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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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efficiency than the carbon dioxide Brayton cycle with the same heat sink condition. When utilizing the energy in waste heat (e.g. engine exhaust gasses), a carbon dioxide Brayton cycle and carbon dioxide cooling and power combined cycle will be of interest. The simulation results of basic cycle performances show that the carbon dioxide transcritical power cycle has an optimum gas heater pressure for a certain cycle working condition. The efficiency of expansion units will have more crucial impact on the cycle efficiency than the efficiencies of compression units. Due to the character of the cycle, an Internal Heat Exchanger (regenerator) is very crucial to improving the cycle performance, if power is sought. For the carbon dioxide Brayton cycle and the power part of carbon dioxide cooling and power combined cycle, there is both an optimum gas heater pressure and an optimum gas cooler pressure for a certain cycle working condition. For the applications of carbon dioxide power systems: A carbon dioxide double loop system is proposed and its performance has been simulated. The results show that by utilizing the energy in a low‐grade heat source, the proposed carbon dioxide double loop system can improve the cooling COP of a carbon dioxide cooling system by 34 %. For the proposed carbon dioxide cooling and power combined systems, the COP of the basic carbon dioxide cooling system can be improved by 40% by utilizing the energy in the exhaust gas of truck engines. The performance of a solar driven carbon dioxide power system in the Swedish climate has been simulated in detail by dynamic simulations. 49

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