1215/2014 - 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 - The Trade Hub