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Cross-sectional area fluid-filled pipe

Cross-sectional area of the pipe in the center of a heat source inside which the fluid is flowing, e.g. water in a district heat pipe.

Symbol
$A_{hsp}$
Unit
mm$^2$
Formulas
$\frac{\pi}{4} \left({Do_{hsp}}^2-{Di_{hsp}}^2\right)$
Related
$Di_{hsp}$
Inner diameter fluid-filled pipe [mm]
$Do_{hsp}$
Outer diameter fluid-filled pipe [mm]
$\pi$
Archimedes' constant $\pi$