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From Figure 6.29 it is apparent that the recompressed fraction is affected by the compressor outlet pressure significantly more than by the operating temperature. At low main compressor outlet pressure the recompressed fraction is very small (about 10% of the total mass flow) and therefore a large portion of the flow is sent to the pre-cooler, which causes higher heat extraction from the cycle and therefore reduces the cycle efficiency. The recompressed fraction reaches its maximum value somewhere near 21 MPa (depending on the turbine inlet temperature). Therefore, at this pressure the cycle operates thermodynamically at its optimum. The further increase of the main compressor outlet pressure reduces the recompressed fraction, but since its decrease is not very steep the beneficial effect of fractional pressure drop reduction has a larger effect and thus the cycle efficiency keeps on increasing. 0.6 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 6.30 High temperature recuperator optimum volume fraction for recompression cycle The behavior of the recompressed fraction affects the design of the cycle heat exchangers as well. The following three figures (Figure 6.30, Figure 6.31 and Figure 6.32) show the value of the optimum heat exchanger volume fraction for the high and low 140 HT Recuperator Optimum Volume Fraction (-PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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