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Therefore, reheater pressure drop does not constitute a significant loss of the useful turbine work. In the case of supercritical CO2 turbines this pressure difference is smaller and thus the re-heater pressure drop is more important. This is especially true in the case of the helium Brayton cycle, where the pressure difference across the turbine is even smaller. Figure 7.19 shows the minimum effect of the primary system pumping power on the cycle efficiency, which explains the good performance compared to the direct cycle. The cost of the heat exchangers is much less than that for the helium indirect cycle, where the heat exchanger cost was at best around 3 million dollars. The optimum reactor inlet temperatures are higher than those of the helium Brayton cycle, which indicates that higher temperature difference is more beneficial than the increase of pumping power, which is opposite to the helium system finding. This also helps to explain why the cost of the heat exchanger is so low. 2 Re-heats 1 Re-heat No Re-heat 750 700 650 600 550 500 450 400 580 620 660 700 740 780 Reactor Outlet Temperature (oC) 179 Reactor Inlet Temperature (oC)PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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