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5 – Experimental Results 100 80 60 40 20 0 02468 Heating Capacity [kW] 8.0 MPa SH: 35/30oC DHW: 60oC pinch ∆TA A C B COP 3.67 100 80 60 40 20 0 02468 Heating Capacity [kW] 7.5 MPa SH: 35/30oC DHW: 60oC ∆TA A pinch C B COP 2.93 100 80 60 40 20 0 02468 Heating Capacity [kW] 8.5 MPa – maximum COP SH: 35/30oC DHW: 60oC A C B COP 3.89 100 80 60 40 20 0 02468 Heating Capacity [kW] 9.0 MPa SH: 35/30oC DHW: 60oC B A C COP 3.70 Figure 5.5 The heat transfer process for the tripartite gas cooler in the combined mode illustrated in T-Q diagrams at 35/30oC (SH), 60oC (DHW) and varying high-side pressure. At 7.5 MPa high-side pressure, the minimal temperature difference between the CO2 and the water and the pinch point inside the gas cooler led to a very small heating capacity for the space heating gas cooler (B). Furthermore, the moderate discharge gas temperature from the com- pressor and the consequent low temperature difference in the DHW reheating gas cooler (C), limited the water flow rate in the hot water circuit. Owing to the latter and the high specific heat capacity of the CO2 in the near critical region, the CO2 was cooled down only a few degrees in the DHW preheating gas cooler (A). As a result, the temperature approach (∆TA)1 was almost 25 K, and the total heating capacity of the tripartite gas cooler was less than 5 kW. By increasing the high-side pressure to 8 MPa, the heating capacity of the space heating gas cooler (B) increased considerably as a result of the larger temperature difference between the CO2 and the water. The 6 K 1 The difference between the CO2 outlet temperature and the inlet air/water temperature in a counter-flow gas cooler is denoted the temperature approach. 118 Temperature [°C] Temperature [°C] Temperature [°C] 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
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