| 摘要 |
<p>PURPOSE:To heat up the water in a fixed period of time at all times by a method wherein a proper capacity of heating element is calculated based upon a hot water quantity intended to be used, the temperatures at the upper and lower parts in a hot water storage tank, the state of a remaining hot water and the like. CONSTITUTION:The heat quantity of the hot water quantity to be stored is calculated by means of an arithmetic unit A11 based upon the set value of the hot water quantity intended to be used the following day set at a hot water quantity setting unit 9 and the temperature at the lower part in the hot water storage tank detected by a lower part temperature detecting unit 10. The heat quantity of the remaining hot water is calculated by means of an arithmetic unit B14 based upon the quantity of the remaining hot water detected by a remaining hot water quantity detecting unit 12 and the temperatures at the upper and lower parts in the hot water storage tank detected by the upper and lower parts temperature detecting units 13 and 10. The required capacity of the heating element is calculated by means of an arithmetic unit C15 based upon the difference between both said heat quantitites just mentioned above. Furthermore, the energizing to the heating element is controlled by a power controlling unit 16 and the re-setting of the capacity of the heating element is performed based upon the detected values of the respective detecting units 10, 12 and 13 in such a manner as indicated with dash- lines after the elapse of a predetermined period of time since the start of energizing.</p> |
