Heat exchanger and refrigeration cycle apparatus including the heat exchanger

Abstract

Fins have a region not provided with a heat transfer promoting portion and a region other than the region provided with the heat transfer promoting portion, and the region not provided with the heat transfer promoting portion is set to a region between a lower end portion of a heat transfer tube and an upper end portion of a heat transfer tube.

1 . A heat exchanger comprising a plurality of fins arranged parallel to each other with predetermined gaps therebetween, and a plurality of heat transfer tubes that extend through the plurality of fins, the plurality of fins having a multi-column configuration, and the plurality of heat transfer tubes being aligned in a multiple of rows along a direction perpendicular to a direction in which the plurality of fins are aligned in columns,
 the plurality of heat transfer tubes including:   when the columns are numbered in ascending order from a most upstream side of flow of air flowing through the heat exchanger,   first heat transfer tubes that extend through the plurality of fins in a first column being one of the columns; and   second heat transfer tubes that extend through the plurality of fins in a second column being an other one of the columns and are positioned on upper sides and lower sides of the first heat transfer tubes in the direction in which the plurality of heat transfer tubes are aligned in the multiple of rows,   the plurality of fins in the first column and the plurality of fins in the second column being adjacent to each other in the columns and being are provided with first regions in at least a part of which a heat transfer promoting portion is formed, and second regions in which the heat transfer promoting portion is not formed, and   each of the second regions being included in at least one of a region between a lower end portion of one of the first heat transfer tubes and an upper end portion of one of the second heat transfer tubes closest to the one of the first heat transfer tubes, and a region between an upper end portion of an other one of the first heat transfer tubes and a lower end portion of the one of the second heat transfer tubes closest to the other one of the first heat transfer tubes, each of the second regions being a planar section continuing through one of the plurality of fins in the first column and one of the plurality of fins in the second column.   
     
     
         2 . The heat exchanger of  claim 1 , wherein each of the first regions is independent of the second regions. 
     
     
         3 . The heat exchanger of  claim 1 , wherein each of the second regions includes at least a central portion of the region between the lower end portion of the one of the first heat transfer tubes and the upper end portion of the one of the second heat transfer tubes closest to the one of the first heat transfer tubes. 
     
     
         4 . The heat exchanger of  claim 1 , wherein each of the second regions includes at least a central portion of the region between the upper end portion of the other one of the first heat transfer tubes and the lower end portion of the one of the second heat transfer tubes closest to the other one of the first heat transfer tubes. 
     
     
         5 . The heat exchanger of  claim 1 , wherein each of the second regions is a region excluding a stagnation region around the plurality of heat transfer tubes. 
     
     
         6 . The heat exchanger of  claim 1 , wherein each of the first regions is a region including a stagnation region of a slipstream behind the plurality of heat transfer tubes and having at least the heat transfer promoting portion. 
     
     
         7 . A refrigeration cycle apparatus comprising:
 a heat source unit equipped with the heat exchanger of  claim 1 ; and   a use-side unit connected to the heat source unit.   
     
     
         8 . The heat exchanger of  claim 1 , wherein the heat transfer promoting portion comprises a slit.