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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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4.2 Re-heated and Inter-cooled Brayton Cycle This section investigates the use of several cycle layouts that use a combination of re-heat and inter-cooling. The cycles are investigated again in a direct version, which may be difficult to apply in the case of re-heat, as it requires a reactor operating at multiple pressure levels. In real life re-heat would be used only in an indirect cycle. This requires design of intermediate heat exchangers, which is difficult since the operating conditions and choice of reactor coolants can vary widely, which affects the final cycle performance. In addition it would be difficult to make a direct comparison with the cycle without re-heating. Therefore, the analysis helps understand the potential of re-heating for an indirect cycle only in a general way. In the case of inter-cooling the situation is much simpler since the design of an inter-cooler is the same as the design of the pre- cooler. Therefore, the analysis can show directly how inter-cooling affects the cycle efficiency. 2000 11000 1750 10500 1500 10000 1250 9500 1000 9000 750 8500 500 8000 250 7500 0 7000 0 10 20 30 40 50 60 70 80 90100110120 Total Heat Exchanger Volume (m3) Pumping Power Mass Flow Rate Figure 4.18 Pre-cooler pumping power and mass flow rate 91 Precooler Pumping Power (kW) Cooling Water Mass Flow Rate (kg/s)

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