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: wc =wcm(1−rfrac)+wcrrfrac (3-68) qout = (1− rfrac )(hpin − hpout ) (3-69) where w stands for work and q for heat. Suffix c denotes the sum of compressors’ work and subscript cr stands for recompressing compressor. Subscript p denotes the pre-cooler and subscripts in and out stand for inlet and outlet conditions respectively. The efficiency is calculated based on two formulas in order to confirm the convergence of the subroutine RECOMP. The subroutine writes the main results to a file and if required it writes the cycle state points as well. 3.6 Program CYCLES Program CYCLES is the governing program for the parametric studies. It reads the input and calls the other subroutines with the appropriate variables. The main program also manages the output files and property tables if required. Currently the property tables are available only for the heat exchanger calculations. All other subroutines use the NIST 12 pure fluid property subroutines. If required the property read in can be suppressed by setting ITAB to 1, in which case the code can use only the NIST 12 pure fluid property subroutines. This setting is helpful if one does not intend to go through the design of the heat exchangers or require that they be designed using the NIST 12 property routines. It should be noted that designing the heat exchangers using the NIST 12 subroutines is more precise, but requires a significant amount of time. The code CYCLES can be used for many different analyses of different Brayton cycles. The rest of this section describes the most important case - the steady state optimization of the power cycle. It is demonstrated on the example of a simple Brayton cycle. For the cycle design the optimization of the cycle heat exchangers is a very important step. In the case of the standard Brayton cycle without inter-cooling or re- heating in a configuration of a direct closed cycle there are two heat exchangers: the pre- 69

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