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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also contains the numerical model variables, such as convergence tolerance. The subroutine calculates the heat exchanger outlet conditions. The code first guesses the cold side enthalpy at the hot end and calculates the thermal and hydraulic performance through the heat exchanger as described in Section 3.3.3. The calculated cold side enthalpy at the cold end is compared to the input value. If the difference is within the user-specified tolerance the subroutine returns the calculated values. Otherwise, the guess of the cold side enthalpy at the hot end is adjusted and the heat exchanger performance is evaluated again. 3.3.5 Subroutine PCHElen In this subroutine the length and the pressure drops of the PCHE are estimated based on the heat exchanger face dimensions and operating conditions. The operating conditions are all known with the exception of pressures on the hot and cold side outlets. The subroutine first calculates the total heat exchanger power based on the input enthalpies and mass flow rate and using the methodology described in Section 3.3.3 the heat exchanger length and pressure drop are calculated. The geometry is read from the input file, the name of which is specified in the input variable hxtype (hxtype is defined in the corresponding cycle subroutine). 3.3.6 Subroutine PRECOOLER The subroutine PRECOOLER is organized in a slightly different manner than that of PCHEvol. The user specifies the total volume of the pre-cooler and the operating conditions: • Hot side (CO2): mass flow rate, inlet and outlet temperatures. • Cold side (cooling water): inlet temperature. Therefore the subroutine iterates on the cooling water mass flow rate and the cooling water outlet temperature. 59

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