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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where suffix rc denotes the cold side of the recuperator and the suffix r denotes the reactor or intermediate heat exchanger. The turbine outlet pressure can be similarly calculated as: ⎛ ∆p ∆pp ⎞ ptout = pcin ⎜1− rh − ⎟ (3-56) ⎝ pmaxrh pmaxp ⎠ where the suffix rh stands for the hot side of the recuperator and the suffix p stands for pre-cooler. If the pressure drops are not defined they are zero at the first guess and the code iterates until the pressure drop difference is within the specified precision. Given the turbine inlet and outlet pressure the turbine pressure ratio is known and the subroutine EXPAND can be called. The recuperator inlet conditions are now known from the results of the COMPRESS and EXPAND subroutines and therefore the recuperator state points can be evaluated. The subroutine RECUP calculates the outlet conditions of the recuperator either based on the specified recuperator effectiveness or based on the provided recuperator geometry. If the pressure drops were not specified the subroutine RECUP uses the results of the PCHEvol or PCHElen routines as the new values of the recuperator pressure drops. After establishing the recuperator outlet conditions the pre-cooler and the reactor or intermediate heat exchanger (based on whether the direct or an indirect cycle is used) are calculated. The subroutine PRECOOLER is used if it is desired to evaluate the pre- cooler pressure drop and the cooling water pumping power. At this point all the cycle state points have been evaluated. Therefore, the value of heat addition to the cycle and net specific work can be used to calculate the new mass flow rate or new power. Hence, next important specification for the cycle calculation is whether the working fluid mass flow rate is known or not. If the mass flow rate is specified (IPOWER 0) the program evaluates the cycle thermal power from: Q=m&qad (3-57) 63

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