Intercooling in gas turbines (a) decreases net output but...

Intercooling in gas turbines
(a) decreases net output but increases thermal efficiency
(b) increases net output but decreases thermal efficiency
(c) decreases both net output and thermal efficiency
(d) increases both net output and thermal efficiency

Key Concepts

Net Output

Net output in a gas turbine cycle is the difference between the work produced by the turbine and the work consumed by the compressor. Since intercooling reduces the compressor work, it results in an increase in this net output, contributing to overall improved performance of the gas turbine system.

Thermal Efficiency

Thermal efficiency in a thermodynamic cycle is defined as the ratio of the net work output to the heat input. By reducing the amount of work needed for compression through intercooling, the net output increases relative to the heat supplied, leading to an improvement in the cycle's thermal efficiency.

Intercooling

Intercooling is a process used primarily in multi-stage compression systems where the working fluid is cooled between the stages of compression. This cooling reduces the work required for subsequent compression by lowering the fluid’s temperature, which in turn decreases the specific volume and results in a more efficient compression process.

Gas Turbine Cycle

The gas turbine cycle, often represented by the Brayton cycle, involves the processes of air compression, combustion, expansion through a turbine, and exhaust. Enhancements such as intercooling are applied to improve the cycle’s performance by reducing the compressor work input, thereby having a direct impact on the overall cycle efficiency and net work output.

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