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Seasonal performance of on-off air-to-water heat pumps.
Author(s) : BENSAFI A., MONDOT M., RIVIERE P.
Summary
With increasing energy costs, it is essential to be able to predict the annual electricity consumption of heat pumping equipment to compare different systems on a fair basis. Since changes in outdoor conditions and building load affect the heat pump performance, measurement of part-load COP at varied outdoor conditions is necessary. In Europe, Eurovent Certification implemented in 2006 a certification scheme to calculate a European Seasonal Energy Efficiency Ratio for staged capacity chillers. It is expected that such a certification scheme be extended to heat pumping equipment. This paper shows the testing methodology and the results obtained on an on-off air-to-water heat pump (8 kW rated capacity), which was tested at full load as well as part-load conditions (from 90 to 25%) with outdoor conditions varying from -7 to 12°C. The test results show that the heat pump COP changed in a different manner depending on the outdoor conditions. The pattern of change was the same for outdoor temperatures above 7 and below 0°C. In these two temperature domains, the part-load COP can be related to full load COP following a unique relationship, with a deterioration in performance attributed mainly to stand-by losses under cycling conditions. However, there exists an outdoor temperature domain (roughly between 1 and 6°C) for which part-load COP was found to be higher than full load COP, despite cycling. Consequences for the set-up of a simplified heating seasonal performance factor based on a reduced number of full load tests and either a simplified performance curve at part load or supplementary part-load test are discussed.
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Pages: ICR07-E2-884
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Details
- Original title: Seasonal performance of on-off air-to-water heat pumps.
- Record ID : 2008-0858
- 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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