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3. Multiple-Recompression Cycle The current reference S-CO2 cycle layout (Figure 2) – sometimes called a “recompression cycle” – was selected to compensate for the difference in the specific heats of the high and low pressure CO2 flows in the low temperature recuperator (LTR). The difference in specific heats over the LTR temperature range for 7.4 MPa and 20 MPa is so significant (Figure 3) that the benefits from splitting the CO2 flow to increase the LTR effectiveness overcome the drawbacks of the less efficient direct compression of a part of the uncooled CO2 flow. As a result, the recompression Brayton cycle configuration provides a higher efficiency than the simple Brayton cycle configuration provided that an optimal flow split fraction is selected. For the high temperature recuperator (HTR) temperature range, the difference in CO2 specific heats is not so significant, as shown in Figure 3. For that reason, splitting the CO2 flow to improve the effectiveness of HTR would not improve the cycle efficiency as much as it does for the LTR. Thus, only one flow split for the LTR is implemented in the reference cycle. 3 2.5 2 1.5 1 0.5 0 LTR HTR 7.4 MPa 20 MPa 50 100 150 200 250 300 350 TEMPERATURE, oC Figure 3. CO2 Specific Heat Variation in Recuperators. Even though the differences in the specific heats is not so large in the HTR temperature range (compared to the LTR temperature range), there is still a potential to improve the HTR effectiveness by employing a second CO2 flow split involving the HTR. Similar to the recompression cycle, this flow split arrangement would result in the splitting the HTR 15 SPECIFIC HEAT Cp, kJ/kg-KPDF Image | Performance Improvement Options for the Supercritical Carbon Dioxide Brayton Cycle
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