In: Mechanical Engineering

The heat transfer coefficient of a steel (k = 43 W/m · K) tube
(1.9 cm ID and 2.3 cm OD) in a shell-and-tube heat exchanger is 500
W/m2 · K on the inside and 120 W/m2 · K on the shell side, and it
has a deposit with a total fouling factor of 0.000176 m2 · K/W.
Calculate

a. The overall heat transfer coefficient

b. The cleanliness factor, and percent over surface.

A steel pipe (k = 43 W/m K) carries a heat‐transfer fluid and is
covered with a 2‐cm layer of calcium silicate insulation (k = 0.029
W/m K) to reduce the heat loss. The inside and outside pipe
diameters are 5.25 cm and 6.03cm, respectively. If the inner pipe
surface is at 150°C and the exterior surface of the insulation is
at 25°C, calculate: (a) The rate of heat loss per unit length of
pipe (b) The temperature of the...

Water flows at 112°C through a steel pipe (k=90 W/m °C) which
has a 6 cm inside diameter and 8cm outside diameter. Such that, hi
=346 W/m2 °C and ho =6.0 W/m2 °C. Surrounding air temperature is
20°C. To reduce heat loss to the surroundings the pipe is covered
with an insulation insulation having the thickness of 4.0 mm and
k=0,5W/m°C . Calculate;
a. The heat loss by convection per unit length from
the bare pipe (before insulation).
b....

Steam at a temperature of 280 DegreeC flows in a steel pipe
(k=70 W/m K) having an inner and outer diameter of 5 cm and 5.6 cm.
The pipe is covered with glass wool insulation (k=0.05 W/m K) to a
thickness of 4 cm. On a windy day heat is lost from the lagging
surface with a convective heat transfer coefficient of 50
W/m2 K. The surroundings are at a temperature of 5
DegreeC and the internal heat transfer coefficient...

Heat transfer
In a test in a double tube heat exchanger the following data are
obtained
For hot fluid
Flow = 11.6 gal / sec
Outlet temperature = 30.1 ° C
Inlet temperature = 32 ° C
For cold fluid
Flow 11gal / min
Outlet temperature 25.1 ° C
Inlet temperature 24.2 ° C
For the fluid consider
k = 0.49 w / mK
cp = 3729.95 J / kgK
Prandtl number = 14.29
Density = 1035.02kg / m3
Get:...

Heat transfer
in a test in a double tube heat exchanger the following data are
obtained
For hot fluid
Flow = 11.6 gal / sec
Outlet temperature = 30.1 ° C
Inlet temperature = 32 ° C
For cold fluid
Flow 11gal / min
Outlet temperature 25.1 ° C
Inlet temperature 24.2 ° C
For the fluid consider
k = 0.49 w / mK
cp = 3729.95 J / kgK
Prandtl number = 14.29
Density = 1035.02kg / m3
Get:...

A furnace wall is composed of three layers: 15 cm of firebrick
[k = 1.5 W/(m*K)], followed by 22.5 cm of kaolin insulation brick [
k = 0.075 W/(m*K)], and finally followed by 4 cm of masonry brick [
k = 1.0 W/(m*K)]. The temperature of the inner wall surface
(firebrick) is 1400 K and the outer surface (masonry brick) is at
350 K. Assume each layer has an area normal to the direction of
heat flow equal to 1...

3. A stainless steel sphere of thermal conductivity 16 W/m · K
with a diameter of 4 cm is exposed to a convective environment of
15 W/m2 · K, 20?C. Heat is generated uniformly in the sphere at a
rate of 1.0 MW/m3 . Determine the steady-state temperature of the
sphere at its center and its surface. Also determine the heat flux
at a radius of 1.5 cm.

Convection Heat transfer internal flow
Consider water flowing in a heated tube. The tube is 14 m long
with an inner diameter of 1 cm. The heat
is added at 1500 W/m2 uniformly along the tube. Water flows at 0.3
m/s. Use the following water property
? = 1000 kg/m3, ? = 1.4 × 10?3 kg/m·s, cp =
4.2 kJ/kg·K, k = 0.58 W/m·K, and determine
1. Heat transfer coefficient at the tube exit.
2. Tube surface temperature at the...

Heat Transfer in a Steel Pan A medium sized steel pan is used to
boil water on top of an electric range. Approximately 85% of the
1000 W produced by the heating unit is transferred nearly uniformly
into the pot during use. Express the most appropriate form of the
heat diffusion equation that describes the heat transfer through
the bottom section of the pan. Include all relevant boundary
conditions. The bottom section of the pan has a thickness of 0.5...

A circumferential fin (k= 55 W/m C) of thickness 3 mm and length
3 cm is attached to a pipe of diameter 3 cm. The fin is exposed to
a convection environment at 23 C with h=25 W/m2 oC. The fin base
temperature is 223 C. Calculate the heat lost (qf) by the fin.

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