A 8000 kW gas-turbine power plant operates with single stage compression, two-stage expansion and with a reheating process. The high pressure turbine drives the compressor and the low pressure turbine produces the net work output. Atmospheric air enters the compressor at 27 oC and the combustion gasses enter the high pressure turbine at 927oC. The combustion gasses leaving the high pressure turbine is reheated back to 827 oC before expanding in the low pressure turbine. The overall pressure ratio is 9. The isentropic efficiency of each turbine is 85% and the isentropic efficiency of the compressor is 90%. Sketch the schematic diagram and the temperature-entropy (T-s) diagram of the cycle. Determine i. the heat supplied to the system, kJ/kg ii. the net work, kJ/kg iii. the thermal efficiency, % iv. the work ratio v. the mass flow rate of the gasses, kg/s. For air take cpa = 1.005 kJ/kgK and a = 1.4 and for the gasses take cpg = 1.15 kJ/kgK and g = 1.33
A 8000 kW gas-turbine power plant operates with single stage compression, two-stage
expansion and with a reheating process. The high pressure turbine drives the compressor and
the low pressure turbine produces the net work output. Atmospheric air enters the compressor
at 27 oC and the combustion gasses enter the high pressure turbine at 927oC. The combustion
gasses leaving the high pressure turbine is reheated back to 827 oC before expanding in the low
pressure turbine. The overall pressure ratio is 9. The isentropic efficiency of each turbine is
85% and the isentropic efficiency of the compressor is 90%. Sketch the schematic diagram and
the temperature-entropy (T-s) diagram of the cycle. Determine
i. the heat supplied to the system, kJ/kg
ii. the net work, kJ/kg
iii. the thermal efficiency, %
iv. the work ratio
v. the mass flow rate of the gasses, kg/s.
For air take cpa = 1.005 kJ/kgK and a = 1.4 and for the gasses take
cpg = 1.15 kJ/kgK and g = 1.33
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