13-56 Consider two rectangular surfaces perpendicular to each other with a common edge which is 1.6 m long. The horizontal surface is 0.8 m wide, and the vertical surface is 1.2 m high. The horizontal surface has an emissivity of 0.75 and is maintained at 450 K. The vertical surface is black and is maintained at 700 K. The back sides of the surfaces are insulated. The surrounding surfaces are at 290 K and can be considered to have an emissivity of 0.85. Determine the net rate of radiation heat transfer between the two surfaces and between the horizontal surface and the surroundings. FIGURE P13–56 Tz= 700 K e2 = 1 W = 1.6 m T3 = 290 K E3= 0.85 Lz= 1.2 m A2 L1 = 0.8 m A1 Tj = 450 K €1 = 0.75
13-56 Consider two rectangular surfaces perpendicular to each other with a common edge which is 1.6 m long. The horizontal surface is 0.8 m wide, and the vertical surface is 1.2 m high. The horizontal surface has an emissivity of 0.75 and is maintained at 450 K. The vertical surface is black and is maintained at 700 K. The back sides of the surfaces are insulated. The surrounding surfaces are at 290 K and can be considered to have an emissivity of 0.85. Determine the net rate of radiation heat transfer between the two surfaces and between the horizontal surface and the surroundings. FIGURE P13–56 Tz= 700 K e2 = 1 W = 1.6 m T3 = 290 K E3= 0.85 Lz= 1.2 m A2 L1 = 0.8 m A1 Tj = 450 K €1 = 0.75
Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Transcribed Image Text:13-56 Consider two rectangular surfaces perpendicular to each other with a common edge which is 1.6 m long. The horizontal surface is 0.8 m wide, and the vertical surface is 1.2 m high. The horizontal
surface has an emissivity of 0.75 and is maintained at 450 K. The vertical surface is black and is maintained at 700 K. The back sides of the surfaces are insulated. The surrounding surfaces are at 290 K and
can be considered to have an emissivity of 0.85. Determine the net rate of radiation heat transfer between the two surfaces and between the horizontal surface and the surroundings.
FIGURE P13–56
Tz= 700 K
e2 = 1
W = 1.6 m
T3 = 290 K
E3= 0.85
Lz= 1.2 m
A2
L1 = 0.8 m
A1
Tj = 450 K
€1 = 0.75
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