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Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors

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Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors ( supercritical-carbon-dioxide-cycle-next-generation-nuclear-r )

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was 11.4 MPa and a turbine pressure ratio of 2 was used. The major components such as pump, turbine and recuperator were designed. The pump efficiency achieved 75%, for the turbine driving the pump the maximum efficiency was over 88%. For the power turbine a more compact (2 stages) rather than a highly efficient (4 stages) design was selected, yielding an efficiency of 85%. The tube inner diameter for the recuperator was 2.3mm. The pre-cooler was a CO2 to air atmospheric heat exchanger. Start-up and control methods were postulated as well. Part load operation was achieved by use of a parasitic load bank. The turbine bypass control method was rejected because of the high requirements on the bypass valve. Figure 2.15 depicts the 150 kWe power cycle module, showing the basic dimensions. Figure 2.15 Schematic of the Hoffman – Feher 150 kWe S-CO2 power cycle module [from Hoffman and Feher, 1970] 2.3.4 Case Study Designs During the late 1960s and early 1970s the investigation shifted from thermodynamic studies to more detailed design studies. These studies used two different cycle layouts: 27

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