Homework Answers
![for Air at 3434 [From Heat & maps Transfer Data book] - fluid properties at 3u3k (for Air.) k= Thermal Conductivity -0.02981](http://img.homeworklib.com/questions/07317320-70cf-11eb-9c52-23f8c1321a73.png?x-oss-process=image/resize,w_560)
![* be 238.926x 0·02981 0.5 3 ha 14.2447 - m2K 12,25 W m2K Heat transfer & (8) 3 [8= h, As c Ts- Tos] Newtons law of cooling *](http://img.homeworklib.com/questions/0851dff0-70cf-11eb-b721-5b3c4f7b83c4.png?x-oss-process=image/resize,w_560)
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8. An uninsulated steam pipe is used to transport high-temperature steam from one build- ing to...
A horizontal uninsulated steam pipe passes through a large room whose walls and ambient air are...
A horizontal uninsulated steam pipe passes through a large room whose walls and ambient air are at 300 K. The pipe of 125-mm diameter has an emissivity of 0.85 and an outer surface temperature of 373 K. Calculate the rate of heat loss per unit length from the pipe. The answer should be close to 45.2 W/m Please show all work clearly
HEAT TRANSFER 2. A steam pipe, 12 m in length and 10 cm in diameter, is...
HEAT TRANSFER 2. A steam pipe, 12 m in length and 10 cm in diameter, is exposed to the cross flow of air at 5°C with the velocity of 25 km/h. The surface of the pipe is maintained at 75°C and its emissivity is estimated to be 0.8. The surrounding temperature is at 0°C. Determined the total heat loss from the pipe.
An uninsulated metal sphere with a diameter of 1 cm has a surface temperature of 30...
An uninsulated metal sphere with a diameter of 1 cm has a surface temperature of 30 °C, and is exposed to flow of water at 0 °C. The water moves in cross flow over the sphere with a velocity of 0.1 m/s. Determine the heat loss from the sphere.
HELP MEEE An uninsulated steam pipe passes through a room where the temperatures of the air...
HELP MEEE
An uninsulated steam pipe passes through a room where the temperatures of the air and its walls are 38 degrees. The outer diameter of the pipe is 90 mm, the temperature and spreading rate of its surface are 200 degrees and 0.8, respectively. Calculate the radiating power of the surface and the radiation to the surface. Since the heat transfer coefficient with natural convection from the surface to the air is 25 w/m^2.K, what is the heat loss...
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.
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...
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...
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...
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...
HEAT TRANSFER 2. A steam pipe, 12 m in length and 10 cm in diameter, is exposed to the cross flow of air at 5°C with the velocity of 25 km/h. The surface of the pipe is maintained at 75°C and its emissivity is estimated to be 0.8. The surrounding temperature is at 0°C. Determined the total heat loss from the pipe.
An uninsulated metal sphere with a diameter of 1 cm has a surface temperature of 30 °C, and is exposed to flow of water at 0 °C. The water moves in cross flow over the sphere with a velocity of 0.1 m/s. Determine the heat loss from the sphere.
HELP MEEE
An uninsulated steam pipe passes through a room where the temperatures of the air and its walls are 38 degrees. The outer diameter of the pipe is 90 mm, the temperature and spreading rate of its surface are 200 degrees and 0.8, respectively. Calculate the radiating power of the surface and the radiation to the surface. Since the heat transfer coefficient with natural convection from the surface to the air is 25 w/m^2.K, what is the heat loss...
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.
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...
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...
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...
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...
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