Heat exchanger

Abstract

A heat exchanger includes: a first heat exchanger configured to transfer heat between air and refrigerant; and a second heat exchanger provided in series with the first heat exchanger in a first direction that is a flow direction of the air, and configured to transfer heat between the air and the refrigerant. The first heat exchanger includes first heat transfer tubes through which the refrigerant flows, which are spaced apart from each other in a second direction intersecting the first direction, and each of which has a tube axis extending in a third direction intersecting the first and second directions. The second heat exchanger includes: second heat transfer tubes though which the refrigerant flows, which are spaced apart from each other in the second direction, and each of which has a tube axis extending in the third direction; and a corrugated fin provided between the second heat transfer tubes.

1 . A heat exchanger comprising:
 a first heat exchanger configured to cause heat exchange to be performed between air and refrigerant; and   a second heat exchanger provided in series with the first heat exchanger in a first direction that is a flow direction of the air, and configured to cause heat exchange to be performed between the air and the refrigerant,   wherein the first heat exchanger includes
 a plurality of first heat transfer tubes through which the refrigerant flows, the plurality of first heat transfer tubes being spaced apart from each other in a second direction that intersects the first direction, the plurality of first heat transfer tubes each having a tube axis extending in a third direction that intersects each of the first direction and the second direction, 
   wherein the second heat exchanger includes
 a plurality of second heat transfer tubes though which the refrigerant flows, the plurality of second heat transfer tubes being spaced apart from each other in the second direction, the plurality of second heat transfer tubes each having a tube axis extending in the third direction, and 
 a corrugated fin provided between the plurality of second heat transfer tubes, and 
   wherein a length of each of the plurality of first heat transfer tubes of the first heat exchanger in the second direction is smaller than a length of each of the plurality of second heat transfer tubes of the second heat exchanger in the second direction.   
     
     
         2 . The heat exchanger of  claim 1 ,
 wherein the first heat exchanger is provided at a front row on a windward side in the first direction, and   wherein the second heat exchanger is located at a rear row on a leeward side in the first direction.   
     
     
         3 . The heat exchanger of  claim 1 , wherein the third direction is a vertical direction. 
     
     
         4 . The heat exchanger of  claim 1 , wherein the first heat exchanger is a finless heat exchanger in which no heat transfer member is provided between the plurality of first heat transfer tubes. 
     
     
         5 . The heat exchanger of  claim 1 ,
 wherein the second heat exchanger is a corrugated-fin heat exchanger including the corrugated fin, and   wherein the corrugated fin is formed of a wavy plate-shaped member that has fin body portions and a bent portion, the fin body portions being spaced apart from each other in the third direction and extending in the second direction, the bent portion connecting adjacent two of the fin body portions to each other and extending in the third direction.   
     
     
         6 . The heat exchanger of  claim 1 , wherein at least part of the first heat transfer tubes is aligned with the corrugated fin of the second heat exchanger in the first direction. 
     
     
         7 . The heat exchanger of  claim 1 ,
 wherein the plurality of first heat transfer tubes are arranged at a first pitch PP 1  in the second direction,   wherein the plurality of second heat transfer tubes are arranged at a second pitch PP 2  in the second direction, and   wherein the first pitch PP 1  is smaller than the second pitch PP 2 .   
     
     
         8 . The heat exchanger of  claim 5 ,
 wherein the plurality of first heat transfer tubes are spaced apart from each other by a first distance PC 1  in the second direction,   wherein the fin body portions of the corrugated fin are spaced apart from each other by a third distance FC 2  in the third direction, and   wherein the first distance PC 1  is greater than the third distance FC 2 .   
     
     
         9 . The heat exchanger of  claim 1 , wherein each of the first heat transfer tubes of the first heat exchanger includes a first projection located at a front edge portion that is an end portion of the first heat transfer tube on a windward side, the first projection projecting from the front edge portion in the opposite direction to the first direction. 
     
     
         10 . The heat exchanger of  claim 1 , wherein each of the first heat transfer tubes of the first heat exchanger includes a second projection located at a rear edge portion that is an end portion of the first heat transfer tube on a leeward side, the second projection projecting from the rear edge portion in the first direction. 
     
     
         11 . The heat exchanger of  claim 1 , wherein the corrugated fin is provided only at part of each of the second heat transfer tubes that is located on a leeward side in the first direction. 
     
     
         12 . A heat exchanger comprising:
 a first heat exchanger configured to cause heat exchange to be performed between air and refrigerant; and   a second heat exchanger provided in series with the first heat exchanger in a first direction that is a flow direction of the air, and configured to cause heat exchange to be performed between the air and the refrigerant,   wherein the first heat exchanger includes   a plurality of first heat transfer tubes through which the refrigerant flows, the plurality of first heat transfer tubes being spaced apart from each other in a second direction that intersects the first direction, the plurality of first heat transfer tubes each having a tube axis extending in a third direction that intersects each of the first direction and the second direction,   wherein the second heat exchanger includes
 a plurality of second heat transfer tubes though which the refrigerant flows, the plurality of second heat transfer tubes being spaced apart from each other in the second direction, the plurality of second heat transfer tubes each having a tube axis extending in the third direction, and 
 a corrugated fin provided between the plurality of second heat transfer tubes, and 
   wherein the corrugated fin is located only at part of each of the second heat transfer tubes that is located on a lower side in the third direction.