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Appendix B – Performance Testing of Heat Pumps WPZ Töss is the only European test station that presents updated test results at their Internet homepage (www.wpz.ch). Figure B1 shows the range of the measured coefficient of performance (COP) at various operating conditions for brine-to-water (B/W) and water-to-water (W/W) heat pumps with heating capacities between 5 and 10 kW. The tempe- ratures before and after the slash represent the inlet fluid temperature to the evaporator and the outlet water temperature from the condenser, respectively. 6,0 5,5 5,0 4,5 4,0 3,5 3,0 2,5 2,0 7,0 6,5 6,0 5,5 5,0 4,5 4,0 3,5 3,0 B5/W35 B0/W35 B-5/W35 B5/W50 B0/W50 B-5/W50 W15/W35 W10/W35 W15/W50 W10/W50 COP for residential brine-to-water (B-W) and water-to- water (W-W) heat pumps tested at WPZ Töss. Figure B1 The highest COPs are achieved for the heat pump units having a heating capacity between 8 and 10 kW. Oostendorp and Traversari (2000) have compared the COP for residential brine-to-water and water-to-water heat pumps tested at TNO-MEP during the period 1998 to 2000. The results are presented in Figure B2 and B3. The test results from WPZ Töss and TNO-MEP demonstrates that the most energy efficient residential brine-to-water heat pumps on the market in the capacity range from about 5 to 7 kW achieve a COP of about 4.6 and 3.3 at B/W 0/35oC and 0/50°C, respectively. There exists no standards or acknowledged guidelines for estimating the seasonal performance factor (SPF) of residential brine-to-water and water- to-water heat pump systems. However, some research organisations have developed software to predict the SPF of various types of heat pump systems. As an example, TNO-MEP have made a dynamic heat pump B2 COP [-]PDF Image | Residential CO2 Heat Pump System for Combined
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