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3.7 Summary This chapter described the approach to the modeling of closed gas turbine power cycles. The developed code CYCLES evaluates the performance of cycles that consists of compressors, turbines, recuperators and pre-coolers (or inter-coolers). For each of these components subroutines necessary for their modeling were developed and described here. The correlations used for estimation of heat transfer coefficients and friction factors were presented. A wide range of Reynolds numbers ranging from laminar flow to turbulent flow was considered as well as different channel geometry (straight and wavy channels) for the PCHE, which is the only heat exchanger type that can be modeled. Because of the lack of data on heat transfer and friction factor of wavy channels unless otherwise specified straight channels will be used. The component subroutines are used by the cycle subroutines to calculate the performance of different gas turbine cycles. Currently available are Brayton cycle with any number of re-heating and inter-cooling stages (subroutine SIMPCYC) and recompression cycle with any number of re-heating and inter-cooling stages (subroutine RECOMP). The cycle performance calculations done by the cycle subroutines were described and their flow charts were presented. The governing program CYCLES flow chart for the optimization of the simple Brayton cycle was presented to explain the optimization methodology that was used in this work. The main point of the optimization is to correctly allocate the available heat exchanger volume among the cycle heat exchangers and optimize the heat exchanger length to maximize the cycle efficiency and thus minimize the cost of the power plant in $/kWe. 72PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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