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Depth of laying

The depth of laying is defined as:

With the deep burial thermal inertia option activated, $L_{cm}$ is replaced with $L_{deep}$.

Symbol
$L_{cm}$
Unit
m
Formulae
$\frac{L_c}{1000}$
Related
$L_c$
Depth of laying of sources [mm]
$L_{deep}$
Equivalent depth for deep burial [m]
Used in
$\beta_6$
Factor $|1-\beta(6)|$
$\beta_t$
Attainment factor cable surface to ambient
$D_{dry}$
Diameter of drying zone [m]
$d_f$
Spacing from hottest object in group [m]
$d_{psc}$
Point source correction [m]
$d_t$
Channel covering [m]
$\Delta \theta_{e,t}$
Transient temperature rise of outer surface [K]
$\Delta \theta_{sun}$
Temperature rise by solar radiation [K]
$\gamma_t$
Attainment factor for groups of cables
$\mathrm{Gr}_L$
Grashof number, ground to air
$L_{deep}$
Equivalent depth for deep burial [m]
$L_{dry}$
Depth of characteristic diameter of drying zone [m]
$R_{q22}$
Thermal resistance 22 of multi-layer backfill [K.m/W]
$s_{b3}$
Thickness from object to top of bedding layer [m]
$T_e$
External thermal resistance of tunnel [K.m/W]
$T_{tr}$
Thermal resistance of trough [K.m/W]
$\tau$
Transient load period [s]
$u$
Substitution coefficient u
$u_p$
Substitution coefficient u
$\mathscr{z}_g$
Impedance of earth return in ground [$\Omega$/m]
$\mathscr{z}_{gm}$
Impedance of mutual earth return in ground [$\Omega$/m]