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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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5.6 Comparison of Advanced Supercritical Cycle Layouts Angelino carried out a comparison of all these cycle layouts and concluded that at turbine inlet pressures around 20 MPa the recompression cycle achieves the highest efficiency among the studied cycle layouts. At lower pressures the more complicated partial cooling cycle with improved regeneration performs the best. The reason for this behavior is that the turbine exhaust pressure can be selected independently of the main compressor (or pump) inlet pressure, which improves the cycle potential at lower pressures. Probably the best way to display the effect of each component on cycle efficiency is to track the effect of each component on the deviation of the cycle from the Carnot cycle. Figure 5.5 shows this comparison as obtained by Angelino [Angelino, 1969]. This figure clearly shows the virtual independence of the partial cooling cycle with improved regeneration on the turbine inlet pressure. This is a significant advantage for cycle operation at part load if pressure control is used. The cycle efficiency would be unaffected by the operating pressure reduction due to part load operation and the cycle would behave in the same way as the helium Brayton cycle with pressure control. Perfect Gas Condensation Recompression Partial Cycle Cycle Cycle Condensation Cycle Partial Condensation Cycle with Improved Regeneration Figure 5.5 Comparison of cycle losses [from Angelino, 1969] 111

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