Probabilistic Assessment and Optimization of the Second law efficiency of an Intercooled-Reheat- Regenerative Brayton Cycle Coupled to Variable Temperature Heat Reservoirs

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Author(s) Vishal Anand | Krishna Nelanti
Pages 718-734
Volume 2
Issue 10
Date October, 2013
Keywords Brayton Cycle; Second law analysis; Intercooling; reheating; regeneration; lost work; entropy analysis; probabilistic; variable temperature reservoirs.
Abstract

Thermodynamic analysis, pertaining to the Second law efficiency, of an intercooled, reheat, regenerative and irreversible Brayton cycle, coupled to variable temperature heat reservoirs, is presented in this paper. The Second law efficiency is found to first increase and then decrease, with increase in reheat pressure ratio. This means that there is an optimum value of Second law efficiency. This optimum Second law efficiency is found to be an increasing function of the components’ efficiencies, the heat exchangers’ effectiveness and heat capacitance rate of the working fluid, and a decreasing function of the heat capacitance rates of the external fluid. The thermal efficiency, at the optimized reheat pressure ratio, also follows a similar trend. The reasons behind these trends have been discussed in detail. A probabilistic assessment of the Second law efficiency is carried out, giving the relative impact of the various design parameters on the Second law efficiency.

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