How do you calculate surface area of a duct elbow 45 degree?

Answer 1

hi

as you know the 45 deg. elbow looks like one quarter of a circle and you have two major radii ( Heel & Throat) ; so :

1st two surfaces( top&bottom) are equals to 0.25*(A1 - A2) where:

A1 = pi*Rh^2 ---- Rh : Heel Radius

A2 = pi * Rt^2 ----- Rt: Throat Radius

2nd Areas ( sides) are equals to rectangular areas ; so it's:

A3 = A4 = W*H ,, Now you have 4 surfaces ,,

Good Luck,,

Moath