| 摘要 |
The object of the present invention is to shorten a heat-storage time. Provided is a heat-storage apparatus capable of storing heat in a heat-storage tank housing erythritol, which has a melting point of 100.degree.C or higher, stores latent heat by melting and radiates latent heat by coagulatin g, by supplying the heat-storage tank with oil, which has a lighter specific gravity than that of erythritol, exchanges heat by directly contacting the erythritol, and is separated from the erythritol due to a difference of specific gravity, and also capable of taking out the heat stored in the heat-storage tank, in which the apparatus has a thermometer that measures a temperature of the oil to be supplied to the heat-storage tank when storing heat in the heat-storage tank or taking out heat stored in the heat-storage tank and a pump that stops supply of the erythritol when the temperature of the oil measured is outside a predetermined temperature range and controls a supply amount of the oil so as to bring a oil supply weight per unit weight of the heat storage into a predetermined range when the temperature is within the predetermined temperature range.
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