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Inner diameter fluid-filled pipe

Inner diameter 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
$Di_{hsp}$
Unit
mm
Used in
$A_{hsf}$
Cross-sectional area fluid [mm$^2$]
$A_{hsp}$
Cross-sectional area fluid-filled pipe [mm$^2$]
$Do_{hsp}$
Outer diameter fluid-filled pipe [mm]
$T_{hsp}$
Thermal resistance fluid-filled pipe [K.m/W]
$U_{wall}$
OHTC pipe wall [W/(K.m$^2$)]