HEAT STORAGE SYSTEM

PROBLEM TO BE SOLVED: To achieve improvement of a heat storage amount and simplification of a structure.SOLUTION: A heat storage tank 2 is configured by including an inner tank 4 and an outer tank 5 partitioned by a partition wall 3 with a heater 20 for partitioning. In the inner tank 4, a heat storage material 6 for phase change which goes through a phase change within a heat storage temperature range and in which density of a solid phase is larger than that of a liquid phase is charged. At an upper position of the inner tank 4, a heat transfer pipe 16 for heat take-out is arranged by being submerged in the heat storage material 6 for phase change. A solid heat storage material 7 is charged in the outer tank 5. A heat storage system 1 is formed by providing a hot plate 10 for heating the inner tank 4 for heat storage and each of the heat storage materials 6, 7 in the outer tank 5 at a lower end part of the heat storage tank 2. In the heat storage tank 2, a heat storage amount per unit volume of the heat storage tank 2 is improved by performing heat storage by utilizing latent heat when the heat storage material 6 for phase change in the inner tank 4 goes through solid-liquid phase change and the solid heat storage material 7 in the outer tank 5. It is not necessary that the heat transfer pipe 16 for heat take-out and the hot plate 10 are distributed to the entire heat storage tank 2. 【課題】 蓄熱量の向上と、構造の簡略化を図る。【解決手段】 蓄熱槽２は、隔壁用ヒータ２０付きの隔壁３により仕切られた内槽４と外槽５を備えた構成とする。内槽４には、蓄熱温度範囲で相変化し、固相の密度が液相よりも大きい相変化用蓄熱材６を充填する。内槽４の上部位置には、熱取出用の伝熱管１６を、相変化用蓄熱材６に没する配置で設ける。外槽５には、固体蓄熱材７を充填する。蓄熱槽２の下端部には、蓄熱のため内槽４と外槽５内の各蓄熱材６，７を加熱するホットプレート１０を設けて蓄熱システム１を形成する。蓄熱槽２では、内槽４内の相変化用蓄熱材６が固液の相変化する際の潜熱と、外槽５内の固体蓄熱材７を利用した蓄熱を行うことで、蓄熱槽２の単位体積当たりの蓄熱量を向上させる。熱取出用の伝熱管１６とホットプレート１０は、蓄熱槽２内の全体に分布させる必要はない。【選択図】図１