| 摘要 |
PURPOSE:To enhance the heat exchanging efficiency to improve the heat accumulating capability and hot water supply capability by providing a heat exchanger between heated water in a hot water tank and thermal medium in a floating manner in the upper side of the heated water in the hot water tank. CONSTITUTION:When the heat is accumulated, the low temperature water 11 to be heated existing in the bottom of a hot water tank 5 is sucked from the lower end of a suction pipe 36 to be supplied to the inner pipe 26 of a heat exchanger 21 which is disposed in a floating manner in the upper part, and after exchanging heat with a high temperature thermal medium which is circulated from a solar heat collector 24 into an external case 22, is poured out of the inner pipe 26 to the liquid surface side of the hot water tank 5. Under a hot water delivery mode, three-way switch valves 31, 32 are switched to allow the high temperature heated water in the upper part to be drawn into the inner pipe 26 of the heat exchanger 21 to be further raised in temperature, the heated water being supplied to a hot water supply unit 43 via a pump 34 and a thermowax valve 41, or through a proportionally controlled boiler 42 when the temperature is low. In this manner, the heat exchanging efficiency can be enhanced. |
