| 摘要 |
PURPOSE:To provide a roofing material which has a high solar heat collecting efficiency, by a method wherein a porous layer, made of a heat absorbing member, is formed on a corrosion resistant metal sheet, and water is flowed through the porous layer. CONSTITUTION:A radiation absorbing member 2, made of a metal or ceramic being blacking-processed as required, is adhered to a main part 1, made of a corrosion resistant metal, such as stainless, to form a porous layer. A clear film 3 is adhered to the upper surface of the porous layer, to provide a water inlet port 2a of the porous layer at one end and an outlet port 2b at the other. Coupling parts 1a and 1b are formed at the opposite ends of the main part 1, and a water flow path 1c is formed in one coupling part 1a. |
