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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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6 Conclusion and Suggestions for Further Work 6.1 Conclusion In the current study, the potential of utilizing carbon dioxide power cycles in recovering energy in low‐grade heat sources and waste heat has been investigated. Two basic systems as carbon dioxide power system and carbon dioxide cooling and power combined system are proposed. The performance of the corresponding cycles as carbon dioxide transcritical power cycle, carbon dioxide Brayton cycle and carbon dioxide cooling and power combined cycle are studied. The influence of different cycle working parameters on the cycle performance is simulated by computer simulations. The simulation results show that there will be an optimum gas heater pressure for carbon dioxide power cycles at certain cycle working conditions. The optimum gas heater pressure will increase with increasing heat source temperature. Furthermore, the efficiency of the expansion machine will have more crucial influence on the cycle thermal efficiency than the pump efficiency does. For carbon dioxide Brayton cycles, there is also an optimum gas cooler pressure besides the optimum gas heater pressure for a certain cycle working condition. Moreover, the simulation results show that the carbon dioxide power cycle is highly regenerative, which makes the internal heat exchanger (regenerator) very important for the cycle if power production is sought. 77

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