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PRECOOLER COMPRESSORS FLOW MERGE FLOW SPLIT TURBINE GENERATOR LOW TEMPERATURE RECUPERATOR HIGH TEMPERATURE RECUPERATOR Figure 13.4 Supercritical CO2recompression cycle layout If one assumes the plant capital cost (in $/kWe) for a certain total heat exchanger volume the total capital cost can be calculated because the reactor thermal power and the cycle efficiency are known. By using this plant as a reference one may quantify the additional cost arising from the additional heat exchanger volume. This yields a new total capital cost. This new plant will have a higher efficiency and therefore the electric power production will be higher as well. The cost of the new plant on a $/kWe basis can then be calculated from the new electric power and the new total capital cost. By dividing by the original plant cost it is possible to obtain the ratio of the cost of the new plant compared to the original plant. Because the cost increase is linear with the total heat exchanger volume, but the efficiency increase becomes smaller and smaller with the increase of the total heat exchanger volume, at some point the plant capital cost in $/kWe will reach its minimum, i.e. the optimum total heat exchanger volume. Figure 13.5 shows the result of this analysis for different values of the capital cost per kWe of the original plant. The cost was normalized to the cost at which the plant capital cost was the lowest (140 m3 for 1000 $/kWe, 160 m3 for 1500 $/kWe and 200 m3 for 2000 $/kWe). These curves were developed assuming that the pre-cooler is made of titanium with a cost of 304 K$/m3 and the recuperators are made of stainless steel with a cost of 132 K$/m3 [Dewson and Grady, 2003]. As expected the optimum value of the total heat exchanger volume is a function of the plant capital cost. This is caused by the 274 REACTORPDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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