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Paper ID: 134, Page 6 than that of the compressor with the VSD. It can be explained that compressor 1 with the inverters adjusted the frequency constantly, while compressor 2 always ran at a fixed frequency. Overall, the simulation can predict the power consumption for both FSD and VSD compressors with reasonable uncertainties. Fig. 8 Predicted and measured compressor power consumption Fig. 9 Predicted and measured temperatures The predicted discharge temperatures and the measured coil inlet temperatures have also been compared, as described in Fig. 9. It shows that the predicted results are always higher than the actual ones with an error of less than 10%; even the highest errors occur when the system is warming up in the first few minutes. Theoretically, the discharge temperature post-compression is supposed to be the same as the coil inlet temperature. However, in practice, the coils are installed a certain distance apart from the compressor, so it will have some energy losses during the sCO2 transportation process when the ambient condition is cold, even with the pipes around the heating coils have been relatively well- insulated (Bojić, Miletić & Bojić 2014). 4 SIMULATION RESULTS The numerical analysis for a transcritical CO2 heat pump with the auxiliary heater has been carried out. Several preliminary results with different discharge pressures are described in this section. Several known conditions have been given in Table 1. The maximum temperature and pressure of the compressor are 140 °C and 140 bar respectively. The targeted discharge temperature of CO2 is set as 180 °C when the ambient water (that is, approximately 20°C at the inlet) needs to be heated up higher than 100°C. Table 1 Known conditions for a transcritical CO2 heat pump with IHX and the auxiliary heater The results shown in Table 2 gives the heating performance with the increase of discharge pressure from 75 bar to 110 bar. When the superheat is 25K and the outlet temperature of IHX is 25°C, the inlet temperature of IHX depends on the CO2 properties at different discharge pressures. It can be seen that the highest discharge temperature at the pressure of 110 bar is 139.300 °C. Due to that, the maximum temperature of the compressor has been reached around 110 bar, hence, the heating performance with higher pressure is not necessarily to be studied. 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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