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Al m diameter sphere is exposed to an en covered with a layer of insulation 2.5...
3. A water heater is covered with insulation boards over a total surface area of 3...
3. A water heater is covered with insulation boards over a total surface area of 3 m. The board is 5.3 centimeter thick. The inside board surface is at 69'C, and the board material has a conductivity of 0.08 W/m-K. If the heat loss is 200 W, determine the outside surface temperature. Given A= 3m? T= 69°C Tonto? K= 0.08 W/mk Q=2oow 4. Determine the total rate of heat transfer from a person standing in a breezy room at 20°C...
A hollow aluminum sphere, with an electrical heater in the center, is used in tests to...
A hollow aluminum sphere, with an electrical heater in the center, is used in tests to determine the thermal conductivity of Insulating materials. The inner and outer radii of the sphere are 0.15 and 0.18 m, respectively, and testing is done under steady-state conditions with the inner surface of the aluminum maintained at 250°C. In a particular test, a spherical shell of Insulation is cast on the outer surface of the sphere to a thickness of 0.12 m. The system...
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...
Animals in cold climates often depend on two layers of insulation: a layer of body fat...
Animals in cold climates often depend on two layers of insulation: a layer of body fat (of thermal conductivity 0.200 W/(m⋅K) ) surrounded by a layer of air trapped inside fur or down. We can model a black bear as a sphere 1.50 m in diameter having a layer of fat 4.00×10−2 m thick, as shown in the figure.(Figure 1) In studies of bear hibernation, it was found that the outer surface layer of the fur is at TC =...
Problem 9.43 The 4 m x 4 m horizontal roof of an uninsulated aluminum melting furnace...
Problem 9.43 The 4 m x 4 m horizontal roof of an uninsulated aluminum melting furnace is comprised of a 0.08-m-thick fireclay brick refractory covered by a 5-mm-thick steel (AISI 1010) plate. The refractory surface exposed to the furnace gases is maintained at 1700 K during operation, while the outer surface of the steel is exposed to the air and walls of a large room at 25 0C. the emissivity of the steel is 0.3. (a) What is...
IF YOU CANNOT SOLVE THEM ALL THEN PLEASE DONT SOLVE ANY. A hollow aluminum sphere, with...
IF YOU CANNOT SOLVE THEM ALL THEN PLEASE DONT SOLVE ANY.
A hollow aluminum sphere, with an electrical heater in the center, is used in tests to determine the thermal conductivity of insulating materials. The inner and outer radii of the sphere are 0.15 and 0.18 m, respectively, and testing is done under steady-state conditions with the inner surface of the aluminum maintained at 250°C. In a particular test, a spherical shell of insulation is cast on the outer surface...
Questions 6-9 The walls of a refrigerator are typically constructed by sandwiching a layer of insulation...
Questions 6-9 The walls of a refrigerator are typically constructed by sandwiching a layer of insulation between sheet metal panels. Consider a wall made from fiberglass insulation of thermal conductivity ki = 0.046 W/mK and thickness Li 50 mm and steel panels, each of thermal conductivity kp = 60 W/m. K and thickness Lp = 3 mm. If the wall separates refrigerated air at Too,i = 4°C from ambient air at T0o,0 = 25°C, what is the heat gain per...
Problem 21–20 pts.: “Kitchen Oven Fiberglass Thickness” • How much fiberglass insulation (k = 0.035 W/m-K)...
Problem 21–20 pts.: “Kitchen Oven Fiberglass Thickness” • How much fiberglass insulation (k = 0.035 W/m-K) is needed to guarantee that the outer-surface temperature of a kitchen oven will not exceed 43°C? 1 The maximum air temperature of a kitchen oven to be maintained by the conventional type of thermostatic control is 290°C. The kitchen (or room) air temperature may vary from 15°C to 35°C, and the average convection heat transfer coefficient between the oven (inner and outer) surfaces and...
a 0.4 m diameter, thin walled steel pipe is used to transport saturated steam Problem 3.049...
a 0.4 m diameter, thin walled steel pipe is used to transport
saturated steam
Problem 3.049 A 0.4-m-diameter, thin-walled steel pipe is used to transport saturated steam at a pressure of 20 bars in a room for which the air temperature is 25°C and the convection heat transfer coefficient at the outer surface of the pipe is 20 W/m2-K. (a) What is the heat loss per unit length from the bare pipe (no insulation)? (b) Estimate the heat loss per...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to cooling airflow at 27 "C resulting in the convective coefficient, h = 114 W/m' K. The relevant properties of mild steel are given as follows: Density p= 7850 kg/m . Specific heat c = 475 J/kg K and thermal diffusivity a = 0.043 m/hr Determine: (i) Time required to cool the sphere (lumped parameter system) from 540 °C to 95°C. [7 marks] (ii)...
3. A water heater is covered with insulation boards over a total surface area of 3 m. The board is 5.3 centimeter thick. The inside board surface is at 69'C, and the board material has a conductivity of 0.08 W/m-K. If the heat loss is 200 W, determine the outside surface temperature. Given A= 3m? T= 69°C Tonto? K= 0.08 W/mk Q=2oow 4. Determine the total rate of heat transfer from a person standing in a breezy room at 20°C...
A hollow aluminum sphere, with an electrical heater in the center, is used in tests to determine the thermal conductivity of Insulating materials. The inner and outer radii of the sphere are 0.15 and 0.18 m, respectively, and testing is done under steady-state conditions with the inner surface of the aluminum maintained at 250°C. In a particular test, a spherical shell of Insulation is cast on the outer surface of the sphere to a thickness of 0.12 m. The system...
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...
IF YOU CANNOT SOLVE THEM ALL THEN PLEASE DONT SOLVE ANY.
A hollow aluminum sphere, with an electrical heater in the center, is used in tests to determine the thermal conductivity of insulating materials. The inner and outer radii of the sphere are 0.15 and 0.18 m, respectively, and testing is done under steady-state conditions with the inner surface of the aluminum maintained at 250°C. In a particular test, a spherical shell of insulation is cast on the outer surface...
Questions 6-9 The walls of a refrigerator are typically constructed by sandwiching a layer of insulation between sheet metal panels. Consider a wall made from fiberglass insulation of thermal conductivity ki = 0.046 W/mK and thickness Li 50 mm and steel panels, each of thermal conductivity kp = 60 W/m. K and thickness Lp = 3 mm. If the wall separates refrigerated air at Too,i = 4°C from ambient air at T0o,0 = 25°C, what is the heat gain per...
Problem 21–20 pts.: “Kitchen Oven Fiberglass Thickness” • How much fiberglass insulation (k = 0.035 W/m-K) is needed to guarantee that the outer-surface temperature of a kitchen oven will not exceed 43°C? 1 The maximum air temperature of a kitchen oven to be maintained by the conventional type of thermostatic control is 290°C. The kitchen (or room) air temperature may vary from 15°C to 35°C, and the average convection heat transfer coefficient between the oven (inner and outer) surfaces and...
a 0.4 m diameter, thin walled steel pipe is used to transport
saturated steam
Problem 3.049 A 0.4-m-diameter, thin-walled steel pipe is used to transport saturated steam at a pressure of 20 bars in a room for which the air temperature is 25°C and the convection heat transfer coefficient at the outer surface of the pipe is 20 W/m2-K. (a) What is the heat loss per unit length from the bare pipe (no insulation)? (b) Estimate the heat loss per...
Q2 (a) A 12 mm diameter mild steel sphere (k = 42.5 W/m K) is exposed to cooling airflow at 27 "C resulting in the convective coefficient, h = 114 W/m' K. The relevant properties of mild steel are given as follows: Density p= 7850 kg/m . Specific heat c = 475 J/kg K and thermal diffusivity a = 0.043 m/hr Determine: (i) Time required to cool the sphere (lumped parameter system) from 540 °C to 95°C. [7 marks] (ii)...
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