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4 Temperature Profiles in CO2 Power System Heat Exchangers 4.1 Cp Variation and Its Influence on the CO2 Power Cycle Temperature Profiles in the Heat Exchangers As mentioned in previous chapters, carbon dioxide has a low critical temperature (31.1 °C), which allows the carbon dioxide power cycle to work either as a transcritical power cycle or a Brayton cycle depending upon the heat sink temperature. This means that at least part of the cycle will be located in the supercritical region. The thermophysical properties of supercritical CO2 will have sharp variations in the region close to its critical point, which is also the region where the heat receiving process of supercritical CO2 takes place for a transcritical carbon dioxide power cycle. Therefore, the thermophysical properties of supercritical CO2 need to be carefully examined, when analyzing the CO2 transcritical power cycles, due to their significant influence on the performance of both the gas heater and the Internal Heat Exchanger (IHX) in the heat transfer processes. The specific heat (Cp), which is the main factor that influences the supercritical CO2 temperature profile in the heat exchangers, is plotted as a function of temperature at different pressures in the following figure (Figure 4‐8). 51PDF Image | Thermodynamic Cycles using Carbon Dioxide
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