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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transfer. At some point this effect become miniscule, as the critical point is far enough away not to affect the pre-cooler behavior significantly. Therefore, the slope of the optimum pre-cooler volume fraction as a function of compressor inlet temperature changes, but since the optimum pre-cooler volume fraction continues to decrease another effect is in play. As the main compressor inlet temperature increases the temperature difference between the cooling water and CO2 increases, since the cooling water inlet temperature is kept constant. This causes the steady slow decrease of the optimum pre- cooler volume fraction above about 37oC. Another behavior that is revealed in Figure 6.21 is the increased importance of the low temperature recuperator to the cycle efficiency. The extra heat exchanger volume that is provided by the reduction of the pre-cooler volume is now available for the recuperators. The low temperature recuperator optimum volume fraction increase is very modest. Most of the volume is allocated to the high temperature recuperator in order to overcome the detrimental effect of the temperature difference reduction. 0.6 0.45 0.3 0.15 0 Pre-cooler HT Recuperator LT Recuperator 30 35 40 45 50 Compressor Inlet Temperature (oC) Figure 6.21 Optimum heat exchanger volume fractions for recompression cycle 133 Optimum HX Volume Fraction

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