Heat exchanger tube and heat exchanger

Abstract

A heat exchanger tube ( 1 ), wherein a plurality of refrigerant passages ( 5 ) extending in the longitudinal direction of the tube are formed in a flat tube body ( 2 ) with a specified length parallel with each other in the lateral direction of the tube and, where the overall cross sectional area of the tube body ( 2 ) is (At), the overall cross sectional area of the refrigerant passage ( 5 ) is (Ac), the outer peripheral length of the tube body ( 2 ) is (L), and the overall inner peripheral length of the refrigerant passage ( 5 ) is (P), set so that the relation of Ac/At×100=30 to 55 and P/L×100=150 to 325 can be established, whereby a heat exchanging performance can be increased.

1 . A heat exchanger tube provided with a flat tube main body with a certain length having a plurality of refrigerant flow passages each extending in a tube longitudinal direction and disposed in parallel in a tube widthwise direction,
 wherein the following relations are established:   Ac/At×100=30 to 45; and   P/L×100=200 to 325,   wherein a total cross-sectional area of the tube main body (including the refrigerant passage portions) is “At”; a total cross-sectional area of the refrigerant flow passages is “Ac”; an external peripheral length of the tube main body is “L”; and a total internal peripheral length of the refrigerant passages is “P”.   
   
   
       2 . The heat exchanger tube as recited in  claim 1 , wherein Ac/At×100 is set to be 35 or more but 40 or less and P/L×100 is 250 or more. 
   
   
       3 . The heat exchanger tube as recited in  claim 1 , wherein the relation of H=0.5 to 1.5 mm is established, wherein a height of the tube main body is “H”. 
   
   
       4 . The heat exchanger tube as recited in  claim 1 , wherein the relation of W=10 to 20 mm is established, wherein a width of the tube main body is “W”. 
   
   
       5 . The heat exchanger tube as recited in  claim 1 , wherein the relation of ⅝<N/W is established, wherein the number of the refrigerant flow passages is “N” and a width of the tube is “W”. 
   
   
       6 . The heat exchanger tube as recited in  claim 1 , wherein the relation of Tb×⅛<Ta<Tb×⅔ is established, wherein a thickness of a partition wall between the adjacent refrigerant flow passages in the tube main body is “Ta”; and a thickness of an external peripheral wall of the tube main body “Tb”. 
   
   
       7 . A heat exchanger including a pair of headers disposed in parallel and a plurality of flat tubes with opposite ends thereof communicated with the headers, wherein refrigerant introduced via an refrigerant inlet of the header passes through the flat tubes while being exchanged heat and flows out of a refrigerant outlet of the header, wherein the flat tube has a flat tube main body having a predetermined length and a plurality of refrigerant passages each extending in the tube longitudinal direction and arranged in parallel in the tube widthwise direction, and wherein the relations of Ac/At×100=30 to 45 and P/L×100=200 to 325 are established, wherein a total cross-sectional area of the tube main body (including the refrigerant flow passages) is “At”; a total cross-sectional area of the refrigerant flow passages is “Ac”; an external peripheral length of the tube main body is “L”; and a total peripheral length of the refrigerant flow passages is “P”. 
   
   
       8 . A heat exchanger tube including a flat tube main body having a predetermined length provided with a plurality of refrigerant flow passages of a rectangular cross-section extending in the tube longitudinal direction and arranged in parallel in the tube widthwise direction, wherein the following formulas (f1) to (f4) are established:
   0.5 mm<H<1.5 mm  (f1)     ⅝ <N/W   (f2)       R <( H− 2 Tb )×⅓  (f3)       Tb× ⅛ <Ta<Tb× ⅔  (f4)   wherein a height of the tube main body is “H”; a width of the tube main body is “W”; the number of the refrigerant flow passages is “N”; a curvature radius of a corner portion in a cross-section of the refrigerant flow passage is “R”; a thickness of an external peripheral wall of the tube main body is “Tb”; and a thickness of a partition wall between adjacent refrigerant flow passages in the tube main body is “Ta”.   
   
   
       9 . A heat exchanger including a pair of headers disposed in parallel and a plurality of flat tubes with opposite ends thereof communicated with the headers, wherein refrigerant introduced via an refrigerant inlet of the header passes through the flat tubes while being exchanged heat and flows out of a refrigerant outlet of the header, wherein the flat tube has a flat tube main body having a predetermined length and a plurality of refrigerant passages each extending in the tube longitudinal direction and arranged in parallel in the tube widthwise direction, and wherein the following formulas (f1) to (f4) are established:
   0.5 mm<H<1.5 mm  (f1)     ⅝ <N/W   (f2)       R <( H− 2 Tb )×⅓  (f3)       Tb× ⅛ <Ta<Tb× ⅔  (f4)   wherein a height of the tube main body is “H”; a width of the tube main body is “W”; the number of the refrigerant flow passages is “N”; a curvature radius of a corner portion in a cross-section of the refrigerant flow passage is “R”; a thickness of an external peripheral wall of the tube main body is “Tb”; and a thickness of a partition wall between adjacent refrigerant flow passages in the tube main body is “Ta”.