Abstract
SYNOPSIS An irreversible cycle model of a Brayton heat engine is presented in this paper. The internal irreversibility is due to nonisentropic processes in the compressor and turbine while the external irreversibility is due to finite temperature differences between the external heat reservoirs and the heat engine. The power output is maximised with respect to the working fluid temperatures and the pressure ratio of two isobaric processes. It is found that there are optimal values of the pressure ratio and cycle temperatures at which the power output attains its maximum for a typical set of operating parameters. Some optimum criteria for the important parameters such as power output, thermal efficiency, pressure ratio, temperatures of the working fluid in the two isobaric processes, and heat transfer area ratios, are obtained. The important problems concerning the optimal design and operation of Brayton heat engines are discussed in detail.
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