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simulation results with an increasing heat source temperature at the gas heater inlet show that the increasing heat source temperature will have minor influence on the exergy destruction and the entropy generation in the pump and the expander, but it will increase the exergy destruction and entropy generation in the system heat exchangers. With the increasing heat source temperature at the gas heater inlet, the distribution of entropy generation increases in the gas cooler & condenser, while decreasing in gas heater and remaining almost constant in the pump and the expander. The simulation results of system exergy efficiency against different system working parameters show 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 at the gas heater inlet. 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. In general, this study shows that the proposed systems and cycles will be a new way to make use of previously unexploited energy sources, which could otherwise be difficult with traditional power cycles. 6.2 Suggestions for Further Work In the last year of this study, more detailed studies of the system components such as the pump and the expanders have started. A CO2 test rig has been built in the lab to test the CO2 heat exchanger performance as well. Preliminary results have been obtained from both of these studies With regard to further work, the detailed computer models of different system components should be calibrated with the experimental data. Then the models of the calibrated 80PDF Image | Thermodynamic Cycles using Carbon Dioxide
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