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uncertainty. Since the turbomachinery consists of a generator, turbine and two compressors (four bodies), one may in the first approximation assume that the cost of single turbomachinery body is about one fourth of 46,000K$. In such a case, the additional turbomachinery cost will be 11,500K$ for one stage of re-heat and 23,000K$ for two stages of re-heat. Therefore neither one nor two stages of re-heat constitute savings large enough to overcome this additional capital investment. 1.15 1.1 1.05 1 0.95 580 620 660 700 740 780 2 Re-heats 1 Re-heat No Re-heat Reactor Outlet Temperature (oC) Figure 7.12 Relative costs of different indirect cycle options Hence one cannot draw any conclusion other than that the potential of re-heat is very limited and use of more than one stage of re-heat is not economically attractive. A final answer would require a very detailed economic analysis. Figure 7.13 shows the indirect cycle efficiencies. The efficiency improvement between the simple and single re-heat recompression cycle is about 1.5%, and yet as was shown in the preceding paragraph, this does not constitute a really significant advantage for single re-heat cycles. This is caused partly because of the higher cost of the required heat exchangers (Figure 7.14) and partly because of the additional non-quantified 171 Relative $/kWe Capital CostPDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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