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Cross-sectional area pipe insulation

Cross-sectional area of the insulation around the pipe in the center of a heat source, e.g. a district heat pipe.

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