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Effects of airflow maldistribution on the performance of an air-to-water heat pump under frosting conditions.

Author(s) : GONG J. Y., YUAN X. L., HU W. X., et al.

Summary

The effects of airflow maldistribution on the performance of an air-to-water heat pump system under frosting conditions were investigated experimentally. Different airflow distributions were experimented on a 50 kW unitary air-to-water heat pump. The results indicated that the airflow maldistribution was the dominant factor leading to the hunting of the thermostatic expansion valve for medium and/or large size finned tube evaporators. In stable stage, with airflow maldistribution degree (AMD) increasing, frosting was quickened and the system stable working time was shortened. The refrigeration system operating characteristics were lowered accordingly. The authors found the phenomenon seemed to be related to both the difference of refrigerant outlet temperature superheat and the frosting velocity. In hunting stage, with AMD increasing, the heat pump system pertinent performance data (suction pressure, evaporation temperature, discharge pressure, refrigerant outlet temperature, etc.) were degraded more dramatically.

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Pages: ICR07-E2-1618

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Details

  • Original title: Effects of airflow maldistribution on the performance of an air-to-water heat pump under frosting conditions.
  • Record ID : 2008-0860
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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