(19)
(11) EP 0 866 298 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
16.06.1999 Bulletin 1999/24

(43) Date of publication A2:
23.09.1998 Bulletin 1998/39

(21) Application number: 98104696.4

(22) Date of filing: 16.03.1998
(51) International Patent Classification (IPC)6: F28D 1/04, F28F 1/12
(84) Designated Contracting States:
AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 17.03.1997 JP 63237/97

(71) Applicant: DENSO CORPORATION
Kariya-City Aichi-Pref. 448 (JP)

(72) Inventors:
  • Sugimoto, Tatsuo
    Kariya-shi, Aichi 448-8661 (JP)
  • Suzuki, Shinobu
    Kariya-shi, Aichi 448-8661 (JP)
  • Sakane, Takaaki
    Kariya-shi, Aichi 448-8661 (JP)
  • Yamanaka, Yasutoshi
    Kariya-shi, Aichi 448-8661 (JP)

(74) Representative: Klingseisen, Franz, Dipl.-Ing. et al
Patentanwälte, Dr. F. Zumstein, Dipl.-Ing. F. Klingseisen, Postfach 10 15 61
80089 München
80089 München (DE)

   


(54) Heat exchanger having several heat exchanging portions


(57) A ratio (Nc/Lc), in a condenser core portion (2), of the number (Nc) of louvers (220) to a width (Lc) of a condenser cooling fin (22), and a ratio (Nr/Lr), in a radiator core portion (3), of the number (Nr) of louvers to a width (Lr) of a radiator cooling fin (32) satisfy that the ratio in one core portion, out of the condenser and the radiator core portions, a required radiation amount of which is larger than that of the other core portion is larger than the ratio in the other core portion.
Thus, in the core portion having a small required radiation amount, the number of louvers relative to the width of the cooling fin is small thereby decreasing the heat transfer ratio. However, by this, the air flow resistance in this core portion decreases thereby increasing an air flow amount. Thus, the radiation amount of the core portion having a large required radiation amount increases.






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