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Charge minimization in a 30kW air to water heat pump.

Number: pap. ID155

Author(s) : PALM B.


Modern manufacturing technology allows production of tubes and channels with small hydraulic diameters. Heat pumps and refrigeration equipment designed using such tubes may have considerably lower charge than conventional systems while having just as good thermal performance. In this paper, the possibilities of charge reduction are investigated, using a 30 kW propane air to water heat pump as an example. It is shown that changing the tubing in the evaporator and condenser is a vital first step, but that considerable additional charge reduction can be reached by careful consideration in the selection and designs of other parts of the system as well. In particular it is important to avoid headers where liquid may be trapped and oversized receivers. Additionally, in a well-designed system a substantial part of the refrigerant may be absorbed in the compressor oil. Reducing the amount of refrigerant in this component requires novel thinking concerning the compressor design.

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Pages: 8 p.


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  • Original title: Charge minimization in a 30kW air to water heat pump.
  • Record ID : 30012404
  • Languages: English
  • Source: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2014). Proceedings. Hangzhou, China, August 31-September 2, 2014.
  • Publication date: 2014/08/02


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