Engineering, 05.03.2021 21:20 ili28

A combined cycle power plant has a net power output of 311 MW. Air enters the compressor of the Brayton cycle at 100 kPa and 37oC. The pressure ratio is 22, the turbine inlet temperature is 1640 K and the gases leaving the turbine are used to heat the steam of the Rankine cycle to 600oC and 5 MPa. The combustion gas leaves the heat exchanger (HRSG) at 420 K and the condenser pressure is 20 kPa. The isentropic efficiency of the compressor is 85%, the gas turbine isentropic efficiency is 88%, the steam turbine isentropic efficiency is 90% and the pump efficiency is 61%. The condenser sub-cools the water by 10oC (10oC less than the saturation temperature). Using variable specific heat analysis, determine:Rate of heat input in the combustion chamber, Qin in kW. Rate of heat transfer in the HRSG, in kW. Power input to the pump, in kW. Power input to the compressor, in kW. Net power output from the Brayton cycle, in kW. Net power output from the Rankine cycle, in kW. Overall efficiency.

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A combined cycle power plant has a net power output of 311 MW. Air enters the compressor of the Bray...

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