Thermodynamics HW Solutions 906

Thermodynamics HW Solutions 906 - We note that A 1 = A 3...

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Chapter 12 Radiation Heat Transfer 12-8 The view factors between the rectangular surfaces shown in the figure are to be determined. Assumptions The surfaces are diffuse emitters and reflectors. Analysis From Fig. 12-6, 24 . 0 5 . 0 2 1 1 5 . 0 2 1 31 3 = = = = = F W L W L W = 2 m (2) L 2 = 1 m L 1 = 1 m L 3 = 1 m A 3 (3) A 2 A 1 (1) and 29 . 0 1 2 2 5 . 0 2 1 ) 2 1 ( 3 2 1 3 = = = + = = + F W L L W L
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Unformatted text preview: We note that A 1 = A 3 . Then the reciprocity and superposition rules gives 0.24 = = ⎯→ ⎯ = 31 13 31 3 13 1 A F F F A F 05 . 24 . 29 . 32 32 32 31 ) 2 1 ( 3 = ⎯→ ⎯ + = ⎯→ ⎯ + = + → F F F F F Finally, 0.05 = = ⎯→ ⎯ = 32 23 3 2 F F A A 12-3...
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