Temperature rise by solar radiation

Symbol
$\Delta \theta_{sun}$
Unit
K
Formulae
$\sigma_{sun} D_o H_{sun} T_{4iii}$in air
$0.037H_{sun}-26.3$in air-filled trough
$28.751e^{-9.8d_t}$in channel (Heinhold)
$\frac{0.29H_{sun}}{{V_{air}}^{0.89} {L_{cm}}^{0.07} W_{sum}}$in filled trough
Used in