Which outcome reduces a closed-cycle gas turbine's thermal efficiency when turbine inlet temperature is held constant?

💡 Explanation

When discharge pressure of compressor increases in a closed-cycle gas turbine, the compression ratio increases meaning more work is required to compress the gas, reducing the net power output and cycle efficiency because heat input is constant. Therefore, increased compressor discharge pressure results in reduced thermal efficiency, rather than other factors such as exchanger effectiveness, gas properties or humidity which influence heat transfer differently.

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