Cableizer

Heat transfer coefficient convection cable—riser/tray

Symbol
$h_{conv,int}$
Unit
W/(K.m$^2$)
Formulas
$\frac{k_{gas} \mathrm{Nu}_{int}}{\delta_{d}}$riser: Chippendale
$\frac{k_{gas}}{\delta_{d}} 0.188{\mathrm{Ra}_{int}}^{0.322} \left(\frac{L_{d}}{\delta_{d}}\right)^{-0.238} \left(\frac{D_{di}}{D_{o}}\right)^{0.442}$riser: IEC 60287
$\frac{k_{gas} \mathrm{Nu}_{int}}{w_{t}}$tray
Related
$D_{di}$
Inner diameter duct [m]
$D_{o}$
Outer diameter [m]
$\delta_{d}$
Distance cable—duct [m]
$k_{gas}$
Thermal conductivity gas [W/(m.K)]
$L_{d}$
Length duct [m]
$\mathrm{Nu}_{int}$
Nusselt number cable—riser/tray
$\mathrm{Ra}_{int}$
Rayleigh number gas→riser/tray
$w_{t}$
Width (inner) [m]
Used in
$T_{4i}$
Thermal resistance medium in the duct [K.m/W]
$W_{conv,int}$
Convective heat transfer cable→riser/tray [W/m]