Cableizer ®

Thermal resistance convection conductor—enclosure

Convection thermal resistance from conductor surface to inner wall of the PAC/GIL enclosure.

Symbol
$T_{conv,ce}$
Unit
K.m/W
Formulas
$\frac{\Delta \theta_{gas}}{W_{conv,ce}}$Vermeer1983 / Itaka1978 / Eteiba2002
$\frac{1}{\frac{0.36\pi \left(\beta_{gas} g\right)^{0.25} \left(\frac{D_{comp}-D_{c}}{2}\right)^{0.75} \left(\frac{c_{p,gas} \rho_{gas} k_{gas}}{\eta_{gas}} \Delta \theta_{gas}\right)^{0.25}}{\ln\left(\frac{D_{comp}}{D_{c}}\right)}}$Haubrich1973
Related
$\beta_{gas}$
Volumetric thermal expansion coefficient gas [1/K]
$c_{p,gas}$
Specific heat capacity gas, constant pressure [J/(kg.K)]
$D_{c}$
Diameter conductor (outer) [m]
$D_{comp}$
Diameter compartment [m]
$\Delta \theta_{gas}$
Temperature difference conductor—enclosure [°C]
$\eta_{gas}$
Dynamic viscosity gas [Pa.s]
$g$
Standard acceleration of gravity [m/s$^2$]
$k_{gas}$
Thermal conductivity gas [W/(m.K)]
$\pi$
Archimedes' constant $\pi$
$\rho_{gas}$
Density gas [kg/m$^3$]
$W_{conv,ce}$
Convective heat transfer conductor→enclosure [W/m]