A pipe made of stainless steel (k = 45 W / m*K) with an internal diameter...
A pipe made of stainless steel (k = 45 W / m*K) with an internal diameter of 5 cm and an outer diameter of 5.5 cm is carrying a fluid at a temperature of 80 °C. The heat transfer coefficient for the fluid inside the pipe is 1000 W / m2 *K. The heat transfer coefficient of the air is 5 W / m2 *K and the air at a substantial distance from the pipe is at 25 °C.
At steady-state:
a. Determine the temperature [°C] on the surface of the pipe.
b. Determine the heat lost per meter of pipe [W / m].
c. For insulation with a thermal conductivity of 0.1 W / m*K, determine the insulation thickness required to achieve a 20% decrease in the heat loss.
d. Repeat part c for insulation with a thermal conductivity of 0.05 W / m*K
Homework Answers
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A pipe made of stainless steel (k = 45 W / m*K) with an internal
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A stainless pipe having an inner wall thickness of 5 cm, an outer wall thickness of 5.5 cm and a thermal conductivity of 15 W/m˚C transfers steam at 320˚C from one location to another. The pipe is insulated with a 3 cm thick glass wool having a thermal conductivity of 0.038 W/m˚C. Heat is lost to the surroundings by natural convection and radiation at a rate of 15 W/m2˚C and the heat transfer coefficient inside the pipe is 80 W/m2˚C....
Steam at 150 °C flows in a stainless steel pipe which has a thermal conductivity of...
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art II- Show your work 17 Marks team at 320°C flows in a stainless steel pipe (kr 15 W/m "C) whose inner and outer diameters are 5 em and 5.5 cm, respectively. The pipe is covered with 3-cm-thick glass wool insulation (k 0.038 W m·°C). Heat is lost to the surroundings at 5°C by natural convection and radiation, with a combined natural convection and radiation heat transfer coefficient of hi-15 w/m.。C. The convective heat transfer coefficient inside the pipe to...
B Steam flows in a steel pipe, which is insulated by gypsum plaster. The inner and...
B Steam flows in a steel pipe, which is insulated by gypsum plaster. The inner and outer diameter of the pipe are 8 cm and 6 cm respectively with pipe length of 20-m. The thickness of gypsum plaster which wraps the pipe is 4 cm. The heat transfer coefficient of the inner pipe and outer insulation are 800 W/m2.°C and 200 W/m2.°C with inner pipe temperature of 200°C and outer insulator temperature of 10°C. The thermal conductivity of the pipe...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm is covered with an insulation material [k 0.2 W/(m. C)] of thickness 2 cm. A hot gas at 320°C with a heat transfer coefficient of 200 W/(m2.C) flows inside the tube. The outer surface of the insulation is exposed to cooler air at 20°C with a heat transfer coefficient of 50 W/(m2·°C). Calculate a) The heat loss from the tube to the air for...
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the oute...
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the outer surface is insulated. Air flows through the central pipe with a mass flow rate, ma0.026 kg/s. Water flows through the annular region with a mass flow rate, mw-0.58 kg/s. At the given position along the pipe the bulk temperature of the air, Ta-100°C, and the bulk temperature of the water, Tw- s 10°C. The thermal conductivity of stainless steel, kss 15 W/mK....
Problem : A cryogenic flui d is flowing in a 304 SS pipe. The pipe is...
Problem
:
A cryogenic flui
d is flowing in a
304 SS
pipe.
The pipe is insulated
on its outside surface
with
6
-
mm thick,
evacuated,
aluminum foil/glass mat insulation.
(“Evacuated” means a partial vacuum is drawn on the
insulation to
remove air that would otherwise fill
pores inside the insulation.)
The pipe
inside diameter
is 127 mm; it’s outside diameter is 138 mm.
The
fluid temperature is
-
173
o
C
.
T
he
air temperature
outside the...
H8-1: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k-15 W/m K) i...
H8-1: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k-15 W/m K) is used to store iced water at 0°C. The tank is located in a room whose temperature is 25°C. The convection heat transfer coefficients at the inner and the outer surfaces of the tank are 80 W/m2 K and 10 W/m2 K, respectively. Radiatior heat transfer is negligible. Determine the rate of heat transfer to the iced water in the tank. room 25°0c T. Iced water 0...
2-157 A long electrical resistance wire of radius r.-0.25 cm has a thermal conductivity kwire-15 W/m-K. Heat is gene...
2-157 A long electrical resistance wire of radius r.-0.25 cm has a thermal conductivity kwire-15 W/m-K. Heat is generated uniformly in the wire as a result of resistance heating at a constant rate of 0.5 W/cm3. The wire is covered with polyethylene insulation with a thickness of 0.25 cm and thermal conductivity of ks 0.4 W/m K. The outer surface of the insulation is subjected to free convection in air at 20°C and a convection heat transfer coefficient of 2...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water i...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water in the pipe is um-0.31 m/s and the bulk temperature is 323 K (density 988 kg m-3; viscosity 0.00055 kg m' sı. Pr 3.56, thermal conductivity k 0.64 W m1 Kt). The material of the pipe has thermal conductivity k 0.61 W...
art II- Show your work 17 Marks team at 320°C flows in a stainless steel pipe (kr 15 W/m "C) whose inner and outer diameters are 5 em and 5.5 cm, respectively. The pipe is covered with 3-cm-thick glass wool insulation (k 0.038 W m·°C). Heat is lost to the surroundings at 5°C by natural convection and radiation, with a combined natural convection and radiation heat transfer coefficient of hi-15 w/m.。C. The convective heat transfer coefficient inside the pipe to...
B Steam flows in a steel pipe, which is insulated by gypsum plaster. The inner and outer diameter of the pipe are 8 cm and 6 cm respectively with pipe length of 20-m. The thickness of gypsum plaster which wraps the pipe is 4 cm. The heat transfer coefficient of the inner pipe and outer insulation are 800 W/m2.°C and 200 W/m2.°C with inner pipe temperature of 200°C and outer insulator temperature of 10°C. The thermal conductivity of the pipe...
1. A steel tube [k 15 W/(m.°C)] of outside diameter 7.6 cm and thickness 1.3 cm is covered with an insulation material [k 0.2 W/(m. C)] of thickness 2 cm. A hot gas at 320°C with a heat transfer coefficient of 200 W/(m2.C) flows inside the tube. The outer surface of the insulation is exposed to cooler air at 20°C with a heat transfer coefficient of 50 W/(m2·°C). Calculate a) The heat loss from the tube to the air for...
3. The annular pipe arrangement shown in the figure below is made of stainless steel and the outer surface is insulated. Air flows through the central pipe with a mass flow rate, ma0.026 kg/s. Water flows through the annular region with a mass flow rate, mw-0.58 kg/s. At the given position along the pipe the bulk temperature of the air, Ta-100°C, and the bulk temperature of the water, Tw- s 10°C. The thermal conductivity of stainless steel, kss 15 W/mK....
Problem
:
A cryogenic flui
d is flowing in a
304 SS
pipe.
The pipe is insulated
on its outside surface
with
6
-
mm thick,
evacuated,
aluminum foil/glass mat insulation.
(“Evacuated” means a partial vacuum is drawn on the
insulation to
remove air that would otherwise fill
pores inside the insulation.)
The pipe
inside diameter
is 127 mm; it’s outside diameter is 138 mm.
The
fluid temperature is
-
173
o
C
.
T
he
air temperature
outside the...
H8-1: An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k-15 W/m K) is used to store iced water at 0°C. The tank is located in a room whose temperature is 25°C. The convection heat transfer coefficients at the inner and the outer surfaces of the tank are 80 W/m2 K and 10 W/m2 K, respectively. Radiatior heat transfer is negligible. Determine the rate of heat transfer to the iced water in the tank. room 25°0c T. Iced water 0...
2-157 A long electrical resistance wire of radius r.-0.25 cm has a thermal conductivity kwire-15 W/m-K. Heat is generated uniformly in the wire as a result of resistance heating at a constant rate of 0.5 W/cm3. The wire is covered with polyethylene insulation with a thickness of 0.25 cm and thermal conductivity of ks 0.4 W/m K. The outer surface of the insulation is subjected to free convection in air at 20°C and a convection heat transfer coefficient of 2...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water in the pipe is um-0.31 m/s and the bulk temperature is 323 K (density 988 kg m-3; viscosity 0.00055 kg m' sı. Pr 3.56, thermal conductivity k 0.64 W m1 Kt). The material of the pipe has thermal conductivity k 0.61 W...
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