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6 – Modelling Hot Water Heating Only (DHW Mode) Figure 6.14 shows the simulated temperature profiles of the supercritical CO2 and the water flows in the tripartite gas cooler at optimum high-side pressure in the DHW mode. The gas cooler geometry and the operating conditions were the same as for the prototype CO2 heat pump unit (ref. Sections 4.1 and 5.1). 120 100 80 60 40 20 0 57.2 70.0 49.4 1.0 CO2 Isobar DHW-Preheating DHW-Reheating 57.2 49.4 104.3 7.3 5.0 Qtot: 7.4 kW COP: 3.58 PGC: 10 MPa 0.0 0.2 0.4 0.6 0.8 Relative Gas Cooler Length [-] Figure 6.14 The simulated temperature profiles for the tripartite CO2 gas cooler at optimum high-side pressure and 70oC hot water temperature in the DHW mode. Due to the relatively large high-side pressure, there was no pinch-point2 inside the gas cooler units that hampered the heat transfer process, and the temperature approach at the cold end of the DHW preheating gas cooler unit was about 2.3 K. The temperature curves were diverging at the hot end of the DHW reheating gas cooler, since the CP-value of the water flow was larger than that of the CO2 flow. Despite the relatively small heat transfer surface, about 30% of the heat was given off in the DHW reheating gas cooler unit. This was a result of the larger mean temperature difference than that of the DHW preheating gas cooler unit. 2 The minimum temperature difference between the hot and the cold flow in a counter-flow gas cooler occurs at the pinch point. 188 Temperature [°C]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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