Serpentine heat exchanging apparatus having corrugated fin units

Claim 1

In a serpentine type heat exchanging apparatus comprising a tube device provided with a plurality of refrigerant passages therein, said tube device being bent to define a serpentine tortuous cross section having a plurality of parallel portions spaced apart from each other to form horizontal passages for air to be heat exchanged and connecting portions connecting adjacent ends of said parallel portions, and corrugated fin units folded into wavy form are interposed within each of said horizontal passages, respectively, to provide outermost end fins on each fin unit in each horizontal passage the improvement comprising each said connecting portion having a plurality of arc shaped segments alternatively connected between opposed parallel portions of said tube device at adjacent upper and lower ends of said portions including at least one outwardly facing arc segment at the center portion of said connecting portion with an inner surface of said outwardly facing arc segment being engaged with the outermost end fin of the fin unit in each said horizontal passage.