JPS6037393B

PURPOSE:To keep a heat accumulator at a constant temperature by making up for the heat gain lost due to the radiation of latent heat type medium by the heat of reaction of stored hydrogen with metal or alloy which is formed by dehydrogenation and possible to be hydrogenized and reducing the temperature variation of the latent heat type medium. CONSTITUTION:In heat accumulation, when a thermal medium such as hot water which has accumulated heat outside a heat accumulating tank is flowed in a pipe 8, the hot water exchanges heat with the latent heat type medium 9 in the heat accumulator 1, and at the same time, heats the hydrogenized metal or alloy in a pipe 7 and performs dehydrogenation, and the hydrogen produced in stored in a hydrogen storing part 2. At night, when the temperature outside the heat accumulating tank lowers, and heat radiation is performed through a heat insulating material 10, and the temperature in the heat accumulating tank lowers, hedydrogen gas is supplied into the pipe 7 which stores metal possible to be hydrogenized from the hydrogen storing part 2 described above and exothermic reaction is performed and the thermal insulation of latent heat type medium 9 is schemed. Thus, hot water always at a fixed temperature can be obtained from the pipe 8.