COMPARATIVE EVALUATION OF THE EFFICIENCY OF SOLAR TRACKING WITH UNIAXIAL TRACKING DEVICE
Estimates of the efficiency of solar installations in the Sun tracking mode presented in the literature are often ambiguous due to non-identical comparison criteria and irradiation conditions. It is proposed to evaluate this characteristic systematically by two indicators - orientation and energy. The first is numerically equal to the current value of the cosine of the illumination angle of the receiving surface. And the second - the daily exposure of the tracking surface, attributed to the maximum value with ideal tracking of the Sun by a biaxial rotary device. Both indicators are calculated under the assumption of irradiation with three streams of solar energy in clear skies, which change during the day according to the model of the European Solar Radiation Atlas (ESRA).
Spatially temporal parameters of insolation of the tracking surface are determined for the site at latitudes of 50o and the longest day of the summer solstice. The limitations imposed by the orientation of the axis of rotation are clearly illustrated by spatial schemes of illumination of the tracking surface of 4 types of uniaxial rotary devices. They are easier to track the analytical relationship between the angular displacements of the Sun and the normal of the tracking surface to ensure maximum current illumination.
The relationships between the fluxes of solar radiation at different atmospheric states are taken into account by the Linke turbidity factor. The unit of comparison of the efficiency of uniaxial tracking is the daily exposure of the surface the biaxial tracking device, the angle of illumination of which during the day is zero. Four variants of estimation of efficiency concerning direct and full streams of solar radiation at two variants of distribution of brightness of the sky - isotropic and non-isotropic in the Hay-Davies model approximation are considered. The simulation results are presented in tabular and graphical forms.
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