Patent ID: 6209628
Filing Date: 2001-04-03
Classification: F28D,F28F

Abstract:
A heat exchanger comprising:a first core portion to carry out a heat exchange between a first fluid and an external fluid, said first core portion including a plurality of first tubes through which the first fluid flows and a first cooling fin having plural louvers disposed between each pair of adjacent first tubes; anda second core portion disposed to carry out a heat exchange between a second fluid and the external fluid, said second core portion including a plurality of second tubes through which the second fluid flows and a second cooling fin having plural louvers disposed between each pair of adjacent second tubes; whereinsaid first core portion and said second core portion are disposed in parallel with a predetermined clearance therebetween,said first cooling fin and said second cooling fin are integrated by a connecting portion, andsaid first core portion, having a first required radiation amount, defines a first ratio of the number of said louvers to a width of said first cooling fin in an external fluid flow direction, said second core portion, having a second required radiation amount, defines a second ratio of the number of said louvers to a width of said second cooling fin in the external fluid flow direction, said first required radiation amount and said first ratio being smaller than said second required radiation amount and said second ratio, respectively, wherein the number of louvers in said first core portion is decreased by 30% or more relative to the number of louvers in the second core portion.