| 摘要 |
Air conditioning apparatus comprises fans 24, 31 and ducts 13, 33 containing flap valves 81, 83. It will provide required indoor air pressure, such as maintaining a positive pressure for preventing dust from entering the room, or cyclically modulating the pressure in specific modes for achieving special atmospheric effects, such as raising peoples spirits or expelling insects (figs 2, 3, not shown). The variation rate of indoor pressure relative to outdoor pressure (fig 5. not shown) monitors the airtight condition of the room. A warning signal is triggered when an abnormal airtight condition occurs, so as to minimize unnecessary air-exchange, save energy consumption and increase efficiency for air filtering and air conditioning. <IMAGE> |
