# Thermal Efficiency & BWR of the A-S Brayton Cycle

Recall that the performance of a power cycle can be measured by its

### thermal efficiency

, η.## Back Work Ratio

:The fraction of the work produced by the turbine that is consumed by the compressor.

40% - 80%

1% - 2%

Back Work Ratio for gas power cycles:

Back Work Ratio for vapor power cycles:

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