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Some modelling improvements for unitary air conditioners and heat pumps at off-design conditions.

Author(s) : SHEN B., BRAUN J. E., GROLL E. A.

Summary

Models for unitary air conditioners and heat pumps typically have difficulties in providing accurate predictions for the following situations: 1) charge modelling over a large range of charge levels; 2) two-phase refrigerant entering fixed-orifice expansion devices; 3) two-phase refrigerant entering compressors; and 4) non-uniform refrigerant mass flow allocation among evaporator circuits at low indoor air flow rates. This paper provides a detailed evaluation of the impact of non-uniform refrigerant mass flow allocation among evaporator circuits on performance predictions. In addition, it gives brief descriptions and overall assessments of improved modelling methodologies for the other three issues. The study utilizes data obtained from extensive testing at a wide range of operating conditions for two R-410A units and one R-407C unit.

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Details

  • Original title: Some modelling improvements for unitary air conditioners and heat pumps at off-design conditions.
  • Record ID : 2008-2207
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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