| 摘要 |
PROBLEM TO BE SOLVED: To permit the correct measurement of remaining amount of hot water without receiving the affection of noise and the like by a method wherein the width of renewal is limited to a predetermined value when a difference between both values is higher than the predetermined value upon renewing a stored value based on the values of flow rates of circulation, which are obtained at every times. SOLUTION: Hot water 11 in a bathtub 1 is circulated through a heat exchanger 3 by a circulating pump 4 while the inlet temperature and the outlet temperature of the circulating hot water 11 are detected by respective temperature sensor 41, 42. The flow rate of circulation is obtained based on a difference between the detecting temperatures of both temperature sensors 41, 42 under a condition that heating operation is not effected such as the time of independent operation of additional heating of bath, then, the obtained flow rate of circulation is stored in a memory means. Further, the width of renewal is limited to a predetermined value when a difference between both values is higher than a predetermined value upon renewing the stored value based on the flow rate of circulation obtained every times periodically. According to this method, the remaining amount of hot water 11 can be measured correctly without receiving any affection of noise or the like. |
