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Appendix A – CO2 as a Working Fluid in Heat Pumps 0.20 0.15 0.10 0.05 0.00 -20 -10 0 10 20 30 40 50 Temperature [°C] R134a R290 R407C R410A CO2 Figure A3 Table A3 Property Thermal conductivity Dynamic viscosity Specific heat capacity Density CO2 R-290 1.0 0.95 1.0 0.72 1.0 1.24 1.0 0.53 1.0 1.01 1.0 0.83 1.0 0.53 1.0 0.10 1.0 5.04 1.0 1.92 R-407C R-410A R-134a The slope of the saturation pressure curve (∂T/∂p) for CO2, propane and selected HFCs (RnLib, 2003). Average relative values of thermophysical properties at satu- rated state for CO2, propane (R-290) and selected HFCs for the temperature range from -10 to +10oC (RnLIb, 2003). Ratio of liquid/vapour density Surface tension liquid liquid vapour liquid vapour liquid vapour liquid vapour 0.87 0.90 0.86 0.59 0.61 0.53 1.98 1.59 2.65 0.81 0.82 0.88 0.56 0.60 0.51 0.42 0.56 0.46 1.33 1.27 1.40 0.19 0.31 0.15 6.98 4.08 9.58 1.82 1.60 2.04 Table A4 presents some examples of measured heat transfer coefficients for flow boiling CO2 in horizontal round tubes (RT) and microchannel tubes (MPE) for automotive and residential applications. A6 dT/dP [K/kPa]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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