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HEAT TRANSFER 2. A steam pipe, 12 m in length and 10 cm in diameter, is...
Problem 2 (10/30) - Steam at 180 C (saturated) enters a 10 cm diameter, 0.4 mm thick, 150 m long carbon steel pipe which is exposed to the elements. Air flows across the pipe at 10 m/sec. Air emperat...
Problem 2 (10/30) - Steam at 180 C (saturated) enters a 10 cm diameter, 0.4 mm thick, 150 m long carbon steel pipe which is exposed to the elements. Air flows across the pipe at 10 m/sec. Air emperature is 20 C. Convective heat transfer of stem to the pipe is very high. Emissivity of the pipe is estimated at 0.8.Calculate the rate of heat transfer from the pipe. State any assumptions.
Problem 2 (10/30) - Steam at 180 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...
8. An uninsulated steam pipe is used to transport high-temperature steam from one build- ing to...
8. An uninsulated steam pipe is used to transport high-temperature steam from one build- ing to another. The pipe is 0.5 m in diameter, has a surface temperature of 150°C, and is exposed to ambient air at -10°C. The air moves in cross flow over the pipe with a velocity of 5 m/s. What is the rate of heat loss per unit length of pipe?
Saturated steam at 190 °C is to be transported from a boiler to a heat exchanger....
Saturated steam at 190 °C is to be transported from a boiler to a heat exchanger. Due to improper design of existing building, the steam has to flow through a room, where the air temperature inside this room is maintained at 25 °C. The size of this room is very large compared to the size of pipe. The temperature of inner surface of this room is maintained at 30 °C. Below are two options for the shape of pipe: Dimension...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has a temperature of 15°C. The tank is constructed of 10-mm welded steel plate with 12-mm glass lining. The temperature at the inner surface of the glass lining is 50°C. Assume that the convective resistance offered by the air film on the outside of the tank equals the combined resistance of the glass and steel. The thermal conductivity of glass is 0.80 W/mK and that...
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...
use dimensionless equations Problem 1 A pipe of outside diameter d=30 mm is exposed to the...
use dimensionless equations
Problem 1 A pipe of outside diameter d=30 mm is exposed to the cross air flow at 20°C, velocity of the air is 5 m/s, and the temperature of the outside surface of the pipe is 80 °C. Determine: a) An average coefficient of heat transfer from outside surface of the pipe to the air. b) The heat flux exchanged per unit length of the pipe.
S A 10-m-long section of an 8 cm (r=4 cm) of external diameter horizontal steam water...
S A 10-m-long section of an 8 cm (r=4 cm) of external diameter horizontal steam water pipe passes through a large room whose temperature is To =15°C. The pipe is insulated with an insulating material of conductivity k=0.01 W/m-°C and 1 cm thick. If the inner surface temperature of the pipe is 95 °C (at r2) and the pipe is exposed to a cross wind of 6.0 m/s, determine the rate of heat loss from the pipe (neglect radiation). Thermal...
QUESTION 6 A long 6-cm-diameter steam pipe whose external surface temperature is 90°C passes through some...
QUESTION 6 A long 6-cm-diameter steam pipe whose external surface temperature is 90°C passes through some open area that is not protected against the winds. Determine the rate of heat loss from the pipe per unit of its length when the air is at 1 atm pressure and 7"C and the wind is blowing across the pipe at a velocity of 30 km/h. Use k 0.02724 W/m.°C; v- 1.78 x 10 m-/s; Pr 0.7232. Calculate Reynolds Number O 100896.9 O...
ASSIGNMENT 1 BMM35131920/1 QUESTION 3 [10 Marks] a) Briefly discuss the following terms in heat transfer:...
ASSIGNMENT 1 BMM35131920/1 QUESTION 3 [10 Marks] a) Briefly discuss the following terms in heat transfer: i. Blackbody ii. Absorptivity iii. Convection iv. Specific heat v. Thermal conductivity (5 Marks) b) An industrial galvanized pipe (Figure Q3) that carries SiO2 nanofluid as cooling liquid passes through a factory in which the air is at 27°C. The outside diameter of the pipe is 75 mm, and its surface temperature and emissivity are 200 °C and 0.8, respectively. If the coefficient associated...
Problem 2 (10/30) - Steam at 180 C (saturated) enters a 10 cm diameter, 0.4 mm thick, 150 m long carbon steel pipe which is exposed to the elements. Air flows across the pipe at 10 m/sec. Air emperature is 20 C. Convective heat transfer of stem to the pipe is very high. Emissivity of the pipe is estimated at 0.8.Calculate the rate of heat transfer from the pipe. State any assumptions.
Problem 2 (10/30) - Steam at 180 C...
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...
8. An uninsulated steam pipe is used to transport high-temperature steam from one build- ing to another. The pipe is 0.5 m in diameter, has a surface temperature of 150°C, and is exposed to ambient air at -10°C. The air moves in cross flow over the pipe with a velocity of 5 m/s. What is the rate of heat loss per unit length of pipe?
Saturated steam at 190 °C is to be transported from a boiler to a heat exchanger. Due to improper design of existing building, the steam has to flow through a room, where the air temperature inside this room is maintained at 25 °C. The size of this room is very large compared to the size of pipe. The temperature of inner surface of this room is maintained at 30 °C. Below are two options for the shape of pipe: Dimension...
(13) A brewery fermentation tank 12 m in diameter is situated in a room, which has a temperature of 15°C. The tank is constructed of 10-mm welded steel plate with 12-mm glass lining. The temperature at the inner surface of the glass lining is 50°C. Assume that the convective resistance offered by the air film on the outside of the tank equals the combined resistance of the glass and steel. The thermal conductivity of glass is 0.80 W/mK and that...
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...
use dimensionless equations
Problem 1 A pipe of outside diameter d=30 mm is exposed to the cross air flow at 20°C, velocity of the air is 5 m/s, and the temperature of the outside surface of the pipe is 80 °C. Determine: a) An average coefficient of heat transfer from outside surface of the pipe to the air. b) The heat flux exchanged per unit length of the pipe.
S A 10-m-long section of an 8 cm (r=4 cm) of external diameter horizontal steam water pipe passes through a large room whose temperature is To =15°C. The pipe is insulated with an insulating material of conductivity k=0.01 W/m-°C and 1 cm thick. If the inner surface temperature of the pipe is 95 °C (at r2) and the pipe is exposed to a cross wind of 6.0 m/s, determine the rate of heat loss from the pipe (neglect radiation). Thermal...
QUESTION 6 A long 6-cm-diameter steam pipe whose external surface temperature is 90°C passes through some open area that is not protected against the winds. Determine the rate of heat loss from the pipe per unit of its length when the air is at 1 atm pressure and 7"C and the wind is blowing across the pipe at a velocity of 30 km/h. Use k 0.02724 W/m.°C; v- 1.78 x 10 m-/s; Pr 0.7232. Calculate Reynolds Number O 100896.9 O...
ASSIGNMENT 1 BMM35131920/1 QUESTION 3 [10 Marks] a) Briefly discuss the following terms in heat transfer: i. Blackbody ii. Absorptivity iii. Convection iv. Specific heat v. Thermal conductivity (5 Marks) b) An industrial galvanized pipe (Figure Q3) that carries SiO2 nanofluid as cooling liquid passes through a factory in which the air is at 27°C. The outside diameter of the pipe is 75 mm, and its surface temperature and emissivity are 200 °C and 0.8, respectively. If the coefficient associated...
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