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5 – Experimental Results 100 80 60 40 20 0 02468 Heating Capacity [kW] 9.5 MPa DHW: 70oC A pinch C COP 3.33 100 80 60 40 20 0 02468 Heating Capacity [kW] 9.0 MPa DHW: 70oC ∆TA A pinch C COP 3.09 100 80 60 40 20 0 02468 Heating Capacity [kW] 10.0 MPa – Optimum pressure DHW: 70oC A C COP 3.58 100 80 60 40 20 0 02468 Heating Capacity [kW] 10.5 MPa DHW: 70oC A C COP 3.41 Figure 5.27 The heat transfer process for the gas cooler in the DHW mode illustrated in T-Q diagrams at 70oC DHW tempera- ture and varying high-side pressure. COP vs. the Hot Water Temperature Figure 5.28 presents the measured COP for the CO2 heat pump unit at varying hot water temperature. The evaporation temperature was -5oC (3.046 MPa), the suction gas superheating was 1.8 K ±0.6 K, the CO2 mass flow rate was 1.40 kg/min ±1.5% and the city water temperature was 5.7oC ±0.7oC. The maximum COP at the optimum high-side pressure dropped off by approximately 6% when the set-point for the hot water temperature was changed from 60 to 70oC. This was a result of the 13% reduction in the water flow rate and the roughly 1 MPa higher optimum high-side pressure at 70oC. The heat transfer processes at optimum high-side pressures are displayed by means of T-Q diagrams in Figure 5.29. 135 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
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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