# Thermal resistance of J tubes below sea level

The radial thermal network below the sea level is comparable to the J tube air section, with the only difference being that the convection and radiation terms within the air section are replaced by a solid water domain. The thermal resistance of the water between the cable and the J tube is calculated using the standard thermal resistance equation for an annuls.

Symbol
$T_{water}$
Unit
K.m/W
Formulae
$\frac{\rho_{w} \ln{\left(\frac{Di_{D}}{D_{e}} \right)}}{2 \pi}$
Related
$D_{e}$
$\rho_{w}$
Density of water [kg/m$^3$]