| 摘要 |
PURPOSE:To prevent a temperature from rising unusually at the unused time without deteriorating heat collecting efficiency of a solar heat collector, by enabling communication of air of an air layer to the atmosphere through an openable valve at the time of overrising of a temperature of a heat collecting plate. CONSTITUTION:A coil 13 made of a shape memorizing alloy (for example, Cu-Zn-Al alloy) maintains an elongating state up to a certain temperature (this temperature is regarded as 0 deg.) and maintains a contraction state when a temperature exceeds 0 deg.. Under conventional use of a solar heat collector, neigher a temperature of a heat collecting plate 1 nor a temperature, that is, of an air layer 15 increases excessively, the coil 13 made of the shape memorizing alloy is in a elongating state and seals up a container 5 tightly by pressing an openable valve 12 against the container 5. During the unused time, however, of the solar heat collector, the temperature of the heat collecting plate 1 beings to rise, and the temperature of the air layer 15 is raised in proportion to the rise of the temperature of the heat collecting plate. Then, when a gap is provided in the container 5, a convection is generated within the air layer 15, a radiation quantity of heat from the heat collecting plate 1 is increased and a temperature rise of the heat collecting plate 1 is controlled. |
