| 摘要 |
PURPOSE:To make carrying power unnecessary and obtain a system utilizing solar heat, well-fitted to a building, by a method wherein a partitioning wall having heat insulating property is provided in a heat accumulating tank and openings are provided at the upper and lower parts of the partitioning wall while a valve opened and closed by a shape-memory alloy provided between the partitioning wall and a heat collecting plate is provided at the lower opening. CONSTITUTION:The temperature of a heat collecting unit 1 is reduced to a temperature near an atmospheric temperature at night, therefore, the ambient temperature of a shape-memory alloy 13 is reduced and a valve 12 is closed. When the sun starts to shin, the temperature of water near a heat collecting plate 9 rise and the specific gravity of the water is reduced whereby a flow from the lower part to the upper part of the heat collecting unit 1 is generated and the temperature near the shape-memory alloy 13 rises. When the temperature has risen to a temperature whereat the shape-memory alloy 13 is elongated, the alloy 13 pushes the valve 12 and an opening at the lower part of a partitioning wall is opened. Then, the flow, being circulated in the heat collecting unit 1, flows to a heat accumulating part 5 and solar heat is accumulated in the heat accumulating unit 5. On the other hand, the heat collecting plate 9 is cooled and cooled water flows through the heat collecting unit 1 from the upper part toward the lower part thereof when heat collection is finished to cause the shape-memory alloy 13 to contract again and the valve 12 to move, whereby the lower opening is closed by a stopper 15 and the valve 12.
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