| 摘要 |
PURPOSE:To efficiently absorb sunlight in a heat regenerating layer by disposing a sunlight absorber in the regenerating layer. CONSTITUTION:A planar sunlight absorber 4 is disposed in the proximity of a boundary between a heat regenerating layer 1 and a heat insulating layer 2. By this constitution, most of the sunlight passing through the heat regenerating layer 1 can be absorbed within the regenerating layer 1. When sunlight is absorbed in this manner, the temperature distribution in the regenerating layer 1 becomes such that the lower the colder. Therefore, the natural convection is prevented, and the heat loss in the form of a conduction to the bottom can be reduced. |
