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5 – Experimental Results The COP vs. the Evaporation Temperature Figure 5.37 shows the measured COP for the CO2 heat pump unit at varying evaporation temperature and 35/30oC supply/return temperatures for the space heating system. At -10oC evaporation temperature, the CO2 mass flow rate was 1.21 kg/min ±2% and the suction gas superheating was 4.8 K ±0.5 K. At 0oC evaporation temperature the corresponding numbers were 1.63 kg/min ±0.3% and 4.5 K ±0.5K. 3.5 3.0 2.5 2.0 7.5 8.0 8.5 9.0 9.5 10.0 Gas Cooler Pressure [Mpa] 2.78 3.18 3.01 0°C -5°C -10°C Figure 5.37 The measured COP at varying evaporation temperature and 35/30oC supply/return temperatures for the SH system. The COP curves were relatively flat around the optimum high-side pressure, and the optimum high-side pressure was rather invariable with the evaporation temperature. The COP decreased on average by approxi- mately 1.3% per K drop in the evaporation temperature, which is the same order of magnitude as in the combined mode. 5.1.3.5 Comparison of the Measurements in the Different Heating Modes The Coefficient of Performance (COP) Figure 5.38 compares the maximum COPs at the optimum high-side pressures for the three heating modes at varying hot water temperature and supply/return temperatures for the space heating system. Since the maximum COP at 80oC hot water temperature in DHW mode could not be experimentally determined due to pressure limitations for the CO2 heat pump unit, the value was estimated to be about 3.20. 142 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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