| 摘要 |
PURPOSE:To suppress generation of energy loss at the time of switching cooling to heating in an air conditioner for cooling or heating by supplying to switch chilled and warm water to a heat exchanger. CONSTITUTION:At the time of switching heating to cooling, a time of opening a chilled water drain valve 16 and closing a warm water drain valve 10 is delayed from a time of opening a chilled water feed valve 13 and closing a warm water feed valve 7. Warm water retained in a heat exchanger 3 at the time of switching is circulated to a heater 1 via the valve 10 during a period until the valve 10 is closed. Accordingly, mixing of warm water within a cooler 2 can be prevented. |
