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Residential ground-source heat pump systems: results from a field study in Sweden.

Author(s) : STENLUND M., AXELL M.

Summary

The situation on the Swedish market for ground-source heat pumps is characterized by high and increasing energy prices, high sales volumes, relatively high initial costs (purchase and installation etc.). To maintain the public acceptance for the technology and to ensure a continuous positive development of the market, efficient and reliable systems are of great importance. The main objectives of this study were to evaluate the efficiency of the GSHP-systems and to record the experiences of the end users. Questionnaires were sent to 450 domestic end users who had installed GSHP-systems in the period 1996-2003. The study focused on systems designed for single family houses reflecting the current market in Sweden and the vast majority were retrofits, where the heat pump system replaced old boilers or similar, with vertical ground-source heat exchangers. From the questionnaire, 25 systems were inspected more in detail by means of interviews and ocular inspections. The study was concluded with measurements during 12 months, on five selected systems of different designs, age and size. The measurements incorporated data necessary to evaluate the system performance factor. The study showed that a great majority (98%) of the end-users were satisfied with their systems and that a relatively low number of serious malfunctions (such as compressor failures) occur. Dissatisfaction was often the result of mistakes relating to the installation rather than the system itself, or its operation. The measurements revealed an average system performance factor of 2.6 incl. auxiliary heating.

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Pages: ICR07-E2-1018

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Details

  • Original title: Residential ground-source heat pump systems: results from a field study in Sweden.
  • Record ID : 2008-1000
  • Languages: English
  • Subject: Figures, economy
  • 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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