Heat exchanger and air conditioning system having same

Abstract

A heat exchanger having: a first heat exchanger core including a first sub-heat exchanger core and a second sub-heat exchanger core, wherein the first sub-heat exchanger core and the second sub-heat exchanger core includes heat exchange tubes, the heat exchange tubes of the first sub-heat exchanger core and the second sub-heat exchanger core are connected to each other, and orthographic projections of the first sub-heat exchanger core and the second sub-heat exchanger core on a plane where the second sub-heat exchanger core is located at least overlap partially; and a second heat exchanger core including a heat exchange tube, wherein the heat exchange tube of the second heat exchanger core is connected to the heat exchange tubes of the first sub-heat exchanger core and the second sub-heat exchanger core is disclosed. At the same incoming wind speed, the ratio of the wind resistance of the heat exchanger to the air passing through the first heat exchanger core to the wind resistance of the heat exchanger to the air passing through the second heat exchanger core is less than a predetermined value. By using the heat exchanger according to the present invention, the performance of the heat exchanger can be improved.

What is claimed is: 
     
         1 . A heat exchanger, comprising:
 a first heat exchanger core, the first heat exchanger core comprising a first secondary heat exchanger core and a second secondary heat exchanger core, each of the first secondary heat exchanger core and second secondary heat exchanger core comprising a heat exchange tube, the heat exchange tubes of the first secondary heat exchanger core and second secondary heat exchanger core being connected to each other, and orthographic projections of the first secondary heat exchanger core and second secondary heat exchanger core on a plane in which the second secondary heat exchanger core lies being at least partially overlapping; and   a second heat exchanger core, the second heat exchanger core comprising a heat exchange tube, the heat exchange tube of the second heat exchanger core being connected to the heat exchange tube of the second secondary heat exchanger core of the first heat exchanger core,   wherein, at the same incoming wind speed, the ratio of the wind resistance presented by the heat exchanger to air passing through the first heat exchanger core to the wind resistance presented by the heat exchanger to air passing through the second heat exchanger core is less than a predetermined value.   
     
     
         2 . The heat exchanger as claimed in  claim 1 , wherein:
 each of the first secondary heat exchanger core and second secondary heat exchanger core of the first heat exchanger core further comprises a fin;   the second heat exchanger core further comprises a fin; and   at the same incoming wind speed, the wind resistance or pressure drop caused by at least a portion of at least one fin of the second heat exchanger core is greater than the wind resistance or pressure drop caused by at least a portion of at least one fin of the first heat exchanger core.   
     
     
         3 . The heat exchanger as claimed in  claim 1 , wherein:
 a cross-sectional area of at least one heat exchange tube of the second heat exchanger core is greater than a cross-sectional area of at least one heat exchange tube of the first heat exchanger core.   
     
     
         4 . The heat exchanger as claimed in  claim 1 , further comprising:
 a first wind barrier plate, the first wind barrier plate being located at one side of the second heat exchanger core in the thickness direction of the second heat exchanger core; and orthographic projections of the first wind barrier plate and the second heat exchanger core on a plane in which the second heat exchanger core lies are at least partially overlapping.   
     
     
         5 . The heat exchanger as claimed in  claim 4 , further comprising:
 a connecting part, the heat exchange tubes of the first secondary heat exchanger core and second secondary heat exchanger core of the first heat exchanger core being connected via the connecting part,   the first wind barrier plate being located at the side of the first secondary heat exchanger core of the first heat exchanger core that is remote from the connecting part in the length direction of the heat exchange tube of the first secondary heat exchanger core of the first heat exchanger core.   
     
     
         6 . The heat exchanger as claimed in  claim 5 , wherein:
 the first wind barrier plate and the first secondary heat exchanger core of the first heat exchanger core are located at the same side of the second secondary heat exchanger core of the first heat exchanger core in the thickness direction of the second secondary heat exchanger core of the first heat exchanger core.   
     
     
         7 . The heat exchanger as claimed in  claim 4 , further comprising:
 a second wind barrier plate, wherein orthographic projections of the second wind barrier plate and the first heat exchanger core on a plane in which the second secondary heat exchanger core of the first heat exchanger core lies are at least partially overlapping.   
     
     
         8 . The heat exchanger as claimed in  claim 7 , wherein:
 in the thickness direction of the second secondary heat exchanger core of the first heat exchanger core, the first wind barrier plate and the second wind barrier plate are located at the opposite side of the second secondary heat exchanger core of the first heat exchanger core from the first secondary heat exchanger core; and at the same incoming wind speed, the wind resistance of the second wind barrier plate is less than or equal to the wind resistance of the first wind barrier plate.   
     
     
         9 . The heat exchanger as claimed in  claim 1 , further comprising:
 a third wind barrier plate, the third wind barrier plate being located between the first secondary heat exchanger core and second secondary heat exchanger core of the first heat exchanger core in the thickness direction of the second secondary heat exchanger core of the first heat exchanger core.   
     
     
         10 . The heat exchanger as claimed in  claim 1 , further comprising:
 a connecting part, the heat exchange tubes of the first secondary heat exchanger core and second secondary heat exchanger core of the first heat exchanger core being connected via the connecting part;   a first header, the first header being connected to the heat exchange tube of the second heat exchanger core at the side of the second heat exchanger core that is remote from the second secondary heat exchanger core of the first heat exchanger core; and   a second header, the second header being connected to the heat exchange tube of the first secondary heat exchanger core of the first heat exchanger core at the side of the first secondary heat exchanger core of the first heat exchanger core that is remote from the connecting part.   
     
     
         11 . (canceled) 
     
     
         12 . The heat exchanger as claimed in  claim 5 , wherein:
 the connecting part comprises multiple connecting tubes, and heat exchange tubes of the first secondary heat exchanger core of the first heat exchanger core are respectively connected to heat exchange tubes of the second secondary heat exchanger core of the first heat exchanger core via the multiple connecting tubes.   
     
     
         13 . The heat exchanger as claimed in  claim 1 , wherein:
 at least one of density, fin width, fin window angle, number of windows and window length of at least a portion of at least one fin of the second heat exchanger core is greater than at least one of density, fin width, fin window angle, number of windows and window length of at least a portion of at least one fin of the first heat exchanger core.   
     
     
         14 . An air-conditioning system, comprising:
 the heat exchanger as claimed in  claim 1 .   
     
     
         15 . The air-conditioning system as claimed in  claim 14 , wherein:
 the heat exchanger further comprises:   a connecting part, the heat exchange tubes of the first secondary heat exchanger core and second secondary heat exchanger core of the first heat exchanger core being connected via the connecting part;   a first header, the first header being connected to the heat exchange tube of the second heat exchanger core at the side of the second heat exchanger core that is remote from the second secondary heat exchanger core of the first heat exchanger core; and   a second header, the second header being connected to the heat exchange tube of the first secondary heat exchanger core of the first heat exchanger core at the side of the first secondary heat exchanger core of the first heat exchanger core that is remote from the connecting part.   
     
     
         16 . The air-conditioning system as claimed in  claim 15 , wherein:
 the first header and the second header are disposed horizontally in use.   
     
     
         17 . The air-conditioning system as claimed in  claim 14 , wherein:
 the heat exchanger further comprises:   a first header, the first header being connected to the heat exchange tube of the second heat exchanger core at the side of the second heat exchanger core that is remote from the second secondary heat exchanger core of the first heat exchanger core;   wherein the first header is disposed horizontally in use, and the first header is below the second heat exchanger core in use.   
     
     
         18 . The air-conditioning system as claimed in  claim 15 , wherein:
 in use, the first header is below the second heat exchanger core, and the second header is below the second secondary heat exchanger core of the first heat exchanger core.   
     
     
         19 . The air-conditioning system as claimed in  claim 15 , wherein:
 in use, the first header is above the second heat exchanger core, and the second header is above the second secondary heat exchanger core of the first heat exchanger core.   
     
     
         20 . The air-conditioning system as claimed in  claim 14 , wherein:
 in use, the second heat exchanger core and the second secondary heat exchanger core of the first heat exchanger core are located upstream of the first secondary heat exchanger core of the first heat exchanger core in the direction of flow of air through the heat exchanger.   
     
     
         21 . The air-conditioning system as claimed in  claim 14 , wherein:
 in use, the second heat exchanger core and the second secondary heat exchanger core of the first heat exchanger core are located downstream of the first secondary heat exchanger core of the first heat exchanger core in the direction of flow of air through the heat exchanger.