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2643, Page 6 GC outlet temperature. It is also clear for the shown range that the COP is maximum at the lowest GC outlet temperature. Hence, for the best COP the cooling process in the GC should be the best possible. Figure 5b shows that COP increases with the increase of the evaporation temperature as in conventional (subcritical) heat pump cycles. This graph is generated for GC outlet temperature of 35 °C where the 86.2 bar GC pressure line represents the maximum COP line neglecting the effect that the changing evaporation temperature has on the optimum GC pressure. Considering the GC pressure curves for 75, 86.2, and 100 bar, it can be noted that the under-estimation of the optimum GC pressure generates higher reduction in COP compared to the over-estimation of the optimum GC pressure. For instance, at 10 °C evaporation temperature, the COP is 2.85 at 86.2 bar, while the COP at 75 and 100 bar is 0.82 and 2.65 respectively. The impact of the amount of the superheating taking place inside the evaporator, which adds to the cooling capacity at various GC pressures is plotted in Figure 6 for GC outlet temperatures of 35 °C and 45 °C, both at 15 °C evaporation temperature. At 35 °C, the superheating has negligible effect at all GC pressure except at 75 bar. At 45 °C, the superheating has a considerable effect on the COP for 75 and 100 bar GC pressures. It can be concluded that at most GC pressures, the superheating has hardly an influence on the COP, especially if the GC pressure is much greater than the critical pressure. However, if the GC pressure is close to the critical pressure, COP can significantly increase with an increasing amount of superheating, and even more so if additionally the GC outlet temperature is high. (a) (b) Figure 5: (a) The impact of varying the GC outlet temperature on the COP at different GC pressures and at 15 °C evaporation temperature (b) The effect of changing the evaporation temperature on the COP at different GC pressures and at 35 °C GC outlet temperature (a) Figure 6: (a) The influence of the superheating on the COP at 15 °C evaporation temperature; and (a) 35 °C GC outlet temperature and (b) 45 °C GC outlet temperature 17th International Refrigeration and Air Conditioning Conference at Purdue, July 9-12, 2018 (b)PDF Image | Transcritical CO2 Heat Pump Cycle
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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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