(19)
(11) EP 0 030 072 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.12.1981 Bulletin 1981/50

(43) Date of publication A2:
10.06.1981 Bulletin 1981/23

(21) Application number: 80303431

(22) Date of filing: 29.09.1980
(84) Designated Contracting States:
DE FR GB IT

(30) Priority: 30.11.1979 JP 15607079

(71) Applicant: NIPPONDENSO CO., LTD.
 ()

(72) Inventor:
  • Kanda, Naonori
     ()

   


(54) Heat exchangers and methods of fabricating heat exchangers


(57) In a heat exchanger including a flat tube (3) made of metal, and corrugated fins (5) joined by welding to the tube (3), a multiplicity of projections (3A) are successively formed on one side of the flat tube (3) and arranged in a direction intersecting the axis of the tube (3). The projections (3A), which may be triangular, arcuate, trapezoidal or any other suitable shape in cross section, each extend by a distance less than the thickness of a wall of the tube (3).






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