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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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increase is steeper. Figure 6.7 also shows the CO2 mass flow rate required for the 600 MWth plant design. 6.3 Study of Required Heat Exchanger Volume Probably the most important question is how large the recuperators and pre-cooler should be to achieve the highest efficiency at the lowest cost. Another question is how the total heat exchanger volume should be allocated among the cycle heat exchangers. This section gives an answer to these pressing questions and establishes the total heat exchanger volume that will be used for further studies. 48 46 44 42 40 38 36 34 Thermal Efficiency Thermal Efficiency Less the Pre-cooler Pumping Power Simple Brayton - Thermal Efficiency Less the Pre-cooler Pumping Powe 0 50 100 150 200 Total Heat Exchanger Volume (m3) r Figure 6.8 Recompression cycle efficiency as a function of heat exchanger volume The system optimization of the recompression cycle was performed in a similar manner as for the normal Brayton cycle. The analysis is more complex in this case since there are three heat exchangers that have to be optimized. The split of the total heat exchanger volume among the high temperature recuperator, low temperature recuperator and the pre-cooler presents two parameters that have to optimized. In addition the 120 Efficiency (%)

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