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Thermal resistivity backfill

Thermal resistivity of backfill material.

The thermal resistivity of the backfill is only relevant for the cables within this backfill area. The heat flow of cables outside of a backfill area is not influenced by the backfill, which also applies for cables in another backfill area.

Symbol
$\rho_b$
Unit
K.m/W
Used in
$R_{q11}$
Thermal resistance 11 of multi-layer backfill [K.m/W]
$R_{q21}$
Thermal resistance 21 of multi-layer backfill [K.m/W]
$R_{q31}$
Thermal resistance 31 of multi-layer backfill [K.m/W]
$T_{4d}$
Thermal resistance for daily load cycle [K.m/W]
$T_{4db}$
Correction of thermal resistance for backfill [K.m/W]
$T_{4w}$
Thermal resistance for weekly load cycle [K.m/W]