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Temperature rise by crossing heat sources

Temperature rise by crossing heat sources, at the hottest point along the cable.

Symbol
$\Delta \theta_{0x}$
Unit
K
Formulae
$\sum\limits_{h=1}^{k_X} T_{mh} \cdot W_h$
Related
$k_X$
Number of heat sources crossing
$T_{mh}$
Mutual thermal resistance between rated and crossing object(s) [K.m/W]
$W_h$
Heat generated by external object [W/m]
Used in
$\Delta W$
Incremental heat generated [W]
$F_{red}$
Reduction factor for the permissible current rating
$\theta_{ar}$
Temperature of armour [°C]
$\theta_{de}$
Temperature of duct outer wall [°C]
$\theta_{di}$
Temperature of duct inner wall [°C]
$\theta_{dm}$
Mean temperature of the medium in the duct [°C]
$\theta_e$
External temperature of the object [°C]
$\theta_f$
Temperature of filler for multi-core cables type SS with sheath [°C]
$\theta_s$
Temperature of screen/sheath [°C]
$\theta_{sc}$
Temperature of screen [°C]
$\theta_{sh}$
Temperature of sheath [°C]