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Internal diameter of fluid-filled pipe

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