Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors

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Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors ( advanced-nuclear-power-technology-program-supercritical-carb )

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the reactor. Next, the fluid expands in a turbine and passes to the recuperator where its heat is regenerated. The difference from the normal Brayton cycle is that when the temperature difference in the recuperator becomes low a compressor is introduced that compresses the fluid to higher pressure. The temperature of the fluid rises as a result of the compression process and in addition its specific heat increases as it is compressed to the higher pressure. Thus, the regeneration process can continue and more heat is available for the regeneration than in the case of the normal Brayton cycle. This extra heat reduces the average temperature at which heat is rejected from the cycle and increases the average temperature at which heat is added to the cycle. This ultimately leads to an efficiency improvement over a Brayton cycle that would otherwise suffer from the pinch-point problem. Figure 5.1 Schematic of the pre-compression Brayton cycle [from Angelino, 1968] As reported in [Angelino, 1968] this cycle layout can achieve an up to 6% efficiency improvement over the normal Brayton cycle, if carefully optimized. 106

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