| 摘要 |
An air heat exchanger having both heat-exchanging and air-cleaning functions comprises a set of tubular casings (14) which are accommodated in a housing and extend between inlets and outlets of outer boundary walls (3, 4) thereof. In the casing (14) there is arranged at least one air filter (10) of the type comprising an air-permeable tube whose one end is closed and whose opposite end is open. On the outside of the filter tube (10) there is arranged a jacket (24) having an open end (24') and a closed end (24'') and having considerably lower air permeability than the filter tube. The open end (24') of the jacket (24) is axially spaced from the open end of the filter tube (10), the jacket serving to force filtered air having permeated the tube wall (10) from inside and outwards to be conducted back in the direction of the open end of the filter tube, before passing, during heat exchange, a gap (15) between the casing (14) and the filter tube. |
