Collector, with black anodising surface, for solar cell - with high sunlight absorption, high heat transition coefficient and high durability

摘要

The collector element consists of Al which is black anodised on the surface facing the sun, pref. in matt black, with an anodised layer =20 mu thick. The part of the collector element to be anodised may first be picked in alkali, to obtain a matt surface and prevent any effect on heat absorption by reflection. The result is a combination of high absorption capacity for solar radiation, high heat transition coefft., and sufficient durability even at high temps. Misting up of glass panes placed on top of the collector element by dust particles from the inside cannot occur. The thickness of the anodised layer is sufficient to allow high absorption while minimising losses in heat transition.