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A simple method for the determination of SPF of heat pumps used in single-family dwellings.

Author(s) : DUMONT E., DUPREZ M. E., FRERE M.

Summary

The estimation of seasonal performance factor (SPF) of heat pumps is still not an easy task. Several simple methods have been developed in the past but they usually give non accurate values. These discrepancies can be due to the method itself because the COP of the heat pump is not a linear function of the source and sink temperatures, or because the calculation is based on manufacturer performance charts of the heat pump, which, according to our experience, are never the real performance as determined by on site measurements. The authors present a simple method based on month-average performance of the heat pump. Firstly, they show that month-average quantities give the same results as the experimental ones (error less than 0.7%). They then define a month-average thermodynamic cycle which represents all the experimental cycles of the month. Secondly, the authors develop a model to predict the characteristics of the month-average cycle. These can be correlated to experimental values measured on the system. The total running time of the heat pump for each month can be obtained when the heat loss curve of the dwelling is available. The model predicts an SPF value close to the experimental one (error less than 1%).

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Pages: ICR07-E2-1225

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Details

  • Original title: A simple method for the determination of SPF of heat pumps used in single-family dwellings.
  • Record ID : 2008-0911
  • 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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