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Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors

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Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors ( supercritical-carbon-dioxide-cycle-next-generation-nuclear-r )

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about 88% for 80 m3 of total heat exchanger volume and increases to about 91% at 200m3 of total heat exchanger volume. The effectiveness of the high temperature recuperator starts at about 94% and increases to slightly more than 98%. 1 0.975 0.95 0.925 0.9 0.875 0.85 80 110 140 0.44 0.42 0.4 0.38 0.36 0.34 0.32 0.3 170 200 HT Recuperator LT Recuperator Recompressed Fraction Total Heat Exchanger Volume (m3) Figure 6.12 Recuperator performance of the recompression cycle Other important cycle parameters are the fractional pressure drops of the components. Their values are depicted in Figure 6.13. Unlike in the case of the normal Brayton cycle the fractional pressure drop of the pre-cooler is very low, about the same order as the high pressure sides of the recuperators. This is due to the lower mass flow rate in the pre-cooler, which is caused by the flow split and recompression before the pre- cooler and by the high density of CO2 around the critical point. The most important pressure drops are those for the low pressure sides of the recuperators. The low temperature recuperator low pressure side pressure drop dominates the pressure drops. The pressure drops of the high pressure sides of the recuperators are very small, on the order of the pre-cooler pressure drop. The low temperature recuperator pressure drop is slightly higher than the high temperature recuperator pressure drop. 125 Recuperator Effectiveness Recompressed Fraction

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