nagham98 nagham98

13-09-2022
Physics

contestada

if the temperature of the inner wall 40° and the temperature of the outer side at 20°. Find the heat rate transfer per unit area of the wall if its thickness 250 mm. where is the emissivity factor?
(e=1), 0254 and σ Stephan's constant (o=5.67 x10-8 J/s.m². °K)

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