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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, 60°C 35/30°C, 60°C 40/35°C, 60°C Figure5.19 The measured COP as a function of the temperature approach at 60oC DHW temperature and varying supply/- return temperatures for the SH system. 4.0 3.5 3.0 2.5 0 5 10 15 20 25 30 Temperature Approach [K] 33/28°C, 70°C 35/30°C, 70°C 40/35°C, 70°C Figure5.20 The measured COP as a function of the temperature approach at 70oC DHW temperature and varying supply/- return temperatures for the SH system. According to Figure 5.20, the temperature approaches at 35/30°C were higher than that of the 33/28oC measuring series. The most likely expla- nation to this inconsistent result is that the optimum high-side pressure in reality was between 8.5 and 9 MPa and not at the measuring point of 8.5 MPa, since a slightly elevated high-side pressure would have lowered the temperature approach and increased the COP of the heat pump. 128 COP [-] 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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