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Parameter $\phi$ for trough

Symbol
$\phi_{tr}$
Formulae
$2.13\left(\frac{t_t}{h_t}+0.05\right)^{-0.39} \left(\frac{w_t}{h_t}\right)^{0.065}$
Related
$h_t$
Inner height [m]
$t_t$
Wall thickness [m]
$w_t$
Inner width [m]
Used in
$T_{tr}$
Thermal resistance of trough [K.m/W]