Process for the production of a solar collector panel assembly and a panel assembly produced thereby

In a process for the production of a solar collector panel assembly comprising a carrier panel of heat-conductive material, to serve as solar energy absorption surface means, and a pipe arrangement of meander-like configuration which is mounted on the carrier panel in intimate contact therewith, wherein the pipe arrangement is applied to the carrier panel such that the wall portion of the pipe arrangement which in the assembled condition of the panel assembly is towards the carrier panel is brought into contact with a joining agent on the carrier panel, a filling material is introduced into the spaces defined on the carrier panel by the pipe arrangement, the intermediate assembly formed by the carrier panel, the pipe arrangement, the joining agent, and the filling material is disposed between first and second pressure plates with flat surfaces to cover the intermediate assembly, the pressure plates are urged towards each other, and heat is applied at least to the pressure plate which bears against the carrier panel, to cause the joining agent to melt thereby to form the join between the pipe arrangemment and the carrier panel, the improvement that said filling material is introduced in a thickness which is so much smaller than the height of the highest point of the cross-section of the pipe arrangement on the carrier panel above the base surface thereof that, after the joining agent has melted, said filling material bears on one side against the carrier panel and on the other side against the adjacent surface of said adjacent pressure plate.