Heat exchanger for a vehicle

Abstract

A heat exchanger for a vehicle engine includes a pair of tanks for supplying a coolant through a thermostat for adjusting opening/shutting depending on the temperature of the coolant and a water pump, and discharging the cooled coolant to an engine side; a header at one side coupled with the tank at one side, to which the coolant is supplied; heat exchange tubes which are structurally fastened to communicate with the heater at one end portion thereof, and arranged in parallel to a direction of driving wind; a header at the other side coupled with the tank at the other side, which is structurally fastened at the other end portion of the heat exchange tube to communicate therewith so as to discharge the coolant into the engine; and a core portion including fins fixedly brazed between the heat exchange tubes.

1 . A radiator for a vehicle for exchanging heat between a coolant heated by an engine and air flowed into the front of the vehicle to cool the engine, comprising:
 a pair of tanks for supplying a coolant supplied from the engine, and discharging the cooled coolant to an engine side; and   a core including a header at one side coupled with the tank at one side, to which the coolant is supplied, heat exchange tubes made from aluminum which is structurally fastened to communicate with the header at one end portion thereof, and arranged in parallel to a direction of driving wind, a header at the other side coupled with the tank at the other side, which is structurally fastened at the other end portion of the heat exchange tube to communicate therewith so as to discharge the coolant into the engine, and fins made from aluminum fixedly brazed between the heat exchange tubes;   wherein the width of the core (Td) of the radiator is in the range of 12 to 15 mm, the distance between outermost tubes of the core portion is in the range of 300 to 600 mm, the outer width of the tube (Th) is in the range of 1.70 to 1.90 mm, the material thickness of the tube (Tth) is in the range of 0.15 to 0.24 mm, the flow of the coolant flowing through the core portion is a completely developed turbulent flow region and has a Reynolds number of 2.100 or more when the composition of an antifreezing solution and water is 1:1 and the flow rate is in the range of 60 to 80L/min, and a transition from laminar flow to turbulent flow occurs at a flow rate of 40L/min or less.   
   
   
       2 . (canceled) 
   
   
       3 . The radiator as set forth in  claim 1 , wherein, when the flow rate of the coolant is in the range of 60 to 80L/min and the temperature thereof is 100° C., the pressure drop amount of the coolant at an exit side of the heat exchanger is 150 mmHg. 
   
   
       4 - 6 . (canceled) 
   
   
       7 . The radiator as set forth in  claim 1 , wherein the height of the fin (Fh) is in the range of 5.3 to 5.8 mm. 
   
   
       8 . The radiator as set forth in  claim 1 , wherein the thickness of the fin is in the range of 0.05 to 0.06 mm. 
   
   
       9 . The radiator as set forth in  claim 1 , wherein the heat exchange tube is a flat type with no dimple in an interior thereof. 
   
   
       10 . The radiator as set forth in  claim 1 , wherein the heat exchanger is a cross flow type.