A solar panel with dimensions of approximately 2 × 2 m, consisting of 25 glass vacuum tubes mounted in parallel and interconnected via a collector pipe. Each vacuum tube is constituted by two concentric pipes, containing heat transfer fluid. The inner pipe of each tube is coated with an absorption layer. The solar energy is absorbed by the layer on the inner pipe of the tubes and converted into heat energy. The heat is then transferred to the heat transfer fluid, which turns into gas, rises and transfers the heat to the collector pipe (a copper manifold). The heat is subsequently transferred from the collector pipe to a water storage tank by way of a tubing system containing heat transfer fluid circulating by means of a pump managed by a controller. The pump, controller, tubing system and water storage tank are not included upon presentation. The solar panel is used in solar water heating systems and is intended to be mounted on the roof.
[1][1]. https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32014R12...