| 摘要 |
PURPOSE:To circulate high-temperature water when a thermal load is large and comparatively low-temperature water when the thermal load is small by a method wherein a temperature sensor is provided at slightly upstream of the outlet port of hot-water heating path of heat exchanger and the supplying amount of fuel is controlled continuously by the signal of the sensor. CONSTITUTION:Circulating water is sent by a pump 1 to a heating radiator 4 or a bathtub water heater 5 through the heat exchanger 2 and a sending pipe 3, thereafter, is returned to the pump 1 again through a return pipe 6. The temperature sensor 7 is provided at slightly upstream side of the outlet of hot-water path of the heat exchanger 2 to detect the hot-water temperature passing through the sensor. A gas amount control device 8 controls continuously the amount of gas burnt in a burner 9 by receiving the signal of temperature detected so that the hot-water temperature becomes a set temperature by a burner 9. The thermal load is (hot-water temperature at the outlet of heat exchanger-the hot-water temperature of returning section) X amount of circulating hot-water, therefore, the temperature of the hot-water sent into the room heating radiator 4 or the like is reduced in case the thermal load is smaller compared with the case in which the thermal load is larger. Accordingly, high-temperature hot-water may be obtained easily when the thermal load is large and the low-temperature hot-water may be obtained when the thermal load is small. |
