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Appendix A – CO2 as a Working Fluid in Heat Pumps 10 4 2 1 0.4 0.1 Figure A1 31.1°C, 7.38 MPa critical point 0°C 40°C HFC-134a -103.3°C 0.0004 MPa -56.6°C 0.518 MPa triple point 40°C 0°C Carbon dioxide (CO2) triple point 101.1°C, 4.07 MPa critical point Comparison of the pressure-enthalpy diagrams for R-134a (HFC-134a) and CO2 (RnLib, 2003). Figure A2 illustrates the transcritical CO2 heat pump cycle in a pressure- enthalpy diagram. Specific enthalpy (kJ/kg) 10 31.1°C 7.38 6 4 2 Figure A2 0°C 20°C 40°C 60°C 80°C supercritical heat rejection 32 4 1 Specific enthalpy (kJ/kg) subcritical evaporation Principle of the transcritical CO2 cycle: 1-2 compression, 2-3 supercritical heat rejection with temperature glide, 3-4 throttling, and 4-1 subcritical evaporation. A3 Pressure (MPa) Pressure (MPa)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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