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Figure 6.27 and Figure 6.28 show the efficiency improvement for pressure increase (compared to 15 MPa) and temperature increase (compared to 550oC). These figures clearly indicate the effect of the main compressor outlet pressure and turbine inlet temperature on the cycle efficiency. While increasing the temperature improves the efficiency almost linearly, the beneficial effect of the main compressor outlet pressure increase saturates and is less than a percent for a pressure increase from 25 MPa to 30 MPa. This is not a surprising result since by increasing the turbine inlet temperature the underlying thermodynamic efficiency of the cycle is improved. Therefore, the cycle efficiency increase does not saturate with temperature. On the other hand, increasing the compressor outlet pressure helps by reducing the system fractional pressure drops and within a certain range (to ~ 25 MPa) improves the cycle Carnotization. That is why past 25 MPa the additional efficiency improvement is not significant, since only the reduction of the fractional pressure drops contributes to the efficiency improvement. The reason for the changing effect of pressure on the cycle efficiency can be explained by looking at the recompressed fraction, which is depicted in Figure 6.29. 0.5 0.4 0.3 0.2 0.1 0 550oC 650oC 750oC 850oC 15 17.5 20 22.5 25 27.5 30 Compressor Outlet Pressure (MPa) Figure 6.29 Recompressed fraction for recompression cycle 139 Recompressed FractionPDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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