Homework Answers
Description of concept of view factor and then view factor for given 2D geometry is solved as below.
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3 3 3 O 2 The width or the rectangular enclosure is 30 cm and the...
5. (20) A furnace is in the form of a two-dimensional channel having width W and height H and 4W-3H. Top part of the furnace is open to large surroundings that are at T3 The sides and bottom are heat...
5. (20) A furnace is in the form of a two-dimensional channel having width W and height H and 4W-3H. Top part of the furnace is open to large surroundings that are at T3 The sides and bottom are heated electrically to maintain at temperatures T1 and T2 respectively (a) Calculate F and Fs from the relation given in problem 3 Note that surface 1 consists of two panels (left and righ) b) Draw the network representations for radiative exchange...
1. Compute all view factors associated with the following 2D geometry. 3 3 اليا O 2...
1. Compute all view factors associated with the following 2D geometry. 3 3 اليا O 2 The width or the rectangular enclosure is 30 cm and the height of the enclosure is 20 cm. The diameter of surface 1 is 1 cm. The center of surface 1 is 1 diameter above the bottom surface.
QUESTION 6 Consider a 30-cm x 30-cm x 30-cm cubical body at 1000 °C suspended in...
QUESTION 6 Consider a 30-cm x 30-cm x 30-cm cubical body at 1000 °C suspended in the air. Assuming the body closely approximates a blackbody, determine the rate at which the cube emits radiation energy, i n kW 30.6 80.4 61.4 324.2 134.7 QUESTION 7 Determine the hydraulic diameter (Dh) of the duct (pipe) section shown in the following figure. (Assume: b 40 and h 20) 43.8 57.6 48.1 66.2 (8-11) Consider the arrangement of the three black surfaces shown...
Consider a long duct constructed with diffuse and gray walls. The width of each wall is...
Consider a long duct constructed with diffuse and gray walls.
The width of each wall is 1 m. Heat transfer is from surface 1 to
surface 2, while surface 3 is completely insulated and cannot
absorb heat (which means q3 = 0).
Provide a sketch and state your assumptions
Determine the net radiation transfer from surface A1 per unit
length of the duct.
Determine the temperature of the insulated surface A3.
Use 1 sentence to describe the effect of changing...
Consider a long duct constructed with diffuse and gray walls. The width of each wall is...
Consider a long duct constructed with diffuse and gray walls. The width of each wall is 1 m. Heat transfer is from surface 1 to surface 2, while surface 3 is completely insulated and cannot absorb heat (which means 93 = 0). Az, T2 = 700 K, Ez = 0.5 A4, T1 = 1000 K, £z = 0.33- -A3, T3 , £z = 0.8 a. Provide a sketch and state your assumptions b. Determine the net radiation transfer from surface...
heat transfer question Consider a long duct constructed with diffuse and gray walls. The width of...
heat transfer question
Consider a long duct constructed with diffuse and gray walls. The width of each wall is 1 m. Heat transfer is from surface 1 to surface 2, while surface 3 is completely insulated and cannot absorb heat (which means 93 = 0). A2, T2 = 700 K, £= 0.5 Aj, T1 = 1000 K, £1 = 0.33 -A2, T3, E3 = 0.8 a. Provide a sketch and state your assumptions b. Determine the net radiation transfer from...
A particular snake enclosure features a spherical heating bulb, with a radius of 3 cm and...
A particular snake enclosure features a spherical heating bulb, with a radius of 3 cm and surface temperature of 305 K, centred 10 cm above the enclosure floor. a) If a snake was coiled up directly below the bulb such that it had a coil radius of 8 cm, and absorbed 11 % of any incident radiation, calculate how much energy the snake would absorb from the bulb per second. You may assume that the air absorbs a negligible amount...
PLEASE ANSWER a,b,c Heat Conduction Heat conduction occurs through any material, represented here by a rectangular...
PLEASE ANSWER a,b,c
Heat Conduction Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. The temperature of the material is T2 on the left and T1 on the right, where T2 is greater than T1. The rate of heat transfer by conduction is directly proportional to the surface area A, the temperature difference T2 - T1, and the substance's conductivity k. The rate of heat transfer is inversely proportional to the...
Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or...
Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. The temperature of the material is T2 on the left and T1 on the right, where T2 is greater than T1. The rate of heat transfer by conduction is directly proportional to the surface area A, the temperature difference T2 - T1, and the substance's conductivity k. The rate of heat transfer is inversely proportional to the thickness d. Q kA (T2-T)...
3. (40pts) A furnace is shaped like a long equilateral triangular duct where the width of...
3. (40pts) A furnace is shaped like a long equilateral triangular duct where the width of each side is 2 m. Heat is supplied from the base surface, whose emissivity is £1 = 0.8, at a rate of 800 W/m² while the side surfaces, whose emissivities are 0.5, are maintained at 500 K. Neglecting the end effects, determine the temperature of the base surface. Can you treat this geometry as a two-surface enclosure? Ta = 500 K Ez = 0.5...
5. (20) A furnace is in the form of a two-dimensional channel having width W and height H and 4W-3H. Top part of the furnace is open to large surroundings that are at T3 The sides and bottom are heated electrically to maintain at temperatures T1 and T2 respectively (a) Calculate F and Fs from the relation given in problem 3 Note that surface 1 consists of two panels (left and righ) b) Draw the network representations for radiative exchange...
1. Compute all view factors associated with the following 2D geometry. 3 3 اليا O 2 The width or the rectangular enclosure is 30 cm and the height of the enclosure is 20 cm. The diameter of surface 1 is 1 cm. The center of surface 1 is 1 diameter above the bottom surface.
QUESTION 6 Consider a 30-cm x 30-cm x 30-cm cubical body at 1000 °C suspended in the air. Assuming the body closely approximates a blackbody, determine the rate at which the cube emits radiation energy, i n kW 30.6 80.4 61.4 324.2 134.7 QUESTION 7 Determine the hydraulic diameter (Dh) of the duct (pipe) section shown in the following figure. (Assume: b 40 and h 20) 43.8 57.6 48.1 66.2 (8-11) Consider the arrangement of the three black surfaces shown...
Consider a long duct constructed with diffuse and gray walls.
The width of each wall is 1 m. Heat transfer is from surface 1 to
surface 2, while surface 3 is completely insulated and cannot
absorb heat (which means q3 = 0).
Provide a sketch and state your assumptions
Determine the net radiation transfer from surface A1 per unit
length of the duct.
Determine the temperature of the insulated surface A3.
Use 1 sentence to describe the effect of changing...
Consider a long duct constructed with diffuse and gray walls. The width of each wall is 1 m. Heat transfer is from surface 1 to surface 2, while surface 3 is completely insulated and cannot absorb heat (which means 93 = 0). Az, T2 = 700 K, Ez = 0.5 A4, T1 = 1000 K, £z = 0.33- -A3, T3 , £z = 0.8 a. Provide a sketch and state your assumptions b. Determine the net radiation transfer from surface...
heat transfer question
Consider a long duct constructed with diffuse and gray walls. The width of each wall is 1 m. Heat transfer is from surface 1 to surface 2, while surface 3 is completely insulated and cannot absorb heat (which means 93 = 0). A2, T2 = 700 K, £= 0.5 Aj, T1 = 1000 K, £1 = 0.33 -A2, T3, E3 = 0.8 a. Provide a sketch and state your assumptions b. Determine the net radiation transfer from...
PLEASE ANSWER a,b,c
Heat Conduction Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. The temperature of the material is T2 on the left and T1 on the right, where T2 is greater than T1. The rate of heat transfer by conduction is directly proportional to the surface area A, the temperature difference T2 - T1, and the substance's conductivity k. The rate of heat transfer is inversely proportional to the...
Heat conduction occurs through any material, represented here by a rectangular bar, whether window glass or walrus blubber. The temperature of the material is T2 on the left and T1 on the right, where T2 is greater than T1. The rate of heat transfer by conduction is directly proportional to the surface area A, the temperature difference T2 - T1, and the substance's conductivity k. The rate of heat transfer is inversely proportional to the thickness d. Q kA (T2-T)...
3. (40pts) A furnace is shaped like a long equilateral triangular duct where the width of each side is 2 m. Heat is supplied from the base surface, whose emissivity is £1 = 0.8, at a rate of 800 W/m² while the side surfaces, whose emissivities are 0.5, are maintained at 500 K. Neglecting the end effects, determine the temperature of the base surface. Can you treat this geometry as a two-surface enclosure? Ta = 500 K Ez = 0.5...
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