Residential CO2 Heat Pump System for Combined

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Residential CO2 Heat Pump System for Combined ( residential-co2-heat-pump-system-combined )

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1) The mean of the bubble point and dew point has been used as the datum temperature 2) Condensation temperature at 3.5 MPa for R-410A Figure 2.3 shows a typical design of a residential brine-to-water heat pump. 2 – Technological Status Table 2.2 Important physical and thermophysical properties for work- ing fluids used in residential brine-to-water and water-to- water heat pump units (RnLib, 2003). Property Normal boiling point [oC] Critical temperature [oC] Critical pressure [MPa] Condensation temp. at 2.5 MPa [oC] Volumetric heating capacity at 0°C [kJ/m3] R-290 R-407C -42.1 -43.81 96.8 87.3 4.25 4.63 67.6 60.1 3880 4115 R-410A R-134a -51.6 -26.2 72.5 101.1 4.95 4.07 56.12 77.6 6737 2866 E TEV Pressostats XP P SC C Figure 2.3 E: Evaporator (PHE) C: Condenser (PHE) SC: Scroll compressor TEV: Thermostatic expansion valve P: Pump X: Expansion tank Typical design of a residential brine-to-water heat pump unit. Recent test results from the heat pump test stations at 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 coefficient of performance (COP) of about 4.6 and 3.3 at inlet brine temperatures and outlet water temperatures of 0/35oC and 0/50°C, respectively. Reference is made to Appendix B, Performance Testing of Residential Brine-to-Water and Water-to-Water Heat Pumps, for further details regarding performance testing of this kind of heat pump units. 13

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