A direct accumulation tank, defining a closed volume (2), comprising an inlet (3) for filling the tank with a fluid, and an outlet (4) for emptying the tank of the fluid, and exhibiting an upper surface (Ia) exposed to solar rays. The upper surface (Ia) exhibits a plurality of reliefs (5, . . . 5n) for...http://www.google.com/patents/US8161964?utm_source=gb-gplus-sharePatent US8161964 - Direct accumulation tank for heating water with solar energy
