Abstract: The channel cleaning brush comprises a flexible core (10) on which at least one brush (15) is mounted, which is formed by a shaft (20) and a cleaning coil disposed on the shaft, which comprises fins (21) regularly disposed on the shaft (20). The brushes are over-moulded on the core.

Abstract: Solar collector of the heat pipe type, comprising in per se known manner a case or container containing a heat pipe absorber of the solar energy, insulation placed between the absorber and the bottom of the container, at least one glass partition on the container, as well as the devices necessary for assembling and sealing the system, said heat pipe absorber being constituted by a tightly sealed case formed by a first heat collecting wall, a second wall forming the base and sidewalls, a capillary system lining the inside of the case and a heat transfer fluid which wets this capillary system, wherein the capillary system comprises a first part applied to the first wall and a second part applied to the second wall and wherein at least one of the said first and second walls is deformable under the action of an overpressure in the case, said first and second parts of the capillary system having no point of contact when the wall is deformed and at least one line of contact when the wall is not deformed.