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5.4 Summary In this chapter, second law analyses have been performed for the carbon dioxide transcritical power system to show the possible system losses and the potential for improvement. The exergy destruction and the entropy generation are calculated by varying one system operating factor at a time, while keeping other assumed system operating conditions constant. Generally, the results show that the matching of the temperature profiles in the system heat exchangers will have crucial influence on the performance of the heat exchangers. The pressure ratio will be one of the main factors influencing the performance of the pump and the expander. By plotting the distribution of entropy generations against different system operating parameters, it can be noted that the main system losses are from the system heat exchangers under the assumed system working conditions. With an increasing CO2 mass flow rate, the exergy destruction and entropy generation 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, due to the changes of the temperature profile matching in the heat exchangers. Meanwhile, the 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. If other system operating parameters are kept constant, but the system high pressure side pressure is increased, the exergy destruction and entropy generation will increase in the pump and the expander. Furthermore, due to the better matching of the temperature profiles in the system heat exchangers at higher system high pressure side pressures, their exergy destruction and entropy generation decrease. For the whole 74PDF Image | Thermodynamic Cycles using Carbon Dioxide
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