Selective Surface Technology

• Selective surface collectors are manufactured by using aluminium, copper or steel. In order to create a selective surface, technologies of leaping in a magnetic field, physical steam gathering and electro-chemical gathering are used.
• The least used material in the selective surface production is steel. It is very expensive and especially within the systems in which various metals are used, its resistance against corrosion is very weak. Because of the specific gravity of the material, the steel collectors are significantly heavier when compared to other types. The installation is rather difficult and because of this, it is not preferred much.
• Copper is the most commonly used material within the selective surface market. Most important reason of this is the availability of plates that are worked into selective surfaces as a by-product for every collector manufacturer company. Mostly, the absorption values of the surfaces that are manufactured by coating the titanium material over copper under high vacuum force are around 95 % and their emission values are between 5 % and 8 %. Its resistance against corrosion is high. The thickness of the plates and coating, are significantly low.
• Production of aluminium selective surface requires special technology. The specific gravity of the material is much less than copper and steel. Coating depth is higher when compared to copper. The resistance of the surface against atmosphere conditions, even under high temperatures is much better. It can also be manufactured by using galvano technique which is rather cheaper. Absorption value is 95 % and emission value changes between 15 % and 18 %.
• Solartek solar collectors with aluminium selective surfaces are being manufactured at FENİŞ industrial facilities. The profiles that are acquired by extrusion technique are gathered together by using weld less assembling technique and developed into absorber surfaces. After that, by coating with nickel pigmented aluminium oxide in the chemical pools, selective surface is manufactured. As the first and the only domestic manufacturer of collectors by using its own manufactured selective surfaces, FENİŞ is one of five manufacturers in Europe that has its own aluminium selective surface manufacturing facilities.