Question

A steam turbine has an inlet of 3 kg/s water at 1.2 MPa, 500°C with velocity of 16 m/s. The exit is at 150 kPa, 250°C and very low velocity. Find the power produced and the rate of entropy generation.

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)

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 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....

A steam turbine receives steam from two boilers.
One flow is 5 kg/s at 3 MPa, 700°C and the other flow is 15 kg/s
at 800 kPa, 500°C.
The exit state is 10 kPa, with a quality of 96%.
The actual power output is 22MW.
A steam turbine receives steam from two boilers.
One flow is 5 kg/s at 3 MPa, 700°C and the other flow is 15 kg/s
at 800 kPa, 500°C.
The exit state is 10 kPa, with...

A steam turbine with an isentropic efficiency of 95 % has an
inlet state of 500°C and 4 MPa. At the exit, the pressure is 200
kPa. The exit temperature of the steam (in °C) is:
a. 163.7
b. 139.8
c. 131.4
d. 110.3
e. 812.8

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?...

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.

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 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.

Steam enters an adiabatic turbine at 5 Mpa 500 oC
with a mass flow rate of 2 kg/s and leaves at 100 kpa. The
isentropic efficiency of the turbine is 90%. Find (12
points)
(a) Actual work output of the turbine _______________ (7
points)
b) Maximum work output of the turbine_______________(3
points)
(c) Entropy change during this process
__________________________(2 points)

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