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For the power part, the gas heater pressure is selected to 200 bar. The gas cooler pressure (85 bars) and the gas cooler outlet temperature (35 °C) are the same as for the cooling part. Furthermore, the compression and expansion efficiencies are assumed according to the cycle operating conditions listed above. Moreover, the combined cycle is designed mainly for automobile (i.e. truck) applications, and thus the expansion inlet temperature is assumed to be 350 °C, based on the fact that engine exhaust gas can have a temperature of 500°C at the exhaust gas manifold. 3.1.6 The influence of cycle working parameters on the CO2 cooling and power combined cycle performance The cooling part COP of the combined cycle is plotted against different gas cooler pressures, while keeping other cycle working conditions constant (Figure 3‐10). 5 4.5 4 3.5 3 2.5 2 1.5 1 70 80 90 100 110 120 Pgascooler (bar) Figure 3‐10 The COP of cooling part of the combined cycle vs. different gas cooler pressure From the figure, one can see that at the optimum gas cooler pressure, the improvement of the cooling cycle’s COP is 31 COP basic (without power part) COPnew (250bar gas heater pressure) COPnew (200 bar gas heater pressure) COPnew (140bar gas heater pressure) COPPDF Image | Thermodynamic Cycles using Carbon Dioxide
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