| 摘要 |
PURPOSE:To enable the temperature of hot water in a bath tub to be increased again without recirculating dusts and stains within the bath tub by a method wherein a hot water supplying pipe of a dwelling bath tub and a hot water feeding device are utilized, a hot water circulation circuit thermally insulated from the hot water in the bath tub is formed and a heat exchanger within the bath tub is installed in a circulation circuit. CONSTITUTION:Tap water is fed from a tap water pipe 13 to a hot water feeder 7 and changed into hot water, and then the hot water is supplied through a hot water feeding pipe 5 and a hot water distributing pipe 11, supplied from a hot water column 11a of a bath tub into a bath tub 3, resulting in making hot water 3a of the bath tub for storage. The hot water 3a in the bath tub shows a decreased temperature as a time elapses, its temperature becomes unappropriate temperature when a bath is actually utilized. When a hot water circulation pump 8 is operated, hot water of high temperature within the hot water feeder 7 passes through a hot water feeding pipe 5, enters into a heat exchanger 2, exchanges heat with the hot water 3a of the bath tub to heat the hot water, and passes through a hot water returning pipe 6. The water is reheated by the hot water feeder 7 through a low temperature water back-flow preventing value 10 under operation of the circulation pump 8 and then recirculated to a hot water feeding pipe 5. Since the heat exchanger 2 to be used has a scroll pipe 25, a large heat exchanging surface is formed within a low volume and then the flowing resistance of the hot water can be reduced to a low value. |
