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Supercritical Carbon Dioxide Cycle Analysis

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Supercritical Carbon Dioxide Cycle Analysis ( supercritical-carbon-dioxide-cycle-analysis )

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4.7 Chapter Summary The development of Fortran codes for heat exchanger modeling has been a major task in examining the possible range of efficiencies for SFRs. These codes have been expanded to include new capabilities needed for modeling different SFR design configurations. Coupled with CYCLES III and STEAM PRO 16, the heat exchanger codes can be used to determine the achievable efficiency of an SFR. Printed Circuit Heat Exchanger (PCHE) codes have been expanded to include sodium-to-sodium and sodium-to-water heat exchangers. They are compact and highly effective. The SoSaT code was written from scratch to model shell-and-tube heat exchangers. It performs calculations for sodium-to-sodium, sodium-to-CO2, and sodium-to- water heat exchangers. Water can be either boiling or supercritical. Tubes can be single or double-walled and can include enhanced heat transfer surfaces for CO2. Baffles can be included on the shell side. Eliminating the intermediate loop is only a practical option for loop-type SFR designs. This idea is elaborated in Chapter 5. Using an alternate fluid in the intermediate loop was shown by Cooper and Lee to have no advantage for any of the fluids studied. Most efficiency gains therefore, will come from measures to raise the average core outlet temperature or changes in the balance of plant. The tools developed here are used in Chapter 5 to quantify the achievable efficiency of an SFR and to compare the performance of heat exchangers and power cycles from an efficiency perspective. In Chapter 5, the range of options for SFR design will be discussed and results from the heat exchanger codes will be used to show the achievable efficiencies of SFRs. 103

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