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Designing a heat pump for minimum charge of refrigerant.

Author(s) : PALM B., FERNANDO P., ANDERSSON K., et al.

Summary

Independently of which refrigerants will be used in the future there are strong incentives to reduce the charge of refrigerant in each system. This paper reports on results from a project aiming at reducing the charge of refrigerant in a 5 kW liquid to liquid heat pump (heating only) to 150 g of propane. First, the fluid inventory in each part of the heat pump was determined. As a result, the main effort has been on redesigning the heat exchangers using minichannel tubes. At the present time, the system operates with about 200 g of propane. Further decrease of the charge is possible by redesigning the condenser and by reducing the amount of propane in the compressor, either by using oils in which propane is not soluble or by using compressors with low charge of oil. The designs suggested may open up for the safe use of flammable refrigerants with high energy efficiency such as R152a, R32, R290 and R600a.

Details

  • Original title: Designing a heat pump for minimum charge of refrigerant.
  • Record ID : 2006-3193
  • Languages: English
  • Source: 8th IEA Heat Pump Conference 2005: global advances in heat pump technology, applications, and markets. Conference proceedings [CD-ROM].
  • Publication date: 2005/05/02

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