Exhaust combustion products flow through a concentric square composite (k = 0.85 W/m·K) channel of unit...
Exhaust combustion products flow through a concentric square composite (k = 0.85 W/m·K) channel of unit length. The edge of the outer square is b = 6 cm and the inner edge is a = 2 cm. The duct is placed in a corridor such that the air temperature is 300 K with a convection coefficient of 75 W/m2·K. The exhaust gases maintain a uniform inner channel surface temperature of 500 K.
a) Using numerical methods, find the temperature distribution in the wall and the heat loss per unit length from the channel for a grid spacing of ?x = ?y = 1 cm. (Note that symmetry will reduce the numerical calculation to 9 nodes).
b) Compare the heat loss of part (a) to the result found from a shape factor calculation.
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Exhaust combustion products flow through a concentric square
composite (k = 0.85 W/m·K) channel of unit...
A flue passing hot exhaust gases has a square cross section, 300 mm to a side....
A flue passing hot exhaust gases has a square cross section, 300
mm to a side. The walls are constructed of refractory brick 150 mm
thick with a thermal conductivity of 1.6 W/m·K. Calculate the heat
loss from the flue per unit length when the interior and exterior
surfaces are maintained at 350 and 25°C, respectively. Use a grid
spacing of 75 mm. Assume the temperature in nodes 2 and 3 are given
as T2 = 108.3°C, T3 =
162.2°C....
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
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...
Please help me with this problem 2. A composite cylinder is formed by a long cylindrical...
Please help me with this problem
2. A composite cylinder is formed by a long cylindrical rod (A) and two concentric cylinders (tubes B and C). Tube B encloses trod A and its inner and outer radii are 20 mm and 40 mm, respectively. Tube C encloses tube B and its outer radius is 50 mm. A thin electrical heater is inserted between rod A and tube B. The rod (A) has a thermal conductivity of 2.5 w/m K, while...
A tube with length of 1 m is made from steel (k 15 W/m/K) having a...
A tube with length of 1 m is made from steel (k 15 W/m/K) having a square cross section with a circular hole through the center, as shown below Calculate the steady state temperature distribution across the cross section and the total rate of heat transfer if the inner surface is held at 20 °C, and the outer surface is held at 100 °C. How does the heat rate vary with grid resolution? Consider 9 and 17 grid points across...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool insulation [k-0.05 W/ m°C]. Heat is lost to the surroundings at Too,2 - 21°C by natural convection and radiation, with a combined heat transfer coefficient of h- 18 W/m2 °C. Taking the heat transfer coefficient inside the pipe to...
summatize the following info and break them into differeng key points. write them in yojr own...
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
summarizr the followung info and write them in your own words and break them into different...
summarizr the followung info and write them in your own words and break them into different key points. 6.5 Metering Chamber: 6.5.1 The minimum size of the metering box is governed by the metering area required to obtain a representative test area for the specimen (see 7.2) and for maintenance of reasonable test accuracy. For example, for specimens incorporating air spaces or stud spaces, the metering area shall span an integral number of spaces (see 5.5). The depth of...
A flue passing hot exhaust gases has a square cross section, 300
mm to a side. The walls are constructed of refractory brick 150 mm
thick with a thermal conductivity of 1.6 W/m·K. Calculate the heat
loss from the flue per unit length when the interior and exterior
surfaces are maintained at 350 and 25°C, respectively. Use a grid
spacing of 75 mm. Assume the temperature in nodes 2 and 3 are given
as T2 = 108.3°C, T3 =
162.2°C....
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
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...
Please help me with this problem
2. A composite cylinder is formed by a long cylindrical rod (A) and two concentric cylinders (tubes B and C). Tube B encloses trod A and its inner and outer radii are 20 mm and 40 mm, respectively. Tube C encloses tube B and its outer radius is 50 mm. A thin electrical heater is inserted between rod A and tube B. The rod (A) has a thermal conductivity of 2.5 w/m K, while...
A tube with length of 1 m is made from steel (k 15 W/m/K) having a square cross section with a circular hole through the center, as shown below Calculate the steady state temperature distribution across the cross section and the total rate of heat transfer if the inner surface is held at 20 °C, and the outer surface is held at 100 °C. How does the heat rate vary with grid resolution? Consider 9 and 17 grid points across...
Problem 3 (30): Steam at Too,1 340 °C flows in a cast iron pipe [k- 80 W/m.°C] whose inner and outer diameter are Di 6 cm and D2 -8 cm, respectively. The pipe is covered with a 4-cm thick glass wool insulation [k-0.05 W/ m°C]. Heat is lost to the surroundings at Too,2 - 21°C by natural convection and radiation, with a combined heat transfer coefficient of h- 18 W/m2 °C. Taking the heat transfer coefficient inside the pipe to...
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
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