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3.5.2 Subroutine RECOMP Subroutine RECOMP is in many aspects similar to the subroutine SIMPCYC. There is a new parameter that has to be evaluated compared to the standard Brayton cycle, and that is the recompressed fraction, i.e. the fraction of flow that does not go through the pre-cooler, but is recompressed in the recompression compressor and fed to the high temperature recuperator inlet. The flow chart of the subroutine RECOMP is shown in Figure 3.5. The subroutine starts again by evaluating the compression process and establishing the turbine pressure ratio in the same manner as in the subroutine SIMPCYC. Given the results for the main compressor the recompression compressor performance is established based on the same pressure ratio as was used for the main compressor and the inlet temperature equal to the main compressor outlet temperature increased by 5oC (a reasonable minimum temperature difference for the low temperature recuperator). The turbine inlet and outlet pressures are estimated in the same manner as in the case of the SIMPCYC subroutine from: (3-63) (3-64) where the suffix rlh stands for the hot side of the low temperature recuperator, the suffix rhh stands for the hot side of the high temperature recuperator, the suffix rlc stands for the cold side of the low temperature recuperator and the suffix rhc stands for the cold side of the high temperature recuperator. 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 pressures the turbine pressure ratio is known and the subroutine EXPAND can be called. After evaluating the turbine outlet conditions the next step is the estimation of the recuperators. In the recompression cycle there are high and low temperature recuperators. Therefore, even if the effectiveness of both of these recuperators is known ⎛∆p ∆p ∆p⎞ ptin = pcout ⎜1− rlc − rhc − r ⎟ ⎝ pmaxrlc pmaxrhc pmaxr ⎠ ⎛∆p ∆p ∆pp⎞ ptout = pcin ⎜1− rlh − rhh − ⎟ ⎝ pmaxrlh pmaxrhh pmaxp ⎠ 67PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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