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Table 3-14. Summary of Primary working conditions for the combined cycle. Parameter Nominal Value Power, MW 600 Inlet temperature, °C 500 Inlet Pressure, MPa 7.05 Outlet temperature, °C 900 Outlet pressure, MPa 7 IHX pressure drop, MPa 0.05 Mass Flow, kg/s 289 Working fluid He The same Rankine bottoming cycle was used for all three working fluids. This cycle gets heat from the Brayton cycle through a steam generator located between the gas turbine and compressor. The steam turbine inlet temperature was set at 575°C to take advantage of the superheat option and keep the turbine outlet quality at 85%. Comparing the working fluids in this cycle it can be seen that the CO2 working fluid produces the highest efficiency and smallest component sizes. Helium and the N2-He mixture produced similar component sizes; however, helium had a slightly higher efficiency. Subtask 2-4-4 Efficiency optimization Using the conditions established in Table 3-14, the cycles were modeled and optimized in HYSYS. To calculate the efficiency the spreadsheet function of HYSYS was used. The overall efficiency of the VHTR was calculated as follows [Oh, et al., 2006]: overall WT WC WCIR 0.5*QH2 . (3-7) Qth Where WT is the total turbine workload, WC is the total compressor workload, WCIR is the circulator workload in the primary, secondary and, intermediate heat transport loops, Qth is the reactor thermal power, and QH2 is the power supplied to the hydrogen generating plant. The efficiency of the hydrogen generation plant was assumed to be 50%. A model to solve for the effectiveness of a heat exchanger is not defined in HYSYS and had to be developed. The effectiveness of a heat exchanger is defined as the ratio of the actual heat transfer rate to the maximum heat transfer rate. The spreadsheet function was used and the following equations were input: q qmax qmax Cmim(Th,i Tc,i) (2) (3) 46PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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