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41 40.5 40 39.5 39 38.5 38 37.5 37 36.5 36 35.5 Tmin, oC 0.4 0.5 0.6 0.7 0.8 0.9 CO2 FLOW SPLIT FRACTION 32 31.5 31.25 31 30 25 20 15 Figure 8. Effect of the Cycle Efficiency versus Minimum Temperature (pmin=7.4 MPa). 4.2.2. Minimum Pressure with Supercritical Temperature – Transition through a Pseudocritical Point in the Cooler Figure 8 showed that greater cycle efficiency could be achieved if CO2 is cooled below the pseudocritical temperature at the selected supercritical pressure. For pressures above the critical value, the pseudocritical temperature lies above the critical temperature. Similar results could be achieved by a variation of the minimum pressure at a fixed temperature. Figure 9 demonstrates that the pseudocritical temperature (temperature at which a peak in specific heat occurs for a given pressure) increases with pressure. Figure 9 also demonstrates that the density increases with pressure for a fixed temperature. For example, the density jumps sharply at 31.3 oC from 7.40 MPa to 7.45 MPa. This is due to the fact that the pseudocritical temperature is below 31.3 oC for 7.40 MPa and above that for 7.45 MPa. If, for a fixed temperature, the pressure is selected such that the compression occurs close to the pseudocritical conditions, the high CO2 density would provide lower compressional work and, therefore, higher cycle efficiency. Similar to the previous cases, this benefit would come at the price of a larger cooler requirement since CO2 would need to be cooled below the peak in the specific heat (i.e., a greater energy removal in the cooler). Figure 10 shows the possibility to improve the cycle efficiency at the expense of the cooler volume by means of the minimum pressure variation at the reference minimum 22 CYCLE EFFICIENCY, %PDF Image | Performance Improvement Options for the Supercritical Carbon Dioxide Brayton Cycle
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