Air Conditioner

Abstract

Heat transfer pipes 26 b 1 and 26 b 2 extend from the other end section 21 B to one end section 21 A in an intermediate row L 2 and combine in the one end section 21 A to be heat transfer pipes 26 c 1 and 26 c 2 . The heat transfer pipes 26 c 1 and 26 c 2 are configured to extend back and force once between the one end section 21 A and the other end section 21 B in a upstream row L 1 . Heat transfer pipes 26 b 3 and 26 b 4 extend from the other end section 21 B to the one end section 21 A in the intermediate row L 2 and combine in the one end section 21 A to be heat transfer pipes 26 c 3 and 26 c 4 . The heat transfer pipes 26 c 3 and 26 c 4 are configured to extend back and force once between the one end section 21 A and the other end section 21 B in the upstream row L 1 . The heat transfer pipe 26 c 2 extending from the other end section 21 B to the one end section 21 A and the heat transfer pipe 26 c 4 from the other end section 21 B to the one end section 21 A are arranged to be adjacent to each other.

What is claimed is: 
     
         1 . An air conditioner comprising:
 a heat exchanger that includes a plurality of heat transfer pipes, through which a refrigerant flows, and performs heat exchange with air, wherein   the heat exchanger includes one end section and the other end section,   the plurality of heat transfer pipes are disposed to extend back and force between the one end section and the other end section in a state in which the heat transfer pipes are arranged in a direction crossing a direction in which the air flows, and rows of the plurality of heat transfer pipes arranged in the crossing direction are configured to be arranged in at least two rows along the direction in which the air flows,   the two rows include a first row located most upstream in the direction in which the air flows and a second row located adjacent to the first row in the direction in which the air flows,   the plurality of heat transfer pipes include a first heat transfer pipe and a second heat transfer pipe adjacent to each other in the second row, the first heat transfer pipe and the second heat transfer pipe extend from the other end section to the one end section in the second row and are combined in the one end section to be a first combined pipe, and the first combined pipe is configured to extend back and force once between the one end section and the other end section in the first row,   the refrigerant is R32 or a refrigerant containing 70 wt. % or more of R32,   the heat exchanger includes a plurality of fins attached around the plurality of heat transfer pipes, and   the plurality of fins are tabular and, when plate thickness of the fins is represented by t [mm] and an interval of the fins adjacent to each other is represented by pf [mm], 0.06≤t/pf≤0.12 is established.   
     
     
         2 . The air conditioner according to  claim 1 , further comprising an indoor unit of a ceiling embedded cassette type, wherein
 the heat exchanger is used in the indoor unit.   
     
     
         3 . The air conditioner according to  claim 1 , wherein a distance between centers of the heat transfer pipes adjacent to each other in the crossing direction in the rows is equal to or larger than 11 mm and equal to or smaller than 17 mm. 
     
     
         4 . The air conditioner according to  claim 1 , wherein a distance between straight lines passing centers of the heat transfer pipes configuring the rows is equal to or larger than 7 mm and equal to or smaller than 11 mm.