| 摘要 |
PURPOSE:To prevent to cool hot-water in a hot-water tank by a method wherein the solenoid opening and closing valve is provided in a water flowing part to preclude the reverse flow of water, whose temperature is reduced, into the hot- water tank. CONSTITUTION:In the evening, the water, whose temperature is reduced, tends to flow reversely into the hot-water tank through the water flowing pipe 3. However, light from the direction of the sun is shielded by a black plate 17 in a solar battery 16 and a solenoid coil 15 can not lift up a cylinder 13, therefore, a valve 11 descends and is put on the upper side of an annular plate 10 and the hole of the annular plate 10 is closed. Accordingly, the reverse flow of the water, whose temperature is reduced, into the hot-water tank 1 is precluded and the temperature of the hot-water in the hot-water tank is kept unchanged. |
