A solid sphere of 1 m diameter at 600 K is kept in an evacuated equilateral triangular enclosure (a tetrahedron) whose side length is L. Note that for the sphere to touch the tetrahedron’s surfaces, the tetrahedron’s side length should be L = D√6. The emissivity of the sphere is 0.45 and the temperature of the enclosure is 420 K. If heat is generated uniformly within the sphere at a rate of 3100 W, determine
(a) The view factor from the enclosure to the sphere

(b) The emissivity of the enclosure.

Transcribed Image Text:

T₁ = 600 K &₁ = 0.45 L 1 m L L T₂ = 420 K