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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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EXPAND track the values of the inter-coolers’ or re-heaters’ hydraulic and thermal performance and make them available for the cycle efficiency calculations. The evaluation of the compression or expansion process starts from the machine inlet conditions that were specified in the input. If only one compressor or turbine is used the subroutine calculates the outlet conditions based on the total pressure ratio, machine efficiency and the inlet fluid conditions. The calculation procedure is the following: (3-1) (3-2) (3-3) (3-4) (3-5) (3-6) pcout =pcinrac ptout = ptin rat scoutid = scin (pcin ,Tcin ) stoutid =stin (ptin ,Ttin ) wc = hcoutid (pcout ,scoutid )− hcin (pcin ,Tcin ) ηc wt =ηt[htoutid(ptout,stoutid)−htin(ptin,Ttin)] where p stands for pressure, s for entropy, w for work (kJ/kg), h for enthalpy T for temperature, ra for pressure ratio and η for total to total efficiency. Suffix c denotes a compressor and suffix t denotes a turbine. Suffixes in and out denote the inlet or outlet conditions respectively. The suffix id denotes the ideal state, i.e. if the turbine or compressor were ideal components and the compression or expansion process was isentropic. Given the turbine and compressor work the rest of the state points can be determined. In the case of inter-cooling or re-heating the situation is more complicated. For each turbine or compressor the same calculation procedure as described above can be used if we know the inlet conditions and the pressure ratio. The inlet conditions are known for the first compressor or turbine; for every other they have to be evaluated based on the pressure ratio split and inter-cooler or re-heater pressure drop. 42

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