Discussion Forum
Que.  The shape factor for complete rectangular furnace is
Where a, b and c are the inside dimensions and d x is the wall thickness 
a.  2/ d x (a b + b c + c a) + 4 (0.64) (a + b +c) + 8 (0.45) d x 
b.  2/ d x (a b + b c + c a) + 4 (0.44) (a + b +c) + 8 (0.35) d x 
c.  2/ d x (a b + b c + c a) + 4 (0.34) (a + b +c) + 8 (0.25) d x 
d.  2/ d x (a b + b c + c a) + 4 (0.54) (a + b +c) + 8 (0.15) d x 
Correct Answer:2/ d x (a b + b c + c a) + 4 (0.54) (a + b +c) + 8 (0.15) d x
