A combined gas turbine-vapor power plant operates. Steady- state data at principal states of the cycle are given in the table below. An air-standard analysis is assumed for the gas turbine in which the air passing through the combustor receives energy by heat transfer at a rate of 50 MW. Except for the combustor, all components operate adiabatically. Kinetic and potential energy effects are negligible. Determine: (a) The mass flow rates of air, steam, and cooling water, each in kg/s (b) The net power developed by the gas turbine cycle and the vapor cycle, respectively, each in MW (c) The thermal efficiency of the combined cycle (d) A full accounting of the net exergy increase of the air passing through the combustor of the gas turbine, mair [ef3 – ef2], in MW, and the exergetic efficiency of the combined cycle. Compute the exergetic efficiency both assuming 30 % exergy destruction in combustor and ignoring that exergy destruction. Let To = 300 K, po = 100 kPa.
A combined gas turbine-vapor power plant operates. Steady-
state data at principal states of the cycle are given in the table below. An air-standard analysis
is assumed for the gas turbine in which the air passing through the combustor receives energy
by heat transfer at a rate of 50 MW. Except for the combustor, all components operate
adiabatically. Kinetic and potential energy effects are negligible. Determine:
(a) The mass flow rates of air, steam, and cooling water, each in kg/s
(b) The net power developed by the gas turbine cycle and the vapor cycle, respectively,
each in MW
(c) The thermal efficiency of the combined cycle
(d) A full accounting of the net exergy increase of the air passing through the combustor of
the gas turbine, mair [ef3 – ef2], in MW, and the exergetic efficiency of the combined
cycle. Compute the exergetic efficiency both assuming 30 % exergy destruction in
combustor and ignoring that exergy destruction.
Let To = 300 K, po = 100 kPa.
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