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Appendix A – CO2 as a Working Fluid in Heat Pumps 5 4 3 2 1 10°C 20°C 32°C 30°C 34°C 36°C 40°C Variable CO2 outlet temperature 7.0 7.5 8.0 8.5 9.0 9.5 10.0 10.5 11.0 Supercritical Pressure [MPa] Figure A13 The calculated COP for a transcritical CO2 heat pump cycle as a function of the high-side pressure and the CO2 outlet temperature from the gas cooler. The boundary conditions are as in Figure A10. Figure A14 shows the optimum high-side pressure at varying evaporation temperatures. The boundary conditions are the same as in Figures A10 and A11, with the exception that the isentropic compressor efficiency is a function of the pressure ratio (i.e. real compressor data). 11 10 9 8 7 FigureA14 -10°C 0°C +10°C Variable evaporation temperature 30 32 34 36 38 40 CO2 Outlet Temperature [°C] The calculated optimum high-side pressure for a trans- critical CO2 heat pump cycle as a function of the CO2 outlet temperature from the gas cooler and the evaporation temperature. The boundary conditions are as in Figure A10. A17 Optimum Pressure [MPa] COP [-]PDF Image | Residential CO2 Heat Pump System for Combined
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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