A proposed combined cycle power plant is shown below. A gas turbine engine, the

Question

A proposed combined cycle power plant is shown below. A gas turbine engine, the topping cycle, takes air at state 1 (T=300 K, P=100 kPa) and compress it irreversibly (hc=0.87) to state 2. The maximum inlet turbine temperature is 1400 K. The combustor can be modeled as a heat exchanger.   An irreversible turbine (ht=0.87) expands the gas to state 4 where the temperature is 780 K. The gas flow splits and enters two separate counter-flow heat exchangers. The gas is cooled to 470 K by the water in the steam cycle in each heat exchanger (states 5 and 5

Explanation / Answer

the efficiency is

n = 1 - T2/T1

where T2 = 300 K and T1 = 1400 K

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