Coaxial air to air heat exchanger for circumferential window frame installation

Abstract

The circumferential and coaxial heat exchanger, consisting of frame, ducts for supplied and discharged air, as well as fans, is characterized in that, it is made up of at least one internal diaphragm ( 1 ), situated coaxially with the external enclosure ( 2 ) and separating at least two tightly divided coaxial ducts ( 3 ) and ( 4 ) for the supplied and discharged air. The internal diaphragm ( 1 ), separating the air ducts ( 3 ) and ( 4 ) is made of material combining high thermal conductivity, resistance to corrosion and adequate strength parameters (preferably aluminium alloys), and the shape of its cross-section is corresponding to the to the shape of external enclosure ( 2 ).

1 . A circumferential and coaxial heat exchanger for an accommodation, comprising a frame having at least two tightly divided coaxial ducts that include a supplied air duct and a discharged air duct, and at least one fan, the frame including an external enclosure and at least one internal diaphragm situated coaxially with the external enclosure and separating the at least two tightly divided coaxial ducts. 
     
     
         2 . The circumferential and coaxial heat exchanger according to  claim 1 , wherein the shape of the cross-section of the internal diaphragm is corresponding to the shape of external enclosure. 
     
     
         3 . The circumferential and coaxial heat exchanger according to  claim 1 , further comprising at least two additional internal diaphragms, situated coaxially with the external enclosure, to provide two additional ducts, where the two additional ducts are alternately serving the air supplied to, and discharged from, the accommodation.