5.3.3.5 Exergy Destructions in Brayton Cycle Power Plants

Estimation of exergy destructions in Brayton cycles is of major importance because they affect in significant measure the efficiency of power generators. One special issue results from the fact that the backwork ratio of Brayton cycles is relatively high. Consequently, the isentropic efficiency of turbomachinery dramatically affects the cycle performance. In a Brayton cycle, the turbo-compressors and the turbines must have isentropic efficiency of over 80% for reasonable economic viability of the power plant. Besides the irreversibility of turbomachinery, there are important irreversibilities related to heat transfer across finite temperature differences and due to pressure drop in ducts ...

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