5.10. A pipe carrying steam at 250°C with and OD of 0.2 m is insulated using...
5.10. A pipe carrying steam at 250°C with and OD of 0.2 m is insulated using a material with conductivity of 0.085 W/mK. The insulation is off-set from the axis by 0.05 m and the OD of the insulation is 0.4 m. Determine the heat loss from the pipe if the outside surface temperature of the insulation is 60°C.
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5.10. A pipe carrying steam at 250°C with and OD of 0.2 m is
insulated using...
A steel pipe carrying saturated steam at 4000 kpa, is 304.8 mm OD. The pipe is...
A steel pipe carrying saturated steam at 4000 kpa, is 304.8 mm OD. The pipe is 150 m long. Temp outside the pipe is 18 degrees C. It is insulated with formed insulation with thermal conductivity of 0.023 W/m/K. If the design is to allow for condensation of 80 kg of steam per hour, how thick must the insulation be?
Exercise 1.16 An insulated district heating pipe with a total diameter d = 0.4 m is laid in the ground at a depth of h = 1.2 m. For a long cold period with an average ground surface temperature o...
Exercise 1.16 An insulated district heating pipe with a total diameter d = 0.4 m is laid in the ground at a depth of h = 1.2 m. For a long cold period with an average ground surface temperature of 0°C and a temperature at the outer edge of the pipe insulation of 20°C, the heat loss per 1km of steam pipe must be calculated. The thermal conductivity of the soil should be assumed to be 0.6 W/mk
Exercise 1.16...
2.24 A pipe of 0.3 m outer diameter at a temperature of 160°C is insulated with...
2.24 A pipe of 0.3 m outer diameter at a temperature of 160°C is insulated with a material having a thermal conductivity of k = 0.055 (1 + 2.8 × 10–3T) W/mK where T is in °C. The outside surface temperature is 40°C. Determine the heat flow/m length and the temperature at the mid radius
Steam at 150 °C flows in a stainless steel pipe which has a thermal conductivity of...
Steam at 150 °C flows in a stainless steel pipe which has a thermal conductivity of 16 W m-1 K -1 whose inner and outer diameters are 5 and 6 cm respectively. The pipe is covered with 3 cm think insulation having a thermal conductivity of 0.035 W m-1 K -1 . The combined convection and radiation heat transfer coefficient at the outside surface of the insulation is 20 W m-2 K -1 and the surroundings are at 10 °C....
a) what is the heat loss per unit length from the pipe in W/m? b) Estimate...
a) what is the heat loss per unit length from the pipe in
W/m?
b) Estimate the heat loss per unit length if a 50 mm thick layer
of insulation with a conductivity of 0.058 W/m K. Neglect radiation
for this part.
3. A 0.20-m diameter, thin-walled steel pipe is used to transport saturated steam at a temperature of 486K in a room for which the air temperature is 25°C and convection heat transfer coefficient at the outer surface of...
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...
3. CIN: A 50 m long section of a steam pipe at 15°C. The average temperature...
3. CIN: A 50 m long section of a steam pipe at 15°C. The average temperature of the outer surface of combined heat transfer coefficient or the rate of heat loss from the steam plp generated in an natural gas furnance $0.52/therm (1 therm = 105, 0.035 W/mK) needed in order to say remain constant at 150°C. (10 marks) For a steam pipe whose outer diameter is 10 cm passes through an open space mperature of the outer surface of...
A 6 in. schedule 80 steel pipe (OD=6.62 in.) will be used to transport 450◦F steam...
A 6 in. schedule 80 steel pipe (OD=6.62 in.) will be used to transport 450◦F steam from a boiler house to a new process unit. The pipe will be buried at a depth of 3 ft (to the pipe centerline). The soil at the plant site has an average thermal conductivity of 0.4 Btu/h · ft · ◦F and the minimum expected ground surface temperature is 20◦F. Estimate the rate of heat loss per foot of pipe length for the...
A pipe with insulation material is used to carry steam to an operating plant. The conditions...
A pipe with insulation material is used to carry steam to an operating plant. The conditions and dimensions for the system are as follows Variable Value Length of pipe, L 100 ft Inner diameter of pipe, Do 1 inch Outer diameter of pipe, D1 1.24 inches Outer diameter of insulation, D2 2 inches Inside film heat transfer coefficient for condensing saturated steam, ho 800 Btu/hr-ft2.oF Outside film heat transfer coefficient for air, ht 2 Btu/hr-ft2.oF Thermal conductivity of the pipe,...
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...
Exercise 1.16 An insulated district heating pipe with a total diameter d = 0.4 m is laid in the ground at a depth of h = 1.2 m. For a long cold period with an average ground surface temperature of 0°C and a temperature at the outer edge of the pipe insulation of 20°C, the heat loss per 1km of steam pipe must be calculated. The thermal conductivity of the soil should be assumed to be 0.6 W/mk
Exercise 1.16...
a) what is the heat loss per unit length from the pipe in
W/m?
b) Estimate the heat loss per unit length if a 50 mm thick layer
of insulation with a conductivity of 0.058 W/m K. Neglect radiation
for this part.
3. A 0.20-m diameter, thin-walled steel pipe is used to transport saturated steam at a temperature of 486K in a room for which the air temperature is 25°C and convection heat transfer coefficient at the outer surface of...
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...
3. CIN: A 50 m long section of a steam pipe at 15°C. The average temperature of the outer surface of combined heat transfer coefficient or the rate of heat loss from the steam plp generated in an natural gas furnance $0.52/therm (1 therm = 105, 0.035 W/mK) needed in order to say remain constant at 150°C. (10 marks) For a steam pipe whose outer diameter is 10 cm passes through an open space mperature of the outer surface of...
A pipe with insulation material is used to carry steam to an operating plant. The conditions and dimensions for the system are as follows Variable Value Length of pipe, L 100 ft Inner diameter of pipe, Do 1 inch Outer diameter of pipe, D1 1.24 inches Outer diameter of insulation, D2 2 inches Inside film heat transfer coefficient for condensing saturated steam, ho 800 Btu/hr-ft2.oF Outside film heat transfer coefficient for air, ht 2 Btu/hr-ft2.oF Thermal conductivity of the pipe,...
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...
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