turbine-inlet temperatures of 300 K and 1345 K, respectively. The adiabatic efficiencies of the compressor and turbine are 86 and 89 percent respectively. The gas turbine exhaust, used as the energy source for a steam cycle, leaves the heat exchanger (steam boiler) at 470 K. The inlet conditions to the 85 percent efficient turbine in the steam cycle are 100 bars and 500 ºC. The condenser pressure is 0.10 bars, and the pump is 70 percent efficient. Using constant specific heat properties for air from Table A.5, determine (a) the heat input to the air, in kJ/kg of air, (b) the mass-flow rate ratio of air to steam, in kg-of air/kg of steam, (c) the net work of the gas-turbine cycle,
In a combined gas-steam power cycle the gas-turbine
operates on a 10:1 pressure ratio with compressor and
turbine-inlet temperatures of 300 K and 1345 K,
respectively. The adiabatic efficiencies of the compressor
and turbine are 86 and 89 percent respectively. The gas
turbine exhaust, used as the energy source for a steam cycle,
leaves the heat exchanger (steam boiler) at 470 K. The inlet
conditions to the 85 percent efficient turbine in the steam
cycle are 100 bars and 500 ºC. The condenser pressure is
0.10 bars, and the pump is 70 percent efficient. Using
constant specific heat properties for air from Table A.5,
determine (a) the heat input to the air, in kJ/kg of air, (b) the
mass-flow rate ratio of air to steam, in kg-of air/kg of steam,
(c) the net work of the gas-turbine cycle, in kJ/kg of air, (d)
the net work of the steam cycle, in kJ/kg of steam, and (e)
the overall thermal efficiency of the combined cycle.
(1 bar = 100 KPa)
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