PURPOSE: To enable to obtain a proper heat accumulating capacity meeting with the hot water feeding load, by disposing two auxiliary heat sources at different heights at an upper section of a heat accumulating tank, the lower end portion of which is connected to a solar heat collector.
CONSTITUTION: The lower end section of a heat accumulating tank 1 is formed into a low-temperature tank 6 by connecting the lower end portion of the tank 1 to a solar heat collector via pipes 4, 5, while a high-temperature tank 3 is formed by providing auxiliary heat sources 2a, 2b at an upper section of the tank 1 located above the low-temperature tank 6. Further, an upper high-temperature tank 3a and a lower high-temperature tank 3b are formed by disposing the two auxiliary heat sources 2a, 2b at different heights. Here, arrangement is such that the capacity of the upper high-temperature tank 3a is equal to the sum of the capacity of the lower high-temperature tank 3b and that of the low temperature tank 6.
HIRATA KATSUMI
MIYOSHI AYATERU
