抄録
For purpose of long-term energy storing of solar heat energy, an effect of volumetric capacity and insulation coefficient of a storage tank was investigated. To increase the storage capability of cylindrical storage tank, the inside of the tank was separated cylindrically into three parts by a partition plate, such as the first part, the second part and the third part, from a central axis of the storage tank, to prevent heat flow out from inside to outside of the tank. The results of the calculations are as follows : (1) On a normal single type storage tank without partition plate (H-type), even if decrement of insulation coefficient from 0.434 W/(m^2℃) to 0 W/(m^2℃), stored energy was increased only 6%. (2) On the separated storage tank, when feed water from a storage tank to lower part of temperature of a solar collector (A-type), increment of energy gain from 5.3 % to 25.2% was obtained and when returned hot water by collecting solar heat into the same temperature's part as that of a separated part (B-type), energy gains from 33.2 to 49.7% were increased in comparison of the single storage tank with the same volumetric capacity, through a year. (3) For a cumulative stored energy, on both A- and B-types, the increment of energy gain of 15.8 〜 32.4% were obtained in maximum.
