Heat exchanger

Abstract

A heat exchanger includes heat transfer tubes forming one or more refrigerant passages, and a plurality of plate-shaped fins aligned and stacked at a predetermined spacing with the heat transfer tubes passing through in a substantially perpendicular manner. A relationship between a center-to-center distance S between an adjacent pair of heat transfer tubes and an outside diameter D of the heat transfer tubes is 2.5<S/D<3.5. The center-to-center distance S is measured substantially perpendicularly to the adjacent pair of heat transfer tubes. A relationship between a length L of the one or more refrigerant passages and the outside diameter D of the heat transfer tubes is 0.28×D 1.17 <L<1.10×D 1.17 . The heat exchanger is preferably for a refrigerant circuit using either a single refrigerant or a mixed refrigerant including the single refrigerant. The single refrigerant includes an organic compound having a molecular formula C 3 H m F n (where m=1 to 5, n=1 to 5, and m+n=6) and a molecular structure with one double bond.

1 . A heat exchanger of a refrigerant circuit using a refrigerant, which is either a single refrigerant or a mixed refrigerant including the single refrigerant, the single refrigerant including an organic compound having a molecular formula expressed as C 3 H m F n  (wherein m=1 to 5, n=1 to 5, and m+n=6) and a molecular structure with one double bond, the heat exchanger comprising:
 a plurality of heat transfer tubes forming one or more refrigerant passages configured to allow the refrigerant to flow therethrough; and   a plurality of plate-shaped fins aligned and stacked at a predetermined spacing with the heat transfer tubes passing therethrough in a substantially perpendicular manner,   a relationship between a center-to-center distance S between an adjacent pair of the heat transfer tubes and an outside diameter D of the heat transfer tubes is 2.5<S/D<3.5, where the center-to-center distance S is measured in a direction substantially perpendicular to the adjacent pair of the heat transfer tubes, and   a relationship between a length L of the one or more refrigerant passages and the outside diameter D of the heat transfer tubes is 0.28×D 1.17 <L<1.10 ×D 1.17 .   
     
     
         2 . The heat exchanger according to  claim 1 , wherein
 the single refrigerant includes 2,3,3,3-tetrafluoro-1-propene.   
     
     
         3 . The heat exchanger according to  claim 1 , wherein
 the refrigerant circuit uses the mixed refrigerant, and the mixed refrigerant includes 2,3,3,3-tetrafluoro-1-propene and difluoromethane.   
     
     
         4 . The heat exchanger according to  claim 1 , wherein
 the refrigerant circuit uses the mixed refrigerant, and the mixed refrigerant includes 2,3,3,3-tetrafluoro-1-propene and pentafluoroethane.