Heat exchanger and refrigeration cycle apparatus

Abstract

A heat exchanger includes: a first heat transfer portion having a plurality of first heat transfer tubes; a second heat transfer portion having a plurality of second heat transfer tubes; and a zeotropic refrigerant flowing through the plurality of first heat transfer tubes of the first heat transfer portion and the plurality of second heat transfer tubes of the second heat transfer portion. The plurality of first heat transfer tubes of the first heat transfer portion and the plurality of second heat transfer tubes of the second heat transfer portion are arranged in a line. The first heat transfer portion and the second heat transfer portion are configured to allow the zeotropic refrigerant to flow from the first heat transfer portion and turn only once into the second heat transfer portion.

1 . A heat exchanger comprising:
 a first heat transfer portion having a plurality of first heat transfer tubes;   a second heat transfer portion having a plurality of second heat transfer tubes; and   a zeotropic refrigerant flowing through the plurality of first heat transfer tubes of the first heat transfer portion and the plurality of second heat transfer tubes of the second heat transfer portion,   the plurality of first heat transfer tubes of the first heat transfer portion and the plurality of second heat transfer tubes of the second heat transfer portion being arranged in a line, and   the first heat transfer portion and the second heat transfer portion being configured to allow the zeotropic refrigerant to flow from the first heat transfer portion and turn only once into the second heat transfer portion, wherein   a ratio of the number of the plurality of second heat transfer tubes of the second heat transfer portion to the number of the plurality of first heat transfer tubes of the first heat transfer portion is lower than that when an azeotropic refrigerant is used.   
     
     
         2 . (canceled) 
     
     
         3 . The heat exchanger according to claim  1  or  2 , further comprising a header, wherein
 the header is connected to each of both ends of each of the plurality of first heat transfer tubes of the first heat transfer portion and the plurality of second heat transfer tubes of the second heat transfer portion. 
 
     
     
         4 . The heat exchanger according to  claim 1 ,
 wherein   each of the plurality of first heat transfer tubes of the first heat transfer portion and the plurality of second heat transfer tubes of the second heat transfer portion is at least any one of an oval tube, a circular tube and a flat perforated tube.   
     
     
         5 . The heat exchanger according to  claim 1 ,
 further comprising a heat blocking mechanism, wherein   the heat blocking mechanism is provided between the first heat transfer portion and the second heat transfer portion.   
     
     
         6 . A refrigeration cycle apparatus comprising:
 the heat exchanger as recited in  claim 1 ; and   a compressor configured to compress the zeotropic refrigerant flowing into the heat exchanger.