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For the applications of the carbon dioxide power system, a carbon dioxide double loop system and a solar‐driven carbon dioxide power system are studied and discussed as examples. For the carbon dioxide double loop system, the simulation results indicate that the proposed double loop system can improve the cooling COP of a carbon dioxide cooling system by 34 % by utilizing the energy in low‐grade heat sources. For the solar‐driven carbon dioxide system, the system performance is simulated with Swedish climate data by dynamic simulation technique. The simulation results indicate that the solar‐driven carbon dioxide power system has the potential for heat and power combined productions. The daily simulation results for a typical Swedish summer day (15th of July) show that the system can achieve about 9% average thermal efficiency and 1.2 kW average power productions during the system working period. At the same time, the system can produce heat (hot water) with an average capacity of about 10 kW. The average temperature of the produced hot water is about 40 °C, which can be further increased by decreasing the water flow rate or by system modification. Annually, the system achieves both maximum power production and maximum thermal energy production in June. The maximum daily power production is about 12 kWh and maximum monthly power production is about 215 kWh. The maximum daily thermal energy production is about 112 kWh and the maximum monthly thermal energy production is about 2320 kWh. Furthermore, a simple economic analysis of the system shows the payback time for the simulated system is about 12 years, which can be further shortened if the system is under mass production or being used in the hot climate region, where much higher solar energy is available. The Cp variation of supercritical CO2 and its influence on the temperature profiles in the heat exchangers of CO2 power systems are also studied and compared with a typical Organic 78PDF Image | Thermodynamic Cycles using Carbon Dioxide
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