Thermodynamic Cycles using Carbon Dioxide

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Thermodynamic Cycles using Carbon Dioxide ( thermodynamic-cycles-using-carbon-dioxide )

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It can be seen from the figures that the exergy destructions and entropy generations are almost constant in the pump and the expander. At the same time, they increase in the gas heater, but decrease in the gas cooler & condenser with an increasing CO2 mass flow rate. Meanwhile, it can also be seen from the figures that the changes in exergy and entropy in the heat exchangers have close relations with the temperature matching as well. With an increasing mean temperature difference in the gas heater and a decreasing pinch temperature in the gas cooler & condenser, the exergy destruction and entropy generation increase in the gas heater, while decreasing in the gas cooler & condenser respectively. Figure 5‐4 shows the change in the distribution of entropy generations in the system with increasing CO2 mass flow rate. It can be seen from the figure that distribution of entropy generation increases in the gas heater, while decreasing in the gas cooler & condenser and almost constant in the pump and the expander. Figure 5‐4 Distribution of entropy generation vs. CO2 mass flow rate Figure 5‐5 and Figure 5‐6 show the exergy destruction and entropy generation in different system components against an 68

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