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5 – Experimental Results 4.0 3.5 3.0 2.5 0 5 10 15 20 25 30 Temperature Approach [K] 33/28°C, 80°C 35/30°C, 80°C 40/35°C, 80°C Figure5.21 The measured COP as a function of the temperature approach at 80oC DHW temperature and varying supply/- return temperatures for the SH system. The COP vs. the Evaporation Temperature Figure 5.22 shows the measured COP for the CO2 heat pump unit at varying evaporation temperature, 60oC hot water temperature and 35/30oC supply/return temperatures for the space heating system. At -10oC evaporation temperature (2.649 MPa), the suction gas superheating was 2.1 K ±0.5 K, the CO2 mass flow rate was 1.22 kg/min ±1.5% and the inlet city water temperature was 6.5oC ±0.6oC. Unfortunately, the test at 0oC evaporation temperature had to be cancelled due to operational problems (leakage) and consequent plant shut-down. By changing the evaporation temperature from -5oC to -10oC, the mass flow rate dropped off by 15%, whereas the optimum high-side pressure decreased from 8.5 to 8 MPa. Since the measurements were carried out at 0.5 MPa intervals, the indicated optima for the high-side pressures should only be regarded as approximate values. At optimum high-side pressure, the total heating capacity of the tripartite gas cooler and the power input to the compressor dropped off by approximately 11% and 5%, respectively, resulting in a 6% lower COP at -10°C evaporation temperature. The DHW heating capacity ratio of the heat pump unit was virtually unaffected by the evaporation temperature. 129 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
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