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How is Gas Turbine thermal efficiency calculated?

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What data is required and what is the formula

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  1. energy out/energy in = Efficiency


  2. it depends only on the pressure ratio (/temperature ratio) and gas nature:

    n=1 - (1/r)^((gamma-1)/gamma)

    where r=p2/p1(=p3/p4), and

    compressor: 1-2

    turbine: 3-4

  3. you tell me!!!!
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