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cycle, cases using the helium Brayton cycle were made as a baseline. Then more complicated CO2 cycle will be investigated in the FY-05 first quarter, and will be reported next quarter. To determine the effects of interstage cooling [Oh and Barner, 2006] on cycle efficiency 1, 2 and 3 intercoolers were added to the basic indirect recuperated Helium cycle. The pressure drop through the precooler was set at 20 kPa. With a 1-intercooler layout the intercooler pressure drop was set to 50 kPa. With 2 intercoolers the first intercooler pressure drop was set to 37 kPa and the second intercooler set to a pressure drop of 50 kPa. With a 3-intercooler layout the first, second and third intercooler pressure drops were set to 30, 40 and 50 kPa, respectively. These pressure drops were chosen because they are representative of pressure drops used in the MIT studied on an indirect Helium Brayton cycle with a maximum system pressure of 8 MPa [Wang, 2003]. A base design for each cycle was determined and input into HYSYS. HYSYS was then used to simulate and optimize each cycle. The base cycle used in this study was the indirect Helium cycle and the operating conditions used are summarized in Table 3-6. The efficiency without intercooling was 45.19%. The efficiency with 1,2 and 3 intercoolers was 48.25%, 48.92% and 49.07%, respectively. Table 3-6. Cycle conditions used for intercoolers Condition Value Reactor Power 600 MW Reactor Outlet Temp 900 C Turbine Polytropic Efficiency 92% Compressor Polytropic Efficiency 90% IHX Effectiveness 90% Recuperator Effectiveness 95% IHX Primary Side Pressure Drop 150 kPa IHX Secondary Side Pressure Drop 175 kPa Recuperator Hot Side Pressure Drop 90 kPa Recuperator Cold Side Pressure Drop 50 kPa Precooler Pressure Drop 20 kPa Intercooler Pressure Drop 30 kPa Compressor Inlet Temp 28 C Pressure Ratio 2.1 Effect of reheat The objective of this task is to determine how much a reheat option can enhance the cycle efficiency and to find out technical issues associated with the reheat option. For these calculations, a cycle similar to the proposed Advanced High Temperature (AHTR) [Forsberg et al., 2004, Peterson, 2003] was used with Flibe, a fluoride molten salt, as a coolant fluid in the primary side and helium in the Brayton cycle. Theoretically a combination of reheat and intercooling increases the cycle efficiency in a closed cycle, the implications have not been explored. Multiple-reheat is technically viable for closed gas cycles, as demonstrated by the PBMR turbomachinery design with three separate turbines. For gas-cooled reactors, a multiple reheat option may not be practical due to higher-pressure loss associated with gases, 34PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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