Heat exchanging tube and heat exchanger

Abstract

A heat exchanging tube is provided with a flat tube main body having a predetermined length and a plurality of refrigerant passages extending in a tube longitudinal direction and arranged in a tube widthwise direction. The following relational equations (a) to (c) are satisfied: W=6 to 18 mm . . . (a); Ac/At×100=50 to 70% . . . (b) and P/L×100=350 to 450% . . . (c), where “W” is a width of the tube main body, “Ac” is a total cross-sectional area of the refrigerant passages, “At” is a total cross-sectional area of the tube main body (including the refrigerant passages), “L” is an external perimeter of the tube main body and “P” is a total inner perimeter of the refrigerant passages. With this tube, enough pressure strength can be obtained and the passage resistance can be decreased while keeping the light weight, and further the heat exchanging performance can be improved.

1 . A heat exchanging tube provided with a plurality of refrigerant passages in a flat tube main body having a predetermined length, the refrigerant passage extending in a direction of a tube longitudinal direction and being arranged in parallel in a tube widthwise direction, 
 wherein the following relational equations (a), (f), (g) and (h) are satisfied:      W=6 to 18 mm  (a),  H=0.5 to 1.5 mm  (f),  Ta=50 to 80 μm  (g) and  Tb=80 to 250 μm  (h),    where “W” is a width of the tube main body, “H” is a height of the tube main body, “Ta” is a thickness of a partitioning wall partitioning adjacent refrigerant passages in the tube main body, “Tb” is a thickness of an external peripheral wall of the tube main body.    
   
   
       2 . The heat exchanging tube as recited in  claim 1 , wherein the width W of the tube main body is set to be 6 to 14 mm.  
   
   
       3 . The heat exchanging tube as recited in  claim 1 , wherein the width W of the tube main body is set to be 7 to 12 mm.  
   
   
       4 . A heat exchanger provided with a pair of headers and a plurality of heat exchanging tubes arranged in parallel in a header length direction, opposite ends of the heat exchanging tube being connected to the headers in fluid communication, 
 wherein the heat exchanging tube is provided with a flat tube main body having a predetermined length and a plurality of refrigerant passages extending in a tube longitudinal direction and arranged in a tube widthwise direction, and    wherein the following relational equations (a), (f), (g) and (h) are satisfied:      W=6 to 18 mm  (a),  H=0.5 to 1.5 mm  (f),  Ta=50 to 80 μm  (g) and  Tb=80 to 250 μm  (h),    where “W” is a width of the tube main body, “H” is a height of the tube main body, “Ta” is a thickness of a partitioning wall partitioning adjacent refrigerant passages in the tube main body, “Tb” is a thickness of an external peripheral wall of the tube main body.    
   
   
       5 . The heat exchanger as recited in  claim 4 , wherein the width W of the tube main body is set to be 6 to 14 mm.  
   
   
       6 . The heat exchanger as recited in  claim 4 , wherein the width W of the tube main body is set to be 7 to 12 mm.