A copper hot water pipe (outer diameter ½”) has an exterior temperature of 49oC. For insulation,it...
A copper hot water pipe (outer diameter ½”) has an exterior temperature of 49oC. For insulation,it is wrapped in polyethylene foam that is ½” thick. If the pipe is 12 feet long and runs through a utility room whose temperature is 7oC
Find the rate at which heat is lost through the insulation. Polyethylene foam has a thermal conductivity of 0.024W/(m·K) (Hint: use the outer surface area of the insulation)
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A copper hot water pipe (outer diameter ½”) has an exterior
temperature of 49oC. For insulation,it...
Problem 1. Steam at 120°C is transported in a long 8" outer diameter pipe. Its outer surface is c...
Problem 1. Steam at 120°C is transported in a long 8" outer diameter pipe. Its outer surface is covered with a 1" thick fiberglass (thermal conductivity, 0.05 W/(mK)) insulation. When the outer temperature is 0°C, the rate of condensation of steam is measured to equal 0.06 g per meter of the pipe length. Estimate the heat transfer coefficient. The heat of vaporization of the steam is 2600 J/g. The resistance to the heat transfer through the pipe wall may be...
A cylindrical hot water tank has thermal insulation between an inner and an outer wall of...
A cylindrical hot water tank has thermal insulation between an inner and an outer wall of thin metal sheets, both on the sidewalls and the end walls. The inner diameter and height is 0.95 m and 2.6 m respectively. The insulation thickness is 64 mm and its thermal conductivity is λ = 0.051 [W/mK]. The inner wall consists of 3.0 mm stainless steel with λ = 25 [W/mK], and the outer wall consists of 1.3 mm steel sheet with λ...
Al m diameter sphere is exposed to an en covered with a layer of insulation 2.5...
Al m diameter sphere is exposed to an en covered with a layer of insulation 2.5 cm thick whose thermal conductivity temperature of the sphere on the inside of the insulation is 315ºC. Assuming emissivity of 0.9, compute the value of the conve 's compute the value of the convection heat transfer coefficient that must be maintained on the outer surface of the insulation to ensure that the outer surface not exceed 41°C. exposed to an environmental temperature of 28°C....
Exercise 10 Consider a 2-m-high electric hot water heater that has a diameter of 40 cm...
Exercise 10 Consider a 2-m-high electric hot water heater that has a diameter of 40 cm and maintains the hot water at 55°C. The tank is located in a small room whose average temperature is 27°C, and the heat transfer coefficients on the inner and outer surfaces of the heater are 50 and 12 W/m2.°C, respectively. The tank is placed in another 46-cm-diameter sheet metal tank of negligible thickness, and the space between the two tanks is filled with foam...
Hot CO2 gas at a temperature T-1 = 250°C is flowing through a steel pipe (kı...
Hot CO2 gas at a temperature T-1 = 250°C is flowing through a steel pipe (kı = 70 W/(m.K)) whose inner and outer radiuses are 12 cm and 14 cm, respectively, in a cold environment at Tm2 = -10°C. As shown in the figure below, the steel pipe is insulated with 7.0 cm thick spray-foam insulation (k2 = 0.03 W/(m.K)) and 5.0 cm thick glassfiber insulation (k3 = 0.05 W/(m.K)). Consider the heat transfer coefficients of CO2 gas and the...
Liquid flows in a metal pipe with an inner diameter of D1 = 22 mm and...
Liquid flows in a metal pipe with an inner diameter of D1 = 22 mm and an outer diameter of D2 = 32 mm. The thermal conductivity of the pipe wall is 12 W/m·K. The inner surface of the pipe is coated with thin polyvinylidene chloride (PVDC) lining. Along a length of 1 m, the pipe outer surface is exposed to convection heat transfer with hot gas, at T∞ = 100°C and h = 5 W/m2·K, and thermal radiation with...
Consider a 2-m-high electric hot-water heater that has a diameter of 40 cm and maintains the...
Consider a 2-m-high electric hot-water heater that has a diameter of 40 cm and maintains the hot water at 60 C. The tank is located in a small room at 20°C whose walls and ceiling are at about the same temperature. The tank is placed in a 44-cm-diameter sheet metal shell of negligible thickness, and the space between the tank and the shell is filled with foam insulation. The average temperature and emissivity of the outer surface of the shell...
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...
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...
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 1. Steam at 120°C is transported in a long 8" outer diameter pipe. Its outer surface is covered with a 1" thick fiberglass (thermal conductivity, 0.05 W/(mK)) insulation. When the outer temperature is 0°C, the rate of condensation of steam is measured to equal 0.06 g per meter of the pipe length. Estimate the heat transfer coefficient. The heat of vaporization of the steam is 2600 J/g. The resistance to the heat transfer through the pipe wall may be...
Al m diameter sphere is exposed to an en covered with a layer of insulation 2.5 cm thick whose thermal conductivity temperature of the sphere on the inside of the insulation is 315ºC. Assuming emissivity of 0.9, compute the value of the conve 's compute the value of the convection heat transfer coefficient that must be maintained on the outer surface of the insulation to ensure that the outer surface not exceed 41°C. exposed to an environmental temperature of 28°C....
Exercise 10 Consider a 2-m-high electric hot water heater that has a diameter of 40 cm and maintains the hot water at 55°C. The tank is located in a small room whose average temperature is 27°C, and the heat transfer coefficients on the inner and outer surfaces of the heater are 50 and 12 W/m2.°C, respectively. The tank is placed in another 46-cm-diameter sheet metal tank of negligible thickness, and the space between the two tanks is filled with foam...
Hot CO2 gas at a temperature T-1 = 250°C is flowing through a steel pipe (kı = 70 W/(m.K)) whose inner and outer radiuses are 12 cm and 14 cm, respectively, in a cold environment at Tm2 = -10°C. As shown in the figure below, the steel pipe is insulated with 7.0 cm thick spray-foam insulation (k2 = 0.03 W/(m.K)) and 5.0 cm thick glassfiber insulation (k3 = 0.05 W/(m.K)). Consider the heat transfer coefficients of CO2 gas and the...
Consider a 2-m-high electric hot-water heater that has a diameter of 40 cm and maintains the hot water at 60 C. The tank is located in a small room at 20°C whose walls and ceiling are at about the same temperature. The tank is placed in a 44-cm-diameter sheet metal shell of negligible thickness, and the space between the tank and the shell is filled with foam insulation. The average temperature and emissivity of the outer surface of the shell...
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...
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,...
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