Heat exchanger

Abstract

The heat exchanger includes: a plurality of fins disposed, spaced apart from each other; and a plurality of heat transfer tubes inserted in the plurality of fins. The plurality of heat transfer tubes have round profiles. The plurality of heat transfer tubes have outer circumferential surfaces in contact with the plurality of fins. The plurality of heat transfer tubes have outer diameters of 5.4 mm or less. The plurality of fins and the heat transfer tubes are disposed so that ratios of thicknesses of the plurality of fins to the outer diameters are 0.03 or greater.

1 . A heat exchanger, comprising:
 a plurality of fins disposed, spaced apart from each other; and   a plurality of heat transfer tubes inserted in the plurality of fins, wherein   the plurality of heat transfer tubes have round profiles,   the plurality of heat transfer tubes have outer circumferential surfaces in contact with the plurality of fins,   the plurality of heat transfer tubes have outer diameters D 0  of 5.4 mm or less,   the plurality of fins and the heat transfer tubes are disposed so that ratios tf/D 0  of thicknesses tf of the plurality of fins to the outer diameters D 0  are 0.03 or greater, and   the plurality of fins and the heat transfer tubes are disposed so that the outer diameters Do are greater than or equal to 5.2 mm and less than or equal to 5.4 mm, and the ratios tf/D 0  are greater than or equal to 0.036 and less than or equal to 0.040.   
     
     
         2 . (canceled) 
     
     
         3 . A heat exchanger, comprising:
 a plurality of fins disposed, spaced apart from each other; and   a plurality of heat transfer tubes inserted in the plurality of fins, wherein   the plurality of heat transfer tubes have round profiles,   the plurality of heat transfer tubes have outer circumferential surfaces in contact with the plurality of fins,   the plurality of heat transfer tubes have outer diameters D 0  of 5.4 mm or less,   the plurality of fins and the heat transfer tubes are disposed so that ratios tf/D 0  of thicknesses tf of the plurality of fins to the outer diameters D 0  are 0.03 or greater, and   the plurality of fins and the heat transfer tubes are disposed so that the outer diameters Do are greater than or equal to 3.6 mm and less than or equal to 3.8 mm and the ratios tf/D 0  are greater than or equal to 0.038 and less than or equal to 0.058.   
     
     
         4 . The heat exchanger according to  claim 1 , wherein
 the plurality of heat transfer tubes are each formed of a single material.   
     
     
         5 . The heat exchanger according to  claim 1 , wherein
 materials comprising the plurality of fins include aluminum, and   materials comprising the plurality of heat transfer tubes include copper.   
     
     
         6 . The heat exchanger according to  claim 3 , wherein
 the plurality of heat transfer tubes are each formed of a single material.   
     
     
         7 . The heat exchanger according to  claim 3 , wherein
 materials comprising the plurality of fins include aluminum, and   materials comprising the plurality of heat transfer tubes include copper.   
     
     
         8 . The heat exchanger according to  claim 4 , wherein
 materials comprising the plurality of fins include aluminum, and   materials comprising the plurality of heat transfer tubes include copper.   
     
     
         9 . The heat exchanger according to  claim 6 , wherein
 materials comprising the plurality of fins include aluminum, and   materials comprising the plurality of heat transfer tubes include copper.