hot gas bypass method.
  • Record ID : 2007-0858
  • Languages: English
  • Source: ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
  • Publication date: 2006/05/21

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