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3.1.5 Carbon dioxide cooling and power combined cycle The author is not aware of any similar cycle suggested in the literature. Therefore, there is no reference cycle operating condition available for carbon dioxide cooling and power combined cycle. For the cooling part of the combined cycle, the working conditions are selected according to the most commonly used working conditions in other research and in CO2 automobile A/C prototype testing (Kim et al., 2004). The evaporation pressure is set to 40 bar and the evaporation temperature will be 5.3 °C accordingly. As it is mentioned frequently in other research, there is an optimum gas cooler pressure for the carbon dioxide transcritical refrigeration cycle (Petterssen and Aarlien, 1998, Kauf 1999). For the heat rejection pressure, Liao and his colleagues (Liao et al.,2000) proposed a correlation to predict the optimum heat rejection pressure in terms of evaporation temperature and the gas cooler’s outlet temperature, which is expressed by Equation 3‐4 popt (2.778 0.0157 te )tc (0.381te 9.34) Equation 3‐4 The gas cooler pressure is then set to 85 bar, which is the optimum gas cooler pressure calculated by this equation, based on the assumed evaporation temperature and the 35°C gas cooler outlet temperature. Moreover, an IHX is included in the system to secure a 5 K superheat at the evaporator outlet as a fixed value to ensure there is no moisture at the compressor inlet. Furthermore, the compressor’s isentropic efficiency is assumed to be 75% according to the research done by Rozhentsev and Wang (Rozhentsev and Wang, 2001). 30PDF Image | Thermodynamic Cycles using Carbon Dioxide
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