Abstract
A systematic, thermodynamically oriented method for design and synthesis of plant utility systems is proposed. Heat requirements are satisfied in preference to power requirements. Taking a combined gas-steam cycle as the most complex plant utility system, several significant new findings are obtained: the thermal efficiency of a gas turbine cycle can be a function of heat input ratio exclusively; a reheating steam cycle may not improve the overall thermal efficiency; and the improvement of overall thermal efficiency due to regenerative heating of the feedwater is effective only when the thermal efficiency of the steam generator is greater than the overall thermal efficiency.
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