EE 703 · Chapter 6
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An open cycle gas turbine plant uses heavy oil. Max pressure=500 kPa, max temperature=650°C. Air at 10⁵ Pa, 27°C enters compressor. Isentropic efficiencies of compressor and turbine are 80% and 85%. Find thermal efficiency. If plant consumes 5 kg/s fuel, find power generating capacity. Take Cp=1 kJ/kg°C and γ=1.4.
A gas turbine has overall pressure ratio 5:1 and maximum cycle temperature 550°C. Mechanical efficiency of drive=0.97, ambient temperature=20°C, isentropic efficiencies of compressor and turbine=0.8 and 0.83. Calculate power output for 15 kg/s air flow, thermal efficiency, and work ratio.
A gas turbine unit has a pressure ratio of 6:1 and maximum cycle temperature of 610°C. The isentropic efficiencies of the compressor and turbine are 0.80 and 0.82 respectively. Calculate the power output in kW of an electric generator geared to the turbine when air enters the compressor at 15°C at the rate of 16 kg/s. Take Cp=1.005 kJ/kg·K and γ=1.4 for compression, and Cp=1.11 kJ/kg·K and γ=1.333 for expansion.