Heat exchanger having several heat exchanging portions

Claim 2

A heat exchanger (1) according to claim 1, wherein the number of louvers (220, 320) in one core potion having a smaller required radiation amount than that in the other core portion is less than 30% of the number of louvers in the other core portion.

Claim 3

A heat exchanger (1) according to claim 1, wherein a louver pitch in one core portion having a smaller required radiation amount than that in the other core portion is larger than a louver pitch in the other core portion.

Claim 4

A heat exchanger (1) according to claim 1, wherein said louvers (220, 320) have a first louver group (221, 321), a second louver group (222, 322), and a turning louver (223, 323) for turning the external fluid flow direction, the louvers (220, 320) in said first louver group (221, 321) and the louvers (220, 320) in said second louver group (222, 322) tilt toward an opposite side to each other, said turning louver (223, 323) is arranged between said first and second louver groups (221, 321, 222, 322), in one core portion having a smaller required radiation amount than that in the other core portion, a flat turning surface (223a, 323a) is formed in said turning louver (223, 323) and an external fluid introducing portion (224, 324) is provided at an upstream of external fluid flow side of the louvers (220, 320), and a length of said flat turning surface (223a, 323a) is longer than that of said external fluid introducing portion (224, 324).

Claim 5

A heat exchanger (1) comprising: a first core portion (2) to carry out a heat exchange between a first fluid and an external fluid, said first core portion (2) including a plurality of first tubes (21) through which the first fluid flows and a first cooling fin (22) having plural louvers (220) disposed between said each pair of adjacent first tubes (21); and a second core portion (3) disposed to carry out a heat exchange between a second fluid and the external fluid, said second core portion (3) including a plurality of second tubes (31) through which the second fluid flows and a second cooling fin (32) having plural louvers (320) disposed between said each pair of adjacent second tubes (31); wherein said first core portion (2) and said second core portion (3) are disposed in parallel with a predetermined clearance (46) therebetween, said first cooling fin (22) and said second cooling fin (32) are integrated by a connecting portion (45), in one core portion, out of said first and second core portions (2, 3), a required radiation amount of which is smaller than that of the other core portion, a width of said cooling fin in an external fluid flow direction is shorter than a width of said tube in its cross sectionally longitudinal direction, and a ratio (Nc/Ltc), in said first core portion (2), of the number (Nc) of said louvers (220) to the width (Ltc) of said first tube (21), and a ratio (Nr/Ltr), in said second core portion (3), of the number (Nr) of said louvers (320) to the width (Ltr) of said second tube (31) satisfy that the ratio in one core portion, out of said first and second core portions 2, 3), a required radiation amount of which is smaller than that of the other core portion is smaller than the ratio in the other core portion.

Claim 6

A heat exchanger (1) according to claim 5, wherein a width of said cooling fin in an external fluid flow direction in one core portion having smaller required radiation amount than that in the other core portion is less than 80% of the width of said tube in the other core portion.

Claim 7

A heat exchanger (1) comprising: a first core portion (2) to carry out a heat exchange between a first fluid and an external fluid, said first core portion (2) including a plurality of first tubes (21) through which the first fluid flows and a first cooling fin (22) having plural louvers (220) disposed between said each pair of adjacent first tubes (21); and a second core portion (3) disposed to carry out a heat exchange between a second fluid and the external fluid, said second core portion (3) including a plurality of second tubes (31) through which the second fluid flows and a second cooling fin (32) having plural louvers (320) disposed between said each pair of adjacent second tubes (31); wherein said first core portion (2) and said second core portion (3) are disposed in parallel with a predetermined clearance (46) therebetween, said first cooling fin (22) and said second cooling fin (23) are integrated by a connecting portion (45), and a length of said louver in one core portion, out of said first and second core portions, a required radiation amount of which is smaller than that of the other core portion is shorter than a length of said louver in the other core portion.

Claim 8

A heat exchanger (1) according to claim 7, wherein the length of said louver in one core portion having a smaller required radiation amount than that in the other core portion is less than 50% of the length of said louver in the other core portion.

Claim 9

A heat exchanger (1) comprising: a first core portion (2) to carry out a heat exchange between a first fluid and an external fluid, said first core portion (2) including a plurality of first tubes (21) through which the first fluid flows and a first cooling fin (22) having plural louvers (220) disposed between said each pair of adjacent first tubes (21); and a second core portion (3) disposed to carry out a heat exchange between a second fluid and the external fluid, said second core portion (3) including a plurality of second tubes (31) through which the second fluid flows and a second cooling fin (32) having plural louvers (320) disposed between said each pair of adjacent second tubes (31); wherein said first core portion (2) and said second core portion (3) are disposed in parallel with a predetermined clearance (46) therebetween, said first cooling fin (22) and said second cooling fin (32) are integrated by a connecting portion (45), and a tilt angle of said louver in one core portion, out of said first and second core portions, a required radiation amount of which is smaller than that of the other core portion is smaller than a tilt angle of said louver in the other core portion.

Claim 10

A heat exchanger (1) according to claim 9, wherein the tilt angle of said louver in one core portion having a smaller required radiation amount than that in the other core portion is less than 80% of the tilt angle of said louver in the other core portion.

Claim 11

A heat exchanger (1) according to claim 1, wherein said first core portion (2) is a condenser core portion (2) for condensing a refrigerant of a condenser for forming a refrigeration cycle, said second core portion (3) is a radiator core portion (3) for cooling an engine coolant of an automotive engine, said external fluid is cooling air for condensing the refrigerant and cooling the engine coolant, and said condenser core portion (2) is disposed at an air upstream side of said radiator core portion (3).