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NOVEL TRANSCRITICAL CO2 HIGH- TEMPERATURE HEAT PUMP

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NOVEL TRANSCRITICAL CO2 HIGH- TEMPERATURE HEAT PUMP ( novel-transcritical-co2-high--temperature-heat-pump )

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Paper ID: 134, Page 3 the compressor. More importantly, the heating efficiency at such a low discharge pressure (which is near the critical point) is relatively high. Fig. 1 The high-pressurized cycle of a CO2 system Fig. 2 The CO2 cycle with an auxiliary heater Fig. 3 The CO2 cycle with an IHX Fig. 4 The CO2 cycle with both IHX and auxiliary heater 2.2 Physical Model Due to the compressor constraints, the operating cycle with IHX and the auxiliary heater has been selected for boosting the discharge temperature, as shown in Fig. 4. In industry, due to a pressure regulator normally utilized with the compressor, the auxiliary heating process will be operated in an isobaric way. In terms of the amount of energy required, there is no difference in auxiliary heating of CO2 or water in the system, of which working theories are described in Fig. 5 and Fig. 6 respectively. If the auxiliary heater is purposed for CO2, the reheating process will occur followed by the compression in an isobaric process, in order to achieve a wider temperature range and larger heat capacity for delivery. Based on the existing counter-flow plate heat exchanger, the pinch temperature difference between water/steam and CO2 can be minimized to 3K. However, if the process is for boosting water/ steam temperature directly, the auxiliary heating configuration will be set up after the heat exchanger process of the water loop. Fig. 5 The schematic of auxiliary CO2 heating Fig. 6 The schematic of auxiliary water heating 6th International Seminar on ORC Power Systems, October 11 - 13, 2021, Munich, Germany

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