Thermodynamic Cycles using Carbon Dioxide

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

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performance have been discussed. Under Swedish climatic conditions, the maximum daily power production is about 12 kWh and the maximum monthly power production is about 215 kW h with the working conditions of the proposed system. Besides the power being produced, the system can also produce about 10 times as much thermal energy, which can be used for space heating, domestic hot water supply or driving absorption chillers. The simulation results show that the proposed system is a promising and environmentally benign alternative for conventional low‐grade heat source utilization system. Y. Chen, A. B. Workie, P. Lundqvist, “Second Law Analysis of a Carbon Dioxide Transcritical Power System in Low‐grade Heat Source Recovery”, submitted to Applied Thermal Engineering In this work, the performance of a CO2 power cycle in utilizing the low‐grade heat sources is simulated and the results are analyzed with a focus on second law thermodynamics (i.e. exergy and entropy). Different system parameters influencing the system exergy and entropy change are discussed. Engineering Equation Solver (EES) is used for simulation. The simulation results show that the matching of the temperature profiles in the system heat exchangers has crucial influence on their exergy destruction and entropy generation. It is also an essential factor that influences the system thermodynamic efficiencies. Y. Chen, P. Lundqvist, “Carbon Dioxide Cooling and Power Combined Cycle for Mobile Applications”, 7th IIR Gustav Lorentzen Conference on Natural Working Fluids, Trondheim, Norway, May 28‐31, 2006 A carbon dioxide cooling and power combined system, which can provide A/C and produce power at the same time, is proposed in this paper. The power part of the system can utilize 123

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