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Thermodynamic Cycles using Carbon Dioxide

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

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system, the distribution of entropy generation decreases in the gas heater, while increasing in other components. The simulation results with increasing heat source temperatures show that the increasing heat source temperature will have a minor influence on the exergy destruction and the entropy generation in the pump and the expander. However, the exergy destruction and entropy generation in the gas heater as well as in the gas cooler & condenser will increase with the increasing heat source temperature. At the same time, the increment will be less obvious in the gas heater, but more obvious in the gas cooler & condenser due to the influence of their temperature profile matching. For the distribution of entropy generation in the system, it will increase in the gas cooler & condenser, while decreasing in the gas heater and remaining almost constant in the pump and the expander. Furthermore, by plotting the CO2 power system exergy efficiencies and the minimum temperature differences in the system heat exchangers against different system operating parameters, it is found out that the system exergy efficiency will decrease with an increasing CO2 mass flow rate, while it increases with an increasing system high pressure side pressure or an increasing heat source temperature. The simulation results also indicate that the matching of the temperature profiles in the system gas heater may have a crucial influence on the system exergy efficiency. 75

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