| 摘要 |
PURPOSE:To perform a ventilation work without decreasing a heating effect of an indoor area by a method wherein indoor air is heated by a heater and a part of the heated air is circulated in the indoor area and the remaining air is heat exchanged with outdoor air at a heat exchanger and then the air is discharged. CONSTITUTION:Air sucked from an indoor suction port 4 is partly heated by a heater 8 and returned back to a room A through an indoor discharging port A3. The remaining air passes through a heat exchanger 7 and discharged to outside the room C through the heat exchanger 7. The air returned back to the room A is again sucked into a blower 2, a part of the air is heated by the heater 8 and recirculated to the room and the remaining air is increased in its temperature higher than that in the case of previous passing and then discharged. In turn, the room A shows a negative pressure due to a discharging of the partial air to outside the room C, the air outside the room C is sucked from the outdoor suction port 6, passes through the heat exchanger 7 and then discharged into the room A through the indoor discharging port 11. At this time, the heat exchanging operation is performed between it and discharging air and the discharging heat is recovered to the room A. |
