${\tau }_0$

Concentrator transmissivity

${\alpha }_0$

Absorption coefficient of solar cell surface

$A_0$

Surface area of the solar cell (m²)

$P_{ecl}$

Power density of solar irradiance (W/m²)

C

Light concentration

$A_{ray}$

Radiative surface ( $A_{ray}=A_0$ ) (m²)

$\sigma$

Stephan-Boltzmann coefficient (5.67 × 10⁻⁸ w/m² K⁴)

$\epsilon$

Emissivity of the solar cell surface

$T_0$

Ambient temperature

$A_c=A_0$

Convective surface (m²)

h

Heat exchange coefficient

v

Air velocity (m/s)

$\dot{m}$

Air mass flow rate (kg/s)

$c_p$

Air specific heat (J·kg⁻¹·K⁻¹)