| 摘要 |
PURPOSE:To enable to enhance heat-exchanging efficiency, by a method wherein a heat exchanger is floated up to a position in proximity to the surface of hot water in a storing tank and is brought into heat exchange with water fed into the tank, in recovering thermal energy from residual hot water contained in a bathtub or the like. CONSTITUTION:Water is poured into a hot water storing tank 2, while an appropriate quantity of hot water such as residual hot water is poured into the storing tank 1, in which the heat exchanger 3 is floated up to a position in proximity to the surface of hot water by a float 4. When the hot water temperature at the surface level is higher than the water temperature at a bottom part of the tank 2, a water-feeding pump 8 is operated to feed the water at the bottom part of the tank 2 into the heat exchanger 3, thereby bringing the water into heat exchange with hot water. In this case, since the heat exchanger 3 is located in proximity to the surface of hot water which is on the high-temperature side, heat is exchanged at the maximum efficiency. When the temperatures of hot water and water are equalized, the pump 8 is stopped to finish the heat exchange. Accordingly, even thermal energy at a relatively low level and intermittent thermal energy can be recovered efficiently. |
