| 摘要 |
PURPOSE:To miniaturize a hot water storage tank by a method wherein the hot water heated in the hot water storage tank is supplied successively in a bathtub in installments so as to use the bathtub as a heat storage tank. CONSTITUTION:When a heat pump unit 2 is put into running, the highly pressurized refrigerant by being compressed by a compressor 21 is liquefied at a heat exchanger 22 housed at the bottom in a hot water storage tank 1 and at that time its heat of condensation is given to the surrounding water in order to raise the water temperature. When the temperature of hot water in the upper portion of the hot water storage tank 1 reaches the predetermined primary temperature such as 45 deg.C as the result of temperature rise as mentioned above, the temperature is detected by a temperature sensor 70, which changes over a switching valve 52 to a hot water delivery circuit 71 side and at the same time puts a circulating pump 51 into actuation. As a result, the hot water in the upper portion of the hot water storage tank 1 is delivered through the switching valve 52 and a mixing valve 72 from a faucet 73 into a bathtub 61. In such a manner as just mentioned above, the water heated in the hot water storage tank 1 is successively supplied in the bathtub 61 until the amount of the hot water in the bathtub 61 reaches the predetermined amount. After that, the hot water in the upper portion of the hot water storage tank 1 is raised its temperature for heat storage further high up to a temperature such as 75-80 deg.C for the usage of another hot water supply or shower. |
