An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers areF 11 = 0.1F 12 = 0.4F 13 = 0.25The surface areas A 1 and A 2 are 4 m2 and 2 m2. The view factor F 41 is

An enclosure consists of four surfaces 1, 2, 3 and 4. The view factor

1.	An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers areF 11 = 0.1F 12 = 0.4F 13 = 0.25The surface areas A 1 and A 2 are 4 m2 and 2 m2. The view factor F 41 is
A.	0.5
B.	0.75
C.	0.1
D.	0.25
Answer» B. 0.75

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An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers areF 11 = 0.1F 12 = 0.4F 13 = 0.25The surface areas A 1 and A 2 are 4 m2 and 2 m2. The view factor F 41 is

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