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SYNOPSIS A general cycle model of a class of typical irreversible heat engines with temperature-dependent heat capacities of the working substance is established. The expressions for work output and efficiency of the heat engines are derived. The influence of variable heat capacities of the working substance, heat leak losses, compression and expansion efficiencies and other parameters on the optimal performance of the cycle is investigated. The optimum criteria of some important parameters are obtained and the optimal operating regions of the heat engines are determined. The optimum performance of several typical heat engines is directly derived. The results obtained may provide some theoretical guidance for the performance improvement and optimal design of real heat engines.
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Liu et al. (2010) studied this question.
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