Question

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 m^{3}/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.****Calculate the heat input (kJ/hr) to meet the needed saturated steam production rate.**

Answer #1

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.

Problem 1) Steam at 10 bar and 330°C is fed to an adiabatic
turbine at a mass flow rate of m = 5kg /s • . The output stream is
saturated steam at 1.1 bar. The inlet steam flows through a 15 cm
diameter pipe and the exit steam discharges through a 20 cm
diameter pipe. a) Calculate the velocity of the input and output
streams in m/s. b) The power generated by the turbine in kW.

Hot water is required as utility in a certain bioprocess. 10,000
g/h water at 28oC enters an open heating tank, where heated up to
80oC. 11% of this water is lost from the system via
evaporation.
a. Construct the mass balance in order to calculate how much
water is evaporated and how much water is leaving the tank.
b. What must be the rate of heat input to the system at
steady-state?
h (liquid water at 28oC) = 117.3 kJ/kg...

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...

A fuel gas consists of 75% butane (C4H10), 10% propane (C3H8)
and 15% butene (C4H8) by volume. It is to be fed to the combustion
chamber in 10% excess air at 25ºC, where it is completely burnt to
carbon dioxide and water. The flue gases produced are to be used to
generate 5 bar steam from water at 90ºC.
(a) Write balanced equations for the combustion of each
component of the fuel gas.
(b) Explain the need for excess air....

Data for carbon dioxide:
Molecular weight:44.0
Heat capacity of gas phase: 0.036+4.23
x10-5T (in kJ/moleoC, T is
in oC)
Viscosity Pr k
(W/m K)
180oC2.13 x10-5kg/(m
s) 0.721 0.029
130oC 1.93x10-5kg/(m
s) 0.738 0.025
80oC 1.72x10-5kg/(m
s) 0.755 0.020
Approximate density: 2.0 kg/m3
Data for water:
Molecular weight:18.0
Heat capacity for liquid water: 0.0754 kJ/mole
oC
Viscosity:
Viscosity Pr k
(W/m K)
180oC139 x10-6kg/(m
s) 0.94 0.665
130oC 278x10-6kg/(m
s) 1.72 0.682
80oC 472x10-6kg/(m
s) 3.00 0.658
Ideal gas constant:
0.08206 L atm/(mol K)
Carbon dioxide, with flow rate of 0.10 kg/s, is to be cooled
from 180 oC to 80...

A grey body is one whose absorptivity
1. does not vary with temperature and wavelength of the incident
ray
2. is equal to its emissivity
3. varies with temperature
4. varies with wavelength of the incident ray
A liquid is in equilibrium with its vapor at its boiling point.
On an average, the molecules in the liquid and gaseous phases have
equal
1. potential energy.
2. kinetic energy.
3.temperature. 4. intermolecular forces of attraction.
A liquid of density 1000 kg/m3...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 5 minutes ago

asked 12 minutes ago

asked 35 minutes ago

asked 35 minutes ago

asked 40 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago

asked 3 hours ago