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Paper ID: 134, Page 7 Table 2 The calculated results with the increase of pressure from 75 bar to 110 bar Then, the COP variation and discharge temperature with the increase of pressure is displayed in Fig. 10. The discharge temperature increases significantly with the pressure, while the COP without the auxiliary heater reduces with the pressure. However, if the CO2 heating process is combined with the auxiliary heater, the total heating COP increases slightly with the discharge pressure. Fig. 10 COP and discharge gas temperature Vs. pressure Fig. 11 Energy distribution with the increased pressure In terms of the energy distribution, as shown in Fig.11, the ratio of auxiliary heat capacity to CO2 heat capacity reduces with the increase of pressure, although the compressor input keeps increasing with the discharge pressure. Therefore, it is meaningful to operate an auxiliary heater at an optimal discharge pressure to achieve the maximum heating COP with a targeted discharge temperature of CO2. 5 CONCLUSION The following conclusions can be drawn from this preliminary study on a transcritical CO2 high- temperature heat pump: Four thermodynamic cycles have been identified and investigated with the consideration of industrial applicability. Based on the selected cycle, the physical model of the auxiliary heater has been developed. The mathematical model for Bitzer compressors with VSD and FSD has been validated against the existing experimental data, in which the simulated errors for both compressors are within ± 10%. The discharge temperatures have also been validated against the actual coil inlet temperatures with acceptable agreements. The mathematical model of the heating performance for a transcritical CO2 system with the auxiliary heater has been established. The simulation result shows that the total efficiency of the system does not have an obvious change in COPs (from 2 to 2.3) with various discharge temperatures by increasing the discharge pressure, which can be used to justify the auxiliary heater in a transcritical CO2 heat pump. 6th International Seminar on ORC Power Systems, October 11 - 13, 2021, Munich, GermanyPDF Image | NOVEL TRANSCRITICAL CO2 HIGH- TEMPERATURE HEAT PUMP
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