Wavy Fin Structure and Flat Tube Heat Exchanger Having the Same

Abstract

Disclosed are a wavy fin structure, in which a cross-cut having a designated length is formed at a designated position of a wavy fin, and a flat tube heat exchanger having the same. The cross-cut is formed around at least one valley or peak of the fin. One cross-cut is formed at a valley or a peak at the central portion of the fin or a plurality of cross-cuts is formed at designated periods in the length direction of the fin. Further, the cross-cut is formed at a position at the rear of the peak and the length of the cross-cuts is 1 5  C   to   4 5  C . The wavy fin structure generates flow disturbance due to a wavy-type dynamic flow, thus improving heat transfer performance.

What is claimed is: 
     
         1 . A wavy fin structure in which fins are periodically arranged in a plurality of rows and each fin is periodically waved to form repeated valleys and peaks in the length direction of the fin,
 wherein a cross-cut having a designated length is formed around at least one valley or peak of the fin.   
     
     
         2 . The wavy fin structure according to  claim 1 , wherein the cross-cut is formed at a valley or a peak of the central portion of the fin in the length direction of the fin. 
     
     
         3 . The wavy fin structure according to  claim 2 , wherein the cross-cut is formed at a position at the rear of the peak. 
     
     
         4 . The wavy fin structure according to  claim 3 , wherein the length of the cross-cut is 
       
         
           
             
               
                 
                   1 
                   5 
                 
                  
                 C 
                  
                 
                     
                 
                  
                 to 
                  
                 
                     
                 
                  
                 
                   4 
                   5 
                 
                  
                 C 
               
               , 
             
           
         
         wherein C is 
       
       
         
           
             
               
                 b 
                 
                   2 
                    
                   
                       
                   
                    
                   
                     sin 
                      
                     
                       ( 
                       α 
                       ) 
                     
                   
                 
               
               , 
             
           
         
       
       α is a warpage angle of the fin, and b is a fin pitch. 
     
     
         5 . The wavy fin structure according to  claim 1 , wherein a plurality of cross-cuts is formed at designated periods in the length direction of the fin. 
     
     
         6 . The wavy fin structure according to  claim 5 , wherein the cross-cuts are formed at positions at the rear of peaks. 
     
     
         7 . The wavy fin structure according to  claim 6 , wherein the length of the cross-cuts is 
       
         
           
             
               
                 
                   1 
                   5 
                 
                  
                 C 
                  
                 
                     
                 
                  
                 to 
                  
                 
                     
                 
                  
                 
                   4 
                   5 
                 
                  
                 C 
               
               , 
             
           
         
       
       wherein C is 
       
         
           
             
               
                 b 
                 
                   2 
                    
                   
                       
                   
                    
                   
                     sin 
                      
                     
                       ( 
                       α 
                       ) 
                     
                   
                 
               
               , 
             
           
         
       
       α is a warpage angle of the fin, and b is a fin pitch. 
     
     
         8 . The wavy fin structure according to  claim 1 , wherein the wall of the fin connecting the valleys and the peaks has a planar surface structure. 
     
     
         9 . A flat tube heat exchanger having the wavy fin structure according to  claim 1 . 
     
     
         10 . A flat tube heat exchanger having the wavy fin structure according to  claim 2 .