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Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors

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Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors ( advanced-nuclear-power-technology-program-supercritical-carb )

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shows the layout of the recompression cycle with one and two stages of re-heat that were used in the analysis. PRECOOLER COMPRESSORS FLOW MERGE LOW TEMPERATURE HIGH RECUPERATOR TEMPERATURE FLOW SPLIT TURBINES GENERATOR REACTOR GENERATOR REACTOR RECUPERATOR PRECOOLER COMPRESSORS FLOW MERGE LOW TEMPERATURE HIGH RECUPERATOR TEMPERATURE RECUPERATOR FLOW SPLIT TURBINES Figure 7.5 Recompression Cycle with one and two stages of re-heat The following figures display the results of this analysis. Figure 7.6 and Figure 7.7 show the costs in $/kWe relative to the reference direct cycle, Figure 7.8 and Figure 7.9 show the efficiency profiles and Figure 7.10 and Figure 7.11 show the cost of the intermediate heat exchangers and re-heaters. The details of intermediate and re-heater cost are described in Chapter 8. The trends on all figures are similar to those obtained for the simple recompression cycle. However, there are a few things that deserve mentioning. First of all, the split of the primary coolant flow among the multiple heat exchangers reduces significantly the pressure drop of the heat exchangers. In addition, in the case of re-heating, only the first heat exchanger has to withstand the design pressure (20 MPa in our case). Each successive re-heater deals with lower and lower pressures, which reduces the requirements on the amount of material and thus permits an increase of the flow area, which further reduces the re-heater pressure drops. 166

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