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Figure 6.9 depicts the value of efficiency improvement of the recompression cycle over the normal Brayton cycle. The second curve is the efficiency improvement of the recompression cycle for an additional 10 m3 of total heat exchanger volume (i.e. efficiency at a certain heat exchanger total volume minus the efficiency at the 10 m3 smaller volume). One would like to know the optimum total heat exchanger volume that should be used for the cycle to give the maximum economic benefit, because as can be seen from Figure 6.9 the efficiency improvement becomes smaller and smaller as a larger total volume of heat exchangers is provided. Therefore at some point the efficiency improvement will be offset by the additional cost of the heat exchangers. In order to resolve this issue the following analysis was performed. 1.05 1.04 1.03 1.02 1.01 1 0.99 0.98 Original Plant 1000 $/kWe Original Plant 1500 $/kWe Original Plant 2000 $/kWe 80 100 120 140 160 180 200 Total Heat Exchanger Volume (m3) Figure 6.10 Optimum size of heat exchangers for recompression cycle If one assumes the plant capital cost (in $/kWe) for a certain total heat exchanger volume the total capital cost can be calculated because the reactor thermal power and the cycle efficiency are known. By using this plant as a reference one may quantify the additional cost arising from the additional heat exchanger volume. This yields a new total capital cost. This new plant will have a higher efficiency and therefore the electric 122 Actual Cost ($/kWe)/ Original Cost ($/kWePDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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