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40.5 40 39.5 39 38.5 38 37.5 37 36.5 36 Cycle System Tcrit 29 30 31 32 33 34 35 COMPRESSOR INLET TEMPERATURE, oC 300 250 200 150 100 50 29 30 31 32 33 34 35 COMPRESSOR INLET TEMPERATURE, oC Tcrit Figure 7. CO2 Cycle Efficiency versus Minimum Temperature and Cooler Volume Tradeoff. [8] 4.2.1. Minimum Temperature with Supercritical Pressure – Supercritical Cycle versus Liquid at Supercritical Pressure Cycle Figure 8 shows in greater detail how the cycle efficiency varies with the minimum temperature during the transition from supercritical to the liquid phase at supercritical pressure. As in Figure 7, the peak cycle efficiency is achieved at 30 oC. Cycle efficiency for the cases where the liquid CO2 enters the main compressor (strictly speaking, a pump) in a liquid phase at temperatures slightly lower than the critical temperature (20-31 oC) is close to the peak efficiency. Both these facts are due to the high CO2 density in the liquid phase at the compressor/pump inlet. The results in Figure 7, as well as other results in this chapter, are obtained under the assumption that a cold heat sink is available to cool the CO2 below 30 oC, if needed. The heat sink (water) temperature for the reference conditions is assumed to be at 30 oC, as shown in Figure 2. 21 EFFICIENCY, % COOLER METAL MASS, tonnesPDF Image | Performance Improvement Options for the Supercritical Carbon Dioxide Brayton Cycle
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