Engineering Homework Help
Engineering Homework Help. 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
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.
Note: Submit your work and calculations, no formal write-up necessary. Individual assignment.
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