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Determine the engine's thermal efficiency by explicitly computing the work done per cycle.?

Feb 17, 2011 by | Posted in Engineering

A Brayton-cycle heat engine follows the cycle shown in the figure. The heat input from the burning fuel is 2.0 MJ per cycle.
http://session.masteringphysics.com/prob lemAsset/1074113/4/19.P58.jpg
Determine the engine's thermal efficiency

Brayton cycle:

efficiency: η = 1 - To/T = 1 - (P/Po)^(1-γ)/γ = 1 - 10^-(0.4/1.4) = 1 - 0.518 = 0.48

η = Wnet/Qin

Wnet = Wout - Win

To = 300k, => Pr1 = 1.386 atm, h1 = 300.2 kJ/kg

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