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3.1.3 Carbon dioxide Brayton cycle When the cycle works as a Brayton cycle, the heat rejection process will take place in the supercritical region and the condenser will, therefore, be called a gas cooler. The same efficiencies as those chosen for the pump and the expansion machine for carbon dioxide transcritical power cycles are adopted for the compressor and the expansion machine for carbon dioxide Brayton cycles as initial analysis conditions (i.e. 75% for the compressor and 75‐85% for the expansion machine). The gas heater pressure and gas cooler pressure are assumed to be 200 bar and 100 bar respectively for the initial cycle analysis and the influences of different gas cooler and gas heater pressures are also analyzed separately. 3.1.4 The influence of the cycle working parameters on the CO2 Brayton cycle performance Unlike the carbon dioxide transcritical power cycle, the carbon dioxide Brayton cycle lies completely in the supercritical region. For this reason, both the gas heater pressure and the gas cooler pressure will influence the cycle performance besides the influence by the effectiveness of the IHX, the heat source temperature and the compressor and expander’s specifications, etc. By plotting the expansion inlet temperature vs. cycle efficiency for a given pump efficiency with various expansion efficiencies, and by plotting the expansion inlet temperature vs. cycle efficiency for a given expansion efficiency with various pump efficiencies (Figure 3‐5 & Figure 3‐6), it is found that the cycle efficiency will be improved by increasing the expansion inlet temperature. Moreover, the improvements of the cycle thermal efficiency are less obvious in the higher temperature regions. In general, the Brayton cycle achieves lower thermal efficiency than the transcritical power cycle at the same expansion inlet temperature. Furthermore, it can be noticed that the efficiencies 26PDF Image | Thermodynamic Cycles using Carbon Dioxide
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