Question

In casting furnace, the combustion gases are separated from
the

surrounding air by a wall with a thickness of 12 cm, 1.2
W/m.K, and 0.85

as emissivity. Calculate the inner surface of the wall since
the outer

surface temperature of the inner wall, where the air has 273 K
and 25

2

W/? . ? as a coefficient of convective heat transfer.

Problem #2 (5 points)

Expect that

Answer #1

The wall of an industrial furnace is constructed from a fireclay
brick layer which is covered with another layer of ordinary brick.
The outer surface wall temperature has a steady-state temperature
of 110 °C when the ambient air has a temperature of 20°C. Heat is
lost from the outer surface wall via convection and radiation. The
internal furnace wall has a surface temperature of 500 DegreeC.
Convection heat transfer coefficient between outer wall and air:
5 W/m2K
Stefan-Boltzmann constant σ:...

hot flue gases at 373oC is flowing theough a circular chimney,
1.2 m outer radius made from brick with thickness 20 cm. the
ambient air is at 27oC. calculate the heat transfer from hot flue
gas to ambient air. take convective heat transfer coefficient for
the flue gas and ambient air as 50 and 15W/m^K respectively. given
chimney height 20 m. tale conductivity of brick wall 10W/mK

A flat wall is exposed to an environmental temperature of 38
degrees C. The wall is covered with a layer of insulation 2.5 cm
thick whose thermal conductivity is 1.8 W/(m.K), and the
temperature of the wall on the inside of the insulation is 320
degrees C. The wall loses heat to the environment by convection.
Compute the value of the convection heat transfer coefficient that
must be maintained on the outer surface of the insulation to ensure
that the...

(Heating Transfer)
- A wall with a heat transmission coefficient of 2 W /
mK; thickness, width and height values are all 1 m (wall
thickness 1 m and heat transfer area 1 mx 1 m = 1 m ^ 2) In the
continuous regime, the relevant wall with inner surface temperature
of 2000 K and outer surface temperature of 1000 K , unit Calculate
the heat passing in time.
(Admissions: one dimensional heat conduction and
constant heat conduction coefficient...

In a warehouse, a cold room that is maintained at
10oC has a wall made of two layers of
materials. The inner layer has a thickness of 2 cm and a thermal
conductivity of 0.1 W/mK. The outer layer, which is 4 cm thick, has
a thermal conductivity of 0.04 W/mK. The temperature of the outside
ambient is 30oC . The convective heat transfer
coefficients on the outside and the inside of the wall are 40
W/m2K and 20 W/m2K...

Combustion gases passing through a 2.3-cm-internal diameter
circular tube are used to vaporize waste water at atmospheric
pressure. Hot gases enter the tube at 115 kPa and 250°C at a mean
velocity of 5 m/s, and leave at 150°C. If the average heat transfer
coefficient is 120 W/m2 °C and the inner surface temperature of the
tube is 112°C, determine the tube length. Answer in cm with two(2)
decimal places.

a. Discuss why car inside temperature is high when you park the
car outside in a sunny day even under the shade and the relation
with glass transmissivity (Greenhouse effect). [5 marks]
b. A double walled spherical tank is used to store iced water at
O'C. The tank internal diameter is 2 m and wall thickness is 0.5
cm. The inner and outer walls are separated with the 2 cm thick
space. The air between the two walls of the...

In a coal fired power plant, a furnance Wall consists
of a 125 mm wide refractory brick and a 125 mm wide insulating
firebrick separated by an air gap as shown in figure. The outside
Wall is covered with a 12 mm thickness of plaster. The inner
surface of Wall is at 1100 °C, and then room temp is 25 °C. The
Heat transfer coefficient from the outside Wall surface to air in
room is 17 W/m^2 K, resistance to...

The
wall of an industrial furnace is constructed from unknown material
with 0.5 m . Measurements made during steady state operation reveal
temperature at the inner and outer surface, respectively. What is
the rate of heat loss through a wall that is 2 m X 3.5 m on a side
Abstract:
Introduction:
Results
Material A Material B Material C
∆? K q ∆? K q ∆? K q
Each box has three rows
And Graphic representation for x axis...

2.1Consider a solid cylindrical rod of length 0.15 m and
diameter 0.05 m. The top and bottom surfaces of the rod are
maintained at constant temperatures of 20oC and 95oC, respectively,
while the side surface is perfectly insulated. 2.1.1 Draw a diagram
to represent the situation described above. (3) 2.1.2 Determine the
rate of heat transfer through the rod if it is made of copper, k =
380 W/m? oC. (4) 2.1.3 Determine the rate of heat transfer through
the...

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