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3.5 Cycle Routines Using the above-described subroutines it is possible to construct any type of Brayton cycle. In this work the standard Brayton cycle and the recompression cycle are of main interest. Therefore, two cycle subroutines (SIMPCYC and RECOMP) were developed. Subroutine SIMPCYC analyzes the standard Brayton cycle either in the simple layout or with any combination of re-heat and inter-cooling. Subroutine RECOMP analyzes the recompression cycle. In both routines it is possible to select whether the cycle’s characteristics such as pressure drops, recuperator effectiveness and turbomachinery efficiencies are supplied or whether they are calculated by heat exchanger routines and the off-design turbomachinery performance maps. 3.5.1 Subroutine SIMPCYC This routine evaluates the performance of a standard Brayton cycle. It is possible to specify any number of inter-coolers or re-heaters. The flow chart of the subroutine SIMPCYC is shown in Figure 3.4. There are four main parameters based on which other cycle parameters are evaluated: the last compressor outlet pressure (i.e. the maximum cycle pressure), the total pressure ratio (i.e. the last compressor outlet pressure divided by the first compressor inlet pressure), the first compressor inlet temperature (i.e. the minimum cycle temperature) and the turbine inlet temperature (i.e. the cycle maximum temperature). Additional parameters are the cooling water inlet temperature, and the heat exchanger geometry. Based on these parameters the compression process can be completely evaluated; therefore the first subroutine called is COMPRESS. Then the program calculates the turbine inlet pressure from: (3-55) ⎛ ∆p ∆p ⎞ ptin =pcout⎜1− rc − r ⎟ ⎝ pmaxrc pmaxr ⎠ 62PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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