What is the efficiency of a turbine if the useful work performed by it is equal

| April 8, 2021 | education

What is the efficiency of a turbine if the useful work performed by it is equal to 1400 MJ, and 100 kg of natural gas was burned to produce steam?

Apol = 1400 MJ = 1400 * 10 ^ 6 J.

m = 100 kg.

λ = 4.4 * 10 ^ 7 J / kg.

Efficiency -?

The efficiency of the turbine The efficiency shows what part of the spent work of Azat goes into useful work of Apol, expressed as a percentage.

Efficiency = Apol * 100% / Azat.

The spent work Azat is the work performed by the heat released during the combustion of gas.

Azat = λ * m, where λ is the specific heat of combustion of the gas, m is the mass of the gas that burned out.

Efficiency = Apol * 100% / λ * m.

Efficiency = 1400 * 10 ^ 6 J * 100% / 4.4 * 10 ^ 7 J / kg * 100 kg = 32%.

Answer: The gas turbine has an efficiency of 32%.



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