Cooling system for a vehicle

1. A cooling system for a vehicle, comprising:

a heat exchanger in which a condenser ( 200 ) comprising a plurality of tubes ( 112 , 220 ) which are parallely disposed in an air blow direction so as to be apart from each other at regular intervals; a pair of tanks ( 210 ) which are disposed at both sides of the plurality of tubes ( 112 , 220 ) and respectively divided by a baffle ( 240 ) into two independent spaces through which refrigerant and oil are respectively flowed; and fins ( 113 , 230 ) which are interposed between the tubes ( 112 , 220 ) so as to increase a heat transfer surface area to air which passes between the tubes ( 112 , 220 ), and in which a condenser ( 200 ) comprised of portions ( 210 B, 220 , 230 ) through which the refrigerant is flowed is integrally formed with a first oil cooler ( 110 ) comprised of portions ( 210 A, 112 , 113 ) through which the oil is flowed;

a radiator ( 300 ) which comprises a plurality of radiator tubes ( 320 ) which are parallely disposed in an air blow direction so as to be apart from each other at regular intervals; a pair of radiator tanks ( 310 ) which are disposed at both sides of the plurality of radiator tubes ( 320 ) and through which cooling water is flowed; and radiator fins ( 330 ) which are interposed between the radiator tubes ( 320 ) so as to increase the heat transfer surface area to air which passes between the radiator tubes ( 320 ), and which is positioned at a down stream of the condenser ( 200 ) in the air blow direction; and

a second oil cooler ( 120 ) which is provided in one of the radiator tanks ( 310 ) of the radiator ( 300 ),

wherein, when a multiplication of a hydraulic diameter (D hc ) of the condenser ( 200 ) and a hydraulic diameter (D ho ) of the oil cooler ( 110 ) is in an extent of 0.4 mm 2 ≦(D ho ×D hc )≦0.8 mm 2 , the second oil cooler ( 120 ) is a hollow pipe type oil cooler ( 120 A) formed into a single pipe.

2. The cooling system according to claim 1 , wherein the multiplication of the hydraulic diameter (D hc ) of the condenser ( 200 ) and the hydraulic diameter (D ho ) of the oil cooler ( 110 ) is in an extent of 0.5 mm 2 ≦(D ho ×D hc )≦0.8 mm 2 .

3. The cooling system according to claim 1 , wherein a pressure drop dP oil in the hollow pipe type oil cooler ( 120 A) is in an extent of 5˜14% of a pressure drop dP oil in the first oil cooler ( 110 ).

4. A cooling system for a vehicle, comprising:

a heat exchanger in which a condenser ( 200 ) comprising a plurality of tubes ( 112 , 220 ) which are parallely disposed in an air blow direction so as to be apart from each other at regular intervals; a pair of tanks ( 210 ) which are disposed at both sides of the plurality of tubes ( 112 , 220 ) and respectively divided by a baffle ( 240 ) into two independent spaces through which refrigerant and oil are respectively flowed; and fins ( 113 , 230 ) which are interposed between the tubes ( 112 , 220 ) so as to increase a heat transfer surface area to air which passes between the tubes ( 112 , 220 ), and in which a condenser ( 200 ) comprised of portions ( 210 B, 220 , 230 ) through which the refrigerant is flowed is integrally formed with a first oil cooler ( 110 ) comprised of portions ( 210 A, 112 , 113 ) through which the oil is flowed;

a radiator ( 300 ) which comprises a plurality of radiator tubes ( 320 ) which are parallely disposed in an air blow direction so as to be apart from each other at regular intervals; a pair of radiator tanks ( 310 ) which are disposed at both sides of the plurality of radiator tubes ( 320 ) and through which cooling water is flowed; and radiator fins ( 330 ) which are interposed between the radiator tubes ( 320 ) so as to increase the heat transfer surface area to air which passes between the radiator tubes ( 320 ), and which is positioned at a down stream of the condenser ( 200 ) in the air blow direction; and

a second oil cooler ( 120 ) which is provided in one of the radiator tanks ( 310 ) of the radiator ( 300 ),

wherein, when a multiplication of a hydraulic diameter (D hc ) of the condenser ( 200 ) and a hydraulic diameter (D ho ) of the oil cooler ( 110 ) is in an extent of 3.0 mm 2 ≦(D ho ×D hc )≦4.5 mm 2 , the second oil cooler ( 120 ) is a double pipe type oil cooler ( 120 B) which is comprised of external pipe ( 120 B 1 ) and an internal pipe ( 120 B 2 ) to be disposed coaxially and an internal fin ( 120 B 3 ) interposed between the external pipe ( 120 B 1 ) and the internal pipe ( 120 B 2 ).

5. The cooling system according to claim 1 , wherein the multiplication of the hydraulic diameter (D hc ) of the condenser ( 200 ) and the hydraulic diameter (D ho ) of the oil cooler ( 110 ) is in an extent of 3.2 mm 2 ≦(D ho ×D hc )≦4.2 mm 2 .

6. The cooling system according to claim 1 , wherein a temperature difference dT in the double pipe type oil cooler ( 120 B) is in an extent of 140˜170% of a temperature difference dT in the first oil cooler ( 110 ).