| 摘要 |
<p>The invention relates to a cover element for greenhouses or the like, which includes a first rigid transparent panel (3) having a predetermined size. According to the invention, said first panel (3) has substantially transparent areas (7) alternated with substantially opaque areas (6), optical means (110) being provided for deviating and concentrating light on the opaque areas (6) when the sun (12) is at its highest position above the horizon, and for progressively deviating and concentrating light on the transparent areas (7) when the sun (12) is at its lowest position above the horizon, in such a manner as to control greenhouse heating and lighting and prevent any excessive heat changes therein. According to a preferred embodiment, the opaque areas (6) are composed of electricity generating photovoltaic modules (106).</p> |
