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COMPRESS and EXPAND subroutines are written in such a way that they contain the whole compression or expansion process. Inter-cooling and re-heating are inherent parts of the COMPRESS and EXPAND subroutines. Heat exchangers modeled in the code are of the printed circuit heat exchanger (PCHE) type. There are three main heat exchanger subroutines that govern the heat exchanger calculations. Subroutine RECUP evaluates recuperators, subroutine PRECOOLER models the pre-cooler and inter-coolers and subroutine IHX models intermediate heat exchangers. In order to provide the user with flexibility for the parametric analyses as well as the design point calculation, several subroutines were developed to model the heat exchangers. The user can either keep the heat exchanger volume constant and evaluate the pressure drops and outlet temperatures (subroutine PCHEvol) or specify the operating conditions and the basic geometry characteristics and let the code evaluate the length and the pressure drops (subroutine PCHElen). Every power cycle layout has its own subroutine that consists of call statements for the component subroutines, stores the state points of the power cycle, evaluates the cycle efficiency and contains the iteration scheme. The subroutines for the cycles analyzed in this work are readily available for different power cycle layouts should such be developed. Currently available subroutines are SIMPCYC for recuperated Brayton cycles with any number of inter-coolers and re-heaters and RECOMP for the recompression cycles with any number of inter-coolers and re-heaters. The following sections describe the main subroutines. The description of the program CYCLES that governs these subroutines is presented in Section 3.6. 3.2 Subroutines COMPRESS and EXPAND Compressors and turbines are modeled in the code by the subroutines COMPRESS for compressors and EXPAND for turbines. Since both subroutines are very similar they will be described together in this section. The main input parameters for both routines are the inlet temperature and the total pressure ratio across all compressor or turbine components. For example if a single stage 40PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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