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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),
and o Stephan's constant (0 = 5.67 x10 -8 J/s.m?.94)

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 m class=

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