GLASS TUBE WITH ANTIREFLECTIVE LAYER WITH A NANOSIZED PATTERN, METHOD FOR MANUFACTURING THE GLASS TUBE, HEAT RECEIVER TUBE WITH THE GLASS TUBE AND SOLAR COLLECTOR SYSTEM WITH THE HEAT RECEIVER TUBE

摘要

The invention relates to a glass tube with a glass tube surface. The glass tube surface is at least partly covered by an anti-reflective layer (anti-reflective coating) for reducing a reflectivity for sunlight radiation of the glass tube surface in comparison to an uncovered glass tube surface. The anti-reflective layer comprises at least one nano-pattern with a plurality of regularly arranged nano-sized structure elements. The nano-sized structure elements comprise at least one nano-size which is selected form the range between 50 nm to 500 nm. A distance between two neighboring nano-sized structure elements is selected from the range between 100 nm and 500 nm. The distance refers to the distance between centers of the neighboring nano-sized structure elements. The neighboring nano-sized structure elements are spaced from each other. The method for manufacturing the glass tube with following steps is provided: a) Providing a glass tube with an uncovered glass tube surface; b) Coating the glass tube with an imprintable/embossable composition, c) Imprinting/Embossing the nano-sized structure elements into the imprintable/ embossable composition onto the glass tube surface such that the nano-pattern of the anti-reflective layer is formed. The invention allows the transmission enhancement of glass tubes used in thermo-solar trough applications using an antireflective coating produced by hot embossing/molding and UV nano-imprint.