Heat exchanger

Abstract

Provided is a heat exchanger having an optimal design satisfying appropriate pressure resistance and manufacturing characteristics, as well as maximizing heat transfer performance in an internal wall thickness, an outer wall thickness, and the number of holes of an extruded tube. Another embodiment of the present invention is directed to providing a heat exchanger having an optimal design formed based on a more systematic rule so as to be easily applied to tubes of various sizes.

What is claimed is: 
     
         1 . A heat exchanger comprising:
 a pair of header tanks formed in parallel and spaced apart from each other by a predetermined distance;   a plurality of tubes fixed to the pair of header tanks at both ends to form a flow channel of a refrigerant; and   a fin interposed between the tubes,   wherein the plurality of tubes are extruded tubes, and when each tube is formed such that a tube width is greater than a tube height and a flow channel in the tube is divided into a plurality of holes formed in parallel of the tube in a width direction by a plurality of inner walls extending in a height direction of the tube, the tube width, an outer wall thickness at an end portion of the tube in the width direction, a hole width, and an inner wall thickness have a size within a range in which the following formula is satisfied:
   2.5 <A/B <4  Formula 1:
 
   (Here, Tw: tube width, Tn: outer wall thickness at end portion of tube in width direction, A: hole width, B: inner wall thickness).   
     
     
         2 . The heat exchanger of  claim 1 , wherein
 an A/B value is greater than 2.5 to ensure pressure resistance, for which a burst pressure is greater than a predetermined burst pressure reference, and   the A/B value is smaller than 4 to prevent deterioration of heat transfer performance to be lower than a predetermined heat transfer performance reference.   
     
     
         3 . The heat exchanger of  claim 1 , wherein
 the tube width, the outer wall thickness at the end portion of the tube in the width direction, the hole width, and the inner wall thickness have a size within a range in which the following formula is further satisfied.
   0.07 <B <0.2 (mm)  Formula 2:
 
   (Here, Tw: tube width, Tn: outer wall thickness at end portion of tube in width direction, A: hole width, B: inner wall thickness).   
     
     
         4 . The heat exchanger of  claim 3 , wherein
 the value B is greater than 0.07 mm so that the inner wall is formed to be equal to or greater than a manufacturing limit of an extrusion process, and   the value B is smaller than 0.2 mm to ensure a pass rate of 98% or greater in mass-producing the tubes.   
     
     
         5 . The heat exchanger of  claim 3 , wherein
 the tube width, the outer wall thickness at the end portion of the tube in the width direction, the hole width, and the inner wall thickness have a size within a range in which the following formula is further satisfied:
   0.2 <Tw ( A+B )/( Tw− 2 Tn )<0.6 (mm)  Formula 3:
 
   (Here, Tw: tube width, Tn: outer wall thickness at end portion of tube in width direction, A: hole width, B: inner wall thickness).   
     
     
         6 . The heat exchanger of  claim 5 , wherein
 a value of Tw(A+B)/(Tw−2Tn) is within a range from 0.2 mm to 0.6 mm to prevent heat transfer performance from being lower than predetermined heat transfer performance.   
     
     
         7 . The heat exchanger of  claim 5 , wherein
 a plurality of louvers are formed on the fin, and   the hole width, the inner wall thickness, and a louver pitch have a size within a range in which the following formula is further satisfied:
     A+B<Lp   Formula 4:
 
   (Here, A: hole width, B: inner wall thickness, Lp: louver pitch).   
     
     
         8 . The heat exchanger of  claim 7 , wherein
 A+B is smaller than Lp so that at least one inner wall and hole set are included in one louver width range to enhance heat transfer performance.   
     
     
         9 . The heat exchanger of  claim 5 , wherein
 the inner wall thickness B has a size within a range in which the following formula is further satisfied:
   0.1 <B <0.18 (mm).  Formula 2-11:
 
   
     
     
         10 . The heat exchanger of  claim 9 , wherein
 the inner wall thickness B has a size within a range in which the following formula is further satisfied:
   0.07 <B <0.18 (mm).  Formula 2-12:
 
   
     
     
         11 . The heat exchanger of  claim 5 , wherein
 the inner wall thickness B has a size within a range in which the following formula is further satisfied:
   0.1 <B <0.15 (mm).  Formula 2-21:
 
   
     
     
         12 . The heat exchanger of  claim 11 , wherein
 the inner wall thickness B has a size within a range in which the following formula is further satisfied:
   0.07 <B <0.15 (mm).  Formula 2-22:
 
   
     
     
         13 . The heat exchanger of  claim 1 , wherein
 the plurality of tubes are formed of aluminum.