Question

Air flows steadily through an adiabatic turbine, entering at 1.4 MPa, 600°C, and 178 m/s and leaving at 150 kPa, 200°C, and 210 m/s. The inlet of the turbine is 105 cm2 . Assume that air is an ideal gas with constant specific heat. Given CP = 1.013 kJ/kgK. Estimate: i) the mass flow rate of the air ii) the power output of the turbine, in kW

Answer #1

Steam flows steadily through an adiabatic turbine. The inlet
conditions are: 20 MPa, 500°C, 90 m/s and the exit conditions are
20 kPa, 95% quality, and 60 m/s. The mass flow rate of the steam is
15 kg/s. Find:
a) The change in kinetic energy of the steam, (5 points)
b) The power output, and (5 points)
c) The turbine inlet area. (5 points)

P2) Steam flows steadily through an adiabatic turbine in a power
plant. The inlet conditions of the steam are 6 MPa, 400 °C and 119
cm2 . The exit conditions are 40 kPa, 92 percent quality, 50 m/s
and 20 kg/s. Determine the power output.

A steam turbine has inlet steam pressure p1 = 1.4 MPa
absolute. Inlet steam temperature is T1 = 400
oC. This corresponds to inlet enthalpy per unit mass of
h1 = 3121 kJ/kg. Exit pressure of the steam is p2 = 101
kPa absolute. Exit steam temperature is T2 = 100
oC. This corresponds to exit enthalpy per unit mass of
h2 = 2676 kJ/kg. Inlet speed of the steam is
V1 = 15 m/s and exit speed is V2...

Steam enters an adiabatic turbine at 7 MPa, 700 °C and
80 m/s and leaves at 50 kPa, 150 °C, and 140 m/s. If the power
output of the turbine is 6 MW, determine:
i) Mass
flowrate of the steam flowing through the
turbine.
ii) The
isentropic efficiency of the turbine.

Air is expanded isentropically in an adiabatic turbine, to
produce 115 kW of power. If the mass flow rate is 0.75 kg/s, and
the air at the exit is 500 K and 155 kPa, then what is the
temperature and pressure at the inlet of the turbine?
(a) The temperature is? K
(b) The pressure is? kPa
NOTE: Do NOT approximate the air as having a constant specific
heat.

Consider an adiabatic turbine. At steady mass flow rate of 10
kg/s, steam enter the turbine at 4.5 MPa, 600°c and 85 m/s and
leaves the turbine at 40 kPa, quality of 0.8 and 50 m/s. Determine
:
a) the power output
b) the turbine inlet area

Steam enters an adiabatic turbine at 5 MPa and 700°C at a rate
of 18.6 kg/s. The steam leaves the turbine at 50 kPa and 200°C.
What is the rate of work produced by the turbine in MW? What is the
rate of change of entropy of the steam during this process in kW/K?
If the turbine is reversible and adiabatic and the steam leaves at
50 kPa, what is the rate of work produced by this turbine in MW?...

air pressure of 103 kPa., entering the compressor at a
temperature of 15 degrees Celsius and a low speed. 1 mPa pressure,
336 degrees Celsius temperature and 106 m / s speed is coming out
of the compressor. The compressor is cooled by air at a temperature
of 15 degrees Celsius and 26 kW. The power input to the compressor
is 298 kW. (cp= 1.005kj/kgK , R=0.287 kj/kgK)
a) Find the mass flow of air
b) calculate the irreversibility in...

Steam at 4.5 MPa and 500 C enters the turbine with a velocity of
60 m/s and its mass flow rate is 5,000 kg/h. The steam leaves the
turbine at a point 3m below the turbine inlet with a velocity of
350 m/s. The heat loss from the turbine is 100,000 kJ/hr and the
shaft work produced is 950hp. A small portion of the exhaust steam
from the turbine is passed through a throttling valve and
discharges at atmospheric pressure....

1) A nozzle is a device for increasing the velocity of a
steadily flowing stream of fluid. At the inlet to a certain nozzle
the enthalpy of the fluid is 3025 kJ/kg and the velocity is 60 m/s.
At the exit from the nozzle the enthalpy is 2790 kJ/kg. The nozzle
is horizontal and there is negligible heat loss from
it.
(i) Find the velocity at the nozzle exit.
(ii) If the inlet area is 0.1 m2 and specific volume...

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