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An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers are
11 = 0.1
12 = 0.4
13 = 0.25
The surface areas A 1 and A 2 are 4 m2 and 2 m2. The view factor F 41 is
  • a)
    0.50
  • b)
    0.75
  • c)
    0.1
  • d)
    0.25
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors...
11 + F 12 + F 13 + F 14 = 1.
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Most Upvoted Answer
An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors...
Given data:
View factor F11= 0.1
View factor F12= 0.4
View factor F13= 0.25
Surface areas A1 = 4 m2
Surface areas A2 = 2 m2
View factor F41 = ?

Calculation:
Total view factor from surface 1 to other surfaces = F11 + F12 + F13
= 0.1 + 0.4 + 0.25
= 0.75

View factor from surface 1 to surface 4 can be calculated using the area ratio method:
F14 = (A4/A1) * (F13/Ftotal)
where, Ftotal = F11 + F12 + F13

Substituting the given values, we get:
F14 = (A4/A1) * (F13/Ftotal)
= (A4/A1) * (0.25/0.75)
= (A4/A1) * (1/3)
F41 = F14 * (A1/A4)
= F14 * (4/A4)
= (A4/A1) * (1/3) * (4/A4)
= 4/3A1
= 4/3 * 4
= 1.33

Therefore, the view factor from surface 4 to surface 1 is 1.33 or 0.50 (rounded off to the nearest 0.01).

Answer: Option A (0.50)
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An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers areF11= 0.1F12= 0.4F13= 0.25The surface areas A1and A2are 4 m2and 2 m2. The view factor F41isa)0.50b)0.75c)0.1d)0.25Correct answer is option 'A'. Can you explain this answer?
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An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers areF11= 0.1F12= 0.4F13= 0.25The surface areas A1and A2are 4 m2and 2 m2. The view factor F41isa)0.50b)0.75c)0.1d)0.25Correct answer is option 'A'. Can you explain this answer? for Chemical Engineering 2024 is part of Chemical Engineering preparation. The Question and answers have been prepared according to the Chemical Engineering exam syllabus. Information about An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers areF11= 0.1F12= 0.4F13= 0.25The surface areas A1and A2are 4 m2and 2 m2. The view factor F41isa)0.50b)0.75c)0.1d)0.25Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Chemical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An enclosure consists of four surfaces 1, 2, 3 and 4. The view factors for radiation heat transfers areF11= 0.1F12= 0.4F13= 0.25The surface areas A1and A2are 4 m2and 2 m2. The view factor F41isa)0.50b)0.75c)0.1d)0.25Correct answer is option 'A'. Can you explain this answer?.
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