Question

Q
3. Saturated steam enters a cooler through a 5.5 cm-ID pipe at 4.6
bar pressure and is converted to water at 30 °C. The liquid is
discharged through a 8.6 cm-ID pipe. Evaluate the heat required to
produce 13.5 m3 /hr of water at exiting conditions in
kilo-watts.

Answer #1

Steam enters a horizontal 14-cm-diameter pipe as a saturated
vapor at 5 bar with a velocity of 10 m/s and exits at 4.5 bar with
a quality of 95%. Heat transfer from the pipe to the surroundings
at 291K takes place at an average outer surface temperature of 400
K. For operation at steady state, determine
(a) the velocity at the exit, in m/s.
(b) the rate of heat transfer from the pipe, in
kW.?
(c) the rate of entropy...

Steam enters a horizontal 14-cm-diameter pipe as a saturated
vapor at 5 bar with a velocity of 10 m/s and exits at 4.5 bar with
a quality of 95%. Heat transfer from the pipe to the surroundings
at 291K takes place at an average outer surface temperature of 400
K. For operation at steady state, determine
(a) the velocity at the exit, in m/s.
(b) the rate of heat transfer from the pipe, in
kW.?
(c) the rate of entropy...

Saturated steam at a gauge pressure of 3.00 bar is to be used to
heat a stream of ethane. The ethane enters a heat exchanger at 16°C
and 1.5 bar gauge pressure at a rate of 895 m3/min and
is heated at constant pressure to 93°C. The steam condenses and
leaves the exchanger as a liquid at 24.0°C. The specific enthalpy
of ethane at the given pressure is 941 kJ/kg at 16°C and 1073 kJ/kg
at 93°C.
You may take...

Liquid water at 24 ºC is fed to a boiler operating at 10 bars
and is converted at constant pressure to saturated
steam. The steam is produced at a steady state flow rate
of 15,000 m3/hr. Assume that the kinetic
energy of the liquid entering the boiler is negligible, and that
the steam is discharged from the boiler through a 15 cm diameter
pipe.
What is the temperature of the saturated steam
(ºC)?
Calculate ∆Ĥ (in units of kJ/kg) for this
process....

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
.

Question 4. Methane enters a 4.2 cm ID pipe at 45°C
and 12 bar with an average velocity of 7
m/s and emerges at a point lower than the inlet at constant
temperature and 9 bar,
i. Calculate the change in Kinetic energy rate, assuming that the
methane behaves ideal gas.
ii. If the heat loss is estimated to be 45 W, calculate the change
in height between the inlet
ad outlet, assuming the change of internal energy is negligible...

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