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The gas-turbine cycle of a combined gas-steam power plant has a pressure ratio of 8. Air enters the compressor at 290 K and the turbine at 1400 K. The combustion gases leaving the gas turbine are used to heat the steam at 15 MPa to 450°C in a heat exchanger. The combustion gases leave the heat exchanger at 247°C. Steam expands in a high-pressure turbine to a pressure of 3 MPa and is reheated in the combustion chamber to 500°C before it expands in a low-pressure turbine to 10 kPa. The mass flow rate of steam is 30 kg/s. Assuming all the compression and expansion processes to be isentropic, determine
(a) The mass flow rate of air in the gas-turbine cycle,
(b) The rate of total heat input, and
(c) The thermal efficiency of the combined cycle.
for one-dimensional steady state conduction in cylindrical or spherical shell without heat generation is the radical
the edges of a thin plate are held at the temperature described below. determine the steady-state temperature
a cylinder of radius a is balanced on top of a fixed cylinder of radius b b gt a . if the balance is slightly
The ball is kicked from point A with the initial velocity vA=10m/s. Determine the range R, and the speed when the ball strikes the ground
Air is compressed by 10.50-kW compressor form P1 to P2. The air temperature is maintained constant at 26ºC during this process as a result of heat transfer to the surrounding medium at 10ºC. Determine the rate of entropy change of the air.
you are designing a remote-area power supply based on a miniature wind turbine that is 20 efficient. meteorological
What is the minimum possible curvature of the glass layer of the thickness L before it cracks (fig. 3.33), if the critical tensile stress is σ* and the Young modulus is E? On which surface does the crack initiate?
Three springs anda mass are attached to a rigid, weightless bar PQ hinged at one end. How do I find the natural frequency?
Assuming the average rate of heat dissipation from people in an exercise room is 525 W determine the rate of heat gain of the exercise room from people and the equipment at peak load conditions.
for temperatures between 300 and 1000 k and at 1 atm the molar specific enthalpy of o2 is expressed by the following
steam at 1 mpa with a quality of 0.8 passes through a throttling device that causes the pressure to rapidly drop to 200
a flat plate solar collector is to be considered as a means to drive a pump to irrigate crops. this will be used in
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