Question

A 10-m3 vessel is being filled with steam at 0.8 MPa and 400°C. It enters the tank through a 0.05 m radius pipe. Calculate the rate at which the density in the tank is varying when the steam velocity in the pipe is 20 m/s and choose the nearest value

a. None

b. 0.16 (kg/m3)/s

c. 0.08 (kg/m3)/s

d. 0.12 (kg/m3)/s

e. 0.04 (kg/m3)/s

Answer #1

Answer: option e

Solution

A 10-m3 vessel is being filled with steam at 0.8 MPa
and 400°C. It enters the tank through a 0.05 m radius pipe.
Calculate the rate at which the density in the tank is varying when
the steam velocity in the pipe is 20 m/s and choose the nearest
value

Steam at 250oC and 1 MPa enters a compressor at a steady rate of
2 m3 /s with a velocity of 0.1 m/s. The device uses 6500 kJ/s of
energy to compress the steam to a temperature of 500oC and a
pressure of 4 MPa. Assuming that this device is adiabatic and that
you can ignore potential energy changes, calculate the steam
velocity and mass flow rate at the exit of the compressor.

A 1.2 m3 rigid tank initially contains steam at 8 MPa and 400
◦C. The steam slowly comes out through a hole at the bottom until
the pressure drops to P0 while
keeps the temperature constant. Making the pertinent considerations
determines:
a) the heat transferred, in kJ when P0 = 2 MPa.
b) graph the heat transfer, in kJ, versus P0 from 0.5 to 8.0
MPa

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....

Steam enters an adiabatic turbine at 1 MPa and 400 °C and leaves
at 150 kPa with a quality of 80 percent. Neglecting the changes in
kinetic and potential energies, determine the mass flow rate
required for a power output of 10 MW

Hot water vapor at 3.5 MPa and 400 C values enters an
adiabatic nozzle with a 5 cm2 entrance cross section at a speed of
50 m / s and exits the nozzle with values of 2 MPa and 300 m / s.
Calculate the temperature that the steam will have when leaving the
nozzle and the entropy production per second accompanying this
process.
Q-W=Σṁç(hç+Vç2/2+gzç)- Σṁg(hg+Vg2/2+gzg), ṁ = ρVA, ρ = 1/v, Sġ
-Sç̇ +Süṙ =∆S/∆t

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 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?...

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.

Steam enters a control volume operating at steady state at 3 bar
and 160 ◦ C with a volumetric flow rate of 0.5 m3 /s. Saturated
liquid leaves the control volume through exit #1 with a mass flow
rate of 0.1 kg/s, and saturated vapor leaves through exit #2 at 1
bar with a velocity of 5 m/s. Determine the area of exit #2, in m2
.

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