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efficiency will be improved by increasing the expansion inlet temperature. However, after a sharp increase at the beginning, the efficiency slope becomes flat if one further increases the expansion inlet temperature to the high temperature region11. These figures also illustrate that the efficiencies of expansion units will have more crucial impact on the cycle efficiency than the efficiencies of compression units. 0.12 0.11 0.1 0.09 0.08 0.07 0.06 0.05 0.04 0.03 0.02 100 150 200 250 300 T expan. inlet [°C] 80% pump eff. 90% expan. eff. 80% pump eff. 80% expan. eff. 80% pump eff. 70% expan. eff. 80% pump eff. 60% expan. eff. 60 bar condensing pressure 120 bar gas heater pressure Figure 3‐1 Carbon dioxide transcritical cycle efficiency vs. expansion inlet temperature against various expansion efficiencies (from EES, basic cycle without IHX) 11 This result is based on the given gas heater pressure, which is in the lower pressure region compared with the carbon dioxide Brayton cycle. In the current research in utilizing the low‐grade heat source by transcritical power cycle, only relatively lower gas pressure is considered, for the consideration of system safety, etc. 23 eff.PDF Image | Thermodynamic Cycles using Carbon Dioxide
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