| 摘要 |
PURPOSE:To prevent the excessive heat collecting condition of a heat medium by a method wherein a part of liquid to be heated in a heat accumulating tank is discharged and new liquid to be heated is supplemented when the temperature of the heat medium has become higher than a given value, thereafter, a heat collecting pump is operated. CONSTITUTION:A circulating circuit 8 for the heat medium is formed by connecting a heat exchanger 2 in the heat accumulating tank 9 and a heat collector 2 with a feeding pipe 6, interposed with the heat collecting pump 4, and a returning pipe 7 while a water supplying pipe 11, interposed with a pressure reducing non-return valve 10, and a water discharging pipe 13, interposed with a control valve 12, are communicated with the heat accumulating tank 9. The opening of the valve 12 and the starting and stopping of the pump 4 are controlled by a control unit 19 equipped with a return pipe senser 22, detecting the temperature of the heat medium in the pipe 7, or the like. When the detecting temperature of the senser 22 has become higher than a given value, the unit 19 opens the valve 12 to discharge a part of warm water in the heat accumulating tank 9 from the pipe 13 while the temperature of the heat accumulating tank 9 is lowered by supplying city water to the tank 9 by the pump 4 from the pipe 11 through the valve 10, and thus the heat exchanger 2 may be operated effectively. |
