| 摘要 |
An air handling unit 2 comprises a fresh air intake 4 at a low level supplying cooling air to a room via a plate heat exchanger 28, 30 at a higher level in the unit than the fresh air intake. A duct 22 above the fresh air intake communicates recirculated heated air from the room and feeds the recirculated air through the plate heat exchanger. At least two plate heat exchangers may be used wherein the recirculated air communicates air through the heat exchangers in series while the cooling air is communicated through the heat exchangers in parallel. The intake air enters the air handling unit through louvers 14 that block the entry of large debris, pass through filters 16 and a wetted media 20 to increase the relative humidity of the air and cool it adiabatically. Dampers 10, 12 control air intake flow direction depending on the outside temperature so that dampers 10 are closed and dampers 12 open when no adiabatic cooling is required and the fresh air flows along a bypass path 8. The recirculated air may be used to cool data, machine or process rooms without an increase in contamination usually associated with fresh air cooling. |
