Combustion gases enter a gas turbine at 6278C and 1.2 MPa at a rate of 2.5 kg/s and leave at 5278C and 500 kPa. It is estimated that heat is lost from the turbine at a rate of 20 kW. Using air properties for the combustion gases and assuming the surroundings to be at 258C and 100 kPa, determine
(a) The actual and reversible power outputs of the turbine,
(b) The exergy destroyed within the turbine, and
(c) The second-law efficiency of the turbine.

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Exhaust gases 627 C 1.2 MPa Turbine 527"C 500 kPa FIGURE P8-127