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Surface of object

When several cables are present, the mutual radiant area between them must be subtracted from the area radiating to the riser inner surface.

Symbol
$A_{er}$
Unit
m$^2$
Formulas
$\pi D_o$1 cable
$2\left(1-0.182\right) \pi D_o$2 cables touching
$3\left(\pi-0.618\right) D_o$3 cables touching trefoil
$4\left(\pi-0.785\right) D_o$4 cables touching
Related
$D_o$
Outer diameter [m]
$\pi$
Archimedes' constant $\pi$
Used in
$K_r$
Radiation shape factor
$W_{rad,int}$
Radiation heat transfer cable—riser [W/m]