| 摘要 |
PROBLEM TO BE SOLVED: To simplify the constitution of a heat pump type hot-water supply system for bath and, at the same time, to improve the reliability of the constitution. SOLUTION: In the heat pump type hot-water supply system for bath, a first pressure reducing means 3 and an evaporator 4 which collects atmospheric heat or solar heat and a second pressure reducing means 6 and a heat recovery type heat exchanger 7 are arranged in parallel with respect to a compressor 1 and a condenser 2. In addition, an operation control means 17 which controls the hot-water supplying operation by means of a heat recovery type refrigerant circuit 8 or natural heat utilizing type refrigerant circuit 5 by blocking the first or second pressure reducing means 3 or 6 is provided. Consequently, the switching between flow passages used for hot water supplying operation utilizing atmospheric heat and for hot-water supplying operation utilizing waste heat recovered from a bathtub can be performed by means of a simple constitution composed only of the pressure reducing means 3 and 6. When the hot-water supplying operation is performed, in addition, the flow rate of the refrigerant can be controlled independently by means of the first pressure reducing means 3 at the time of utilizing the natural heat and by means of the second pressure reducing means 6 at the time of utilizing the waste heat recovered from the bathtub. Therefore, the number of used parts can be reduced and the reliability of the compressor 1, etc., can be improved. |
