| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a compact and low-cost water heat exchanger in which water heat exchangers for hot water supply and for heating are integrated.SOLUTION: A water heat exchanger 10 is accommodated in an outer pipe 15 in a state where refrigerant fine pipes 131, 132, 133 are wound around an inner pipe 11, so that water heat exchangers for hot water supply and for circulation water for heating are integrated, and also a refrigerant passage switching valve can be eliminated which is necessary when the water heat exchangers for hot water supply and for circulation water for heating are mounted separately. As a result, the compact and low-cost water heat exchanger 10 can be provided. Also, as the water flowing in a gap space between the inner pipe 11 and the outer pipe 15 is the circulation water for heating and not the water for hot water supply, even when flux at the time of brazing between the inner pipe 11 and the refrigerant fine pipes 131, 132, 133 is mixed into the circulation water for heating, it has no sanitation problem.</p> |
