Heat exchanger tube

Abstract

Disclosed is a heat exchanger tube ( 10 ) which is arranged so that air flow passes in an external circumference along a width direction thereof, and in which an internal passage ( 13 ) is divided by a partition wall ( 14 ) into an upstream side passage ( 13 a ) located on the upstream side of an air flow and a downstream side passage ( 13 b ) located on the downstream side of the air flow. The partition wall ( 14 ) is provided in the location such that a width (W 1 ) of the upstream side passage ( 13 a ) is wider and a width (W 2 ) of the downstream side passage ( 13 b ) is narrower.

1 . A heat exchanger tube arranged in a direction across an air flow such that air flows in an external circumference along with a width direction of the heat exchange tube, the heat exchanger tube comprising:
 an upstream side passage located on an upstream side of the air flow;   a downstream side passage located on a downstream side of the air flow; and   a partition wall for partitioning the upstream side passage and the downstream side passage,   wherein the partition wall is arranged such that a width of the upstream side passage is larger than a width of the downstream side passage.   
   
   
       2 . The heat exchanger tube according to  claim 1 , wherein the upstream side passage is provided with a projecting portion which projects from at least one side of an external wall portion. 
   
   
       3 . The heat exchanger tube according to  claim 2 , wherein the projecting portions are provided at a plurality of locations with intervals therebetween along a longitudinal direction. 
   
   
       4 . The heat exchanger tube according to  claim 3 , wherein the projecting portion is formed into a rectangular shape. 
   
   
       5 . The heat exchanger tube according to  claim 3 , wherein the projecting portion is formed into an elliptic shape.