| 摘要 |
PROBLEM TO BE SOLVED: To correctly measure a remaining amount of bath water in a bathtub by a method wherein the flow rate of circulation in a circulating passage is detected to correct the flow rate of circulation so as to increase the remaining amount of bath water when the flow rate of circulation is small. SOLUTION: Bath water 11 in a heat exchanger 3 for heating the bath water 11 of a bathtub 1 and the bathtub 1 is circulated by a circulation pump 14 through a circulating passage 8 while the remaining amount of bath water in the bathtub 1 is obtained from the increasing speed of a bath water temperature, detected by a temperature sensor 41 provided in the circulating passage 8 so as to be positioned at the upstream side of the heat exchanger 3, and the amount of heat transmitted to the bath water 11 through the heat exchanger 3 to supplement hot-water from a hot-water filling mechanism 6 into the bathtub 1. In this case, the flow rate of circulation in the circulating passage 8 is detected to correct the remaining amount of bath water so as to be increased when the flow rate of circulation is small. According to this method, the remaining amount of bath water in the bathtub 1 can be measured correctly. |
