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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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with a high‐grade heat source (up to 800 °C) and high pressures in both the gas heater and gas cooler (CO2 Brayton cycle). Research on employing such a cycle for low‐grade heat source recovery has been relatively limited. In recent years, more and more interest has been shown in CO2 transcritical power cycles for utilizing the energy in low–grade heat sources. For instance, Zhang and his colleagues investigated the potential of CO2 power cycle in utilizing solar energy both theoretically and experimentally (Zhang et al., 2006 and 2007). The author and his colleagues investigated the performance of the carbon dioxide power cycle in utilizing low‐ grade heat sources and compared its performance with ORCs (Chen et al., 2005, 2006 and 2010). Moreover, Cayer and his colleagues studied CO2 power system under fixed system working conditions and discussed system optimizations (Cayer et al., 2009). Wang et al. tried to optimize the working parameters of supercritical CO2 power cycle under a fixed heat source condition by using a genetic algorithm and artificial neural network with an assumption that the system heat exchangers will provide sufficient heating /cooling to the desired cycle working conditions (Wang et al., 2010). Furthermore, Baik et al. compared the power based performance between CO2 and R124 transcritical power cycle (Baik et al.2011) 2.3 System Illustration and Corresponding Cycle Description There are two systems proposed in this study: the carbon dioxide bottoming system and the carbon dioxide cooling and power combined system. 2.3.1 The CO2 bottoming system and corresponding cycles The CO2 bottoming system consists of four main parts, namely: a gas heater, a turbine, a condenser (gas cooler), and a pump 12

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