Abstract
SYNOPSIS The ecological function, which is defined as the power output minus the power loss (irreversibility), has been optimised with respect to working fluid temperatures and the optimal performance parameters of an irreversible regenerative intercooled Brayton heat engine with direct heat loss are calculated for a typical set of operating conditions. The effects of the source-side effectiveness are found to be greater than those of the other side effectiveness not only on the maximum ecological function but also on the corresponding power output and thermal efficiency. This particular result is different from those obtained by earlier workers available in the literature. Again, the effects of the turbine efficiency are found to be greater than those of the compressor efficiencies on all the performance parameters for the same set of operating conditions. On the other hand, there exist the optimum values of intercooling and cycle pressure ratios at which the cycle attains the maximum ecological function and the corresponding power output and thermal efficiency for a given set of operating parameters.
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