| 摘要 |
A ventilation apparatus comprises a box having an inlet 142 and an outlet 146 for fresh air, an inlet 150 and an outlet 154 for vitiated air, and at least two heat exchangers 102, 104 in series. Fresh air 160 is drawn in (by fan 148) through inlet 142, heat exchanger 102, heat exchanger 104 and outlet 146 to the space to be ventilated. Vitiated air 162 is drawn out (by fan 156) through inlet 150, heat exchanger 104, heat exchanger 102 and outlet 154 to atmosphere. The heat exchangers are of the aluminium plate type with corrugated spacers (Fig 2). The heat exchangers may be stacked one above the other to save space (Fig 6). |
