Patent Publication Number: US-11041676-B2

Title: Heat exchanger

Description:
CROSS-REFERENCE TO RELATED PATENT APPLICATIONS 
     This application is a U.S. National Stage Application under 35 U.S.C. § 371 of PCT Application No. PCT/KR2016/008336, filed Jul. 29, 2016, which claims priority to Korean Patent Application No. 10-2015-0108929, filed Jul. 31, 2015; Korean Patent Application No. 10-2016-0086782, filed Jul. 8, 2016; and Korean Patent Application No. 10-2016-0095052, filed Jul. 26, 2016, whose entire disclosures are hereby incorporated by reference. 
     TECHNICAL FIELD 
     The present invention relates to a heat exchanger and, more particularly, to a heat exchanger capable of easily discharging condensate water when it is used as an evaporator. 
     BACKGROUND ART 
     In general, a heat exchanger may be used as a condenser or an evaporator in a cooling cycle apparatus including a compressor, a condenser, an expansion apparatus, and an evaporator. 
     Furthermore, the heat exchanger is disposed in a vehicle or a refrigerator and heat-exchange a refrigerant and air. 
     The heat exchanger may be divided into a fin tube type heat exchanger and a micro channel type heat exchanger depending on its structure. 
     The fin tube type heat exchanger is fabricated using a copper material, and the micro channel type heat exchanger is fabricated using an aluminum material. 
     The micro channel type heat exchanger has better efficiency than the fin tube type heat exchange because a fine flow channel is formed in the micro channel type heat exchanger. 
     The fin tube type heat exchanger is easily fabricated because a fin and a tube are welded, whereas the micro channel type heat exchanger has a disadvantage in that an initial investment cost according to fabrication is high because it is fabricated through brazing by inputting it into a furnace. 
       FIG. 1  is a cross-sectional view of a micro channel type heat exchanger according to a conventional technology. 
     The micro channel type heat exchanger according to a conventional technology includes a plurality of flat tubes  1  in which fine flow channels are formed therein, fin  2  disposed between the flat tubes  1  and connecting the flat tubes  1  to conduct heat, and headers  3  and  4  assembled with one side and the other side of the flat tubes  1 . 
     The fins  2  are coupled to the flat tubes  1  disposed on both sides. The fins  2  are disposed in zigzags in the length direction of the flat tubes  1 . 
     The conventional micro channel type heat exchanger fabricated as described above has very higher heat exchange efficiency of a refrigerant and air than the fin tube type heat exchanger, but has a problem in that the discharge of generated condensate water is difficult if the exchanger is used as an evaporator. 
     The conventional micro channel type heat exchanger has a problem in that heat efficiency of an evaporator is deteriorated because condensate water generated when the exchanger is used as the evaporator is not discharged and the generated condensate water is stagnated between the fin and frozen. 
     PRIOR ART DOCUMENT 
     Patent Document 
     
         
         Korean Patent No. 10-0765557 
       
    
     DISCLOSURE 
     Technical Problem 
     An object of the present invention is to provide a micro channel type heat exchanger capable of easily discharging condensate water. 
     An object of the present invention is to provide a micro channel type heat exchanger capable of being fabricated in a fin roll method. 
     An object of the present invention is to provide a micro channel type heat exchanger in which a fluid can easily flow in the length direction of a flat tube and a direction orthogonal to the length direction of the flat tube. 
     An object of the present invention is to provide a micro channel type heat exchanger having a structure in which condensate water generated from a fin disposed on the upper side can easily flow to a fin disposed on the lower side. 
     Objects of the present invention are not limited to the above-described objects and other objects not described above will be evidently understood by those skilled in the art from the following description. 
     Technical Solution 
     In the present invention, a heat exchanger includes a flat tube horizontally formed in a micro channel type; a first fin disposed over the flat tube to conduct heat of the flat tube; and a second fin disposed under the flat tube to conduct heat of the flat tube, wherein: 
     The first fin includes a first fin part disposed over the flat tube and disposed to cross the flat tube; a second fin part disposed over the flat tube, disposed to cross the flat tube and disposed to be isolated from the first fin part; a first bent part bent from the first fin part and the second fin part to connect upper parts of the first fin part and the second fin part; a second bent part bent from the first fin part and the second fin part to connect lower parts of the first fin part and the second fin part; a flow space formed between the isolated first fin part and second fin part and formed to be open back and forth; a first condensate water discharge fin forming a first condensate water discharge hole by cutting off the first bent part and upward bent from the first bent part; and a second condensate water discharge fin forming a second condensate water discharge hole by cutting off the second bent part and downward bent from the second bent part, and 
     The second fin includes a first fin part disposed over the flat tube and disposed to cross the flat tube; a second fin part disposed over the flat tube, disposed to cross the flat tube and disposed to be isolated from the first fin part; a first bent part bent from the first fin part and the second fin part to connect upper parts of the first fin part and the second fin part; a second bent part bent from the first fin part and the second fin part to connect lower parts of the first fin part and the second fin part; a flow space formed between the isolated first fin part and second fin part and formed to be open back and forth; a first condensate water discharge fin forming a first condensate water discharge hole by cutting off the first bent part and upward bent from the first bent part; and a second condensate water discharge fin forming a second condensate water discharge hole by cutting off the second bent part and downward bent from the second bent part. 
     The second condensate water discharge fin of the first fin and the first condensate water discharge fin of the second fin may be disposed to come into contact with each other. 
     The second condensate water discharge fin of the first fin and the first condensate water discharge fin of the second fin may be disposed to be isolated from each other. 
     The second condensate water discharge hole may be disposed at the bottom of the flow space of the first fin. 
     The first condensate water discharge hole and the second condensate water discharge hole may be disposed outside the flat tube. 
     The first condensate water discharge fin and the first condensate water discharge hole may be formed ahead of and behind the flat tube, respectively. 
     The second condensate water discharge fin and the second condensate water discharge hole may be formed ahead of and behind the flat tube, respectively. 
     The second condensate water discharge fin forming the second condensate water discharge hole of the first fin part may be formed in a plural number, and the first condensate water discharge fin of the second fin part may be disposed to come into contact with any one of the plurality of second condensate water discharge fins. 
     The first condensate water discharge fin forming the first condensate water discharge hole of the second fin part may be formed in a plural number, and the second condensate water discharge fin of the first fin part may be disposed to come into contact with any one of the plurality of first condensate water discharge fins. 
     The second condensate water discharge fin forming the second condensate water discharge hole of the first fin part may be formed in a plural number, the first condensate water discharge fin forming the first condensate water discharge hole of the second fin part may be formed in a plural number, and the plurality of second condensate water discharge fins may be disposed to come into contact with the plurality of first condensate water discharge fins, respectively. 
     A connection part left over in the first bent part when the first condensate water discharge fin is formed and disposed at the edge of the first bent part to connect the first fin part and the second fin part may be further included. 
     A connection part left over in the second bent part when the second condensate water discharge fin is formed and disposed at the edge of the second bent part to connect the first fin part and the second fin part may be further included. 
     The first fin may include a unit wave including the first fin part, the first bent part, the second fin part and the second bent part, a plurality of the unit waves may be formed to extend in a length direction of the flat tube, and the unit waves may be formed in a wave form. 
     At least any one of the first bent part and the second bent part may be formed in an arc form. 
     The first fin may include a unit wave including the first fin part, the first bent part, the second fin part and the second bent part, a plurality of the unit waves may be formed to extend in a length direction of the flat tube, and the unit waves may be formed in a trapezoid form. 
     The first fin part and the second fin part may be slantly disposed with respect to an up and down direction, and the slope direction of the first fin part and the slope direction of the second fin part may be disposed in opposite directions. 
     The slope direction of the first fin part and the slope direction of the second fin part may stand face to face with respect to an up and down direction. 
     The first fin may include a unit wave including the first fin part, the first bent part, the second fin part and the second bent part, a plurality of the unit waves may be formed to extend in a length direction of the flat tube, and the unit waves may be formed in a parallelogram form. 
     Advantageous Effects 
     The heat exchanger of the present invention has one or more following effects. 
     First, the present invention has an advantage in that condensate water can be easily moved to a fin disposed on the lower side through the condensate water discharge hole and the condensate water discharge fin. 
     Second, the present invention has an advantage in that it can be fabricated through a machine of a fin roll method because the condensate water discharge hole and the condensate water discharge fin are formed by cutting off and bending part of the first fin part and the second fin part. 
     Third, the present invention has an advantage in that a fabrication cost is low because it can be fabricated through a machine of a fin roll method. 
     Fourth, the present invention has an advantage in that condensate water can easily move through contacted condensate water discharge fin because a condensate water discharge fin disposed on the lower side of a first fin and a condensate water discharge fin disposed on the upper side of a second fin are brought in contact with each other. 
     Fifth, the present invention has an advantage in that condensate water can easily move through separated condensate water discharge fins because a condensate water discharge fin disposed on the lower side of a first fin and a condensate water discharge fin disposed on the upper side of a second fin are spaced apart at a specific interval. 
     Sixth, the present invention has an advantage in that condensate water can be easily discharged because the condensate water discharge fin, the flow space, and the condensate water discharge hole are disposed in a row with respect to an up and down direction. 
     Seventh, the present invention has an advantage in that a unit wave including a first fin part, a first bent part, a second fin part and a second bent part can be formed in variously manners, such as a right-angle wave form, a curved wave form, a trapezoid form and a parallelogram form. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG. 1  is a cross-sectional view of a micro channel type heat exchanger according to a conventional technology. 
         FIG. 2  is a perspective view of a micro channel type heat exchanger according to the first embodiment of the present invention. 
         FIG. 3  is a front view of  FIG. 2 . 
         FIG. 4  is a plane view of  FIG. 2 . 
         FIG. 5  is a left side view of  FIG. 2 . 
         FIG. 6  is a perspective view of a micro channel type heat exchanger according to the second embodiment of the present invention. 
         FIG. 7  is a front view of  FIG. 6 . 
         FIG. 8  is a plane view of  FIG. 6 . 
         FIG. 9  is a right side view of  FIG. 6 . 
         FIG. 10  is a perspective view of a micro channel type heat exchanger according to a third embodiment of the present invention. 
         FIG. 11  is a front view of  FIG. 10 . 
         FIG. 12  is a right side view of  FIG. 10 . 
         FIG. 13  is a perspective view of a micro channel type heat exchanger according to a fourth embodiment of the present invention. 
         FIG. 14  is a perspective view of a micro channel type heat exchanger according to a fifth embodiment of the present invention. 
         FIG. 15  is a perspective view of a micro channel type heat exchanger according to a sixth embodiment of the present invention. 
         FIG. 16  is a perspective view of a micro channel type heat exchanger according to a seventh embodiment of the present invention. 
         FIG. 17  is a perspective view of a micro channel type heat exchanger according to an eighth embodiment of the present invention. 
         FIG. 18  is a graph showing a change of Wet/Dry ΔP according to the interval between condensate water discharge fins and the protruded length of the condensate water discharge fin according to a third embodiment of the present invention. 
         FIG. 19  is a perspective view of a micro channel type heat exchanger according to a ninth embodiment of the present invention. 
         FIG. 20  is a rear-side perspective view of  FIG. 19 . 
         FIG. 21  is a front view of  FIG. 19 . 
         FIG. 22  is a plane view of  FIG. 19 . 
         FIG. 23  is a left side view of  FIG. 19 . 
         FIG. 24  is a perspective view of a micro channel type heat exchanger according to a tenth embodiment of the present invention. 
         FIG. 25  is a front view of  FIG. 24 . 
         FIG. 26  is a plane view of  FIG. 24 . 
         FIG. 27  is a right side view of  FIG. 24 . 
     
    
    
     BEST MODE 
     Hereinafter, the present invention is described in detail with reference to the accompanying drawings. 
     A micro channel heat exchanger according to a first embodiment is described with reference to  FIGS. 2 to 5 . 
     The micro channel type heat exchanger according to the present embodiment includes a plurality of flat tubes  10  in which a plurality of flow channels has been formed, fins  20  disposed between two flat tubes  10  and coupled to the two flat tubes  10  to conduct heat, and a first header (not shown) and a second header (not shown) assembled with both ends of the plurality of flat tubes  10  to move a refrigerant. 
     In the micro channel type heat exchanger, if a refrigerant is supplied to the first header, the refrigerant passes through the flat tubes  10  and moves to the second header. In contrast, if a refrigerant is supplied to the second header, the refrigerant flows to the first header. 
     The first header and the second header have structures widely known to those skilled in the art, and a detailed description thereof is omitted. 
     The flat tube  10  is formed in a flat shape and has a plurality of flow channels formed therein. The flat tube  10  is formed using a metal material. In the present embodiment, the flat tube is formed using an aluminum material. 
     In the present embodiment, the flat tube  10  is horizontally disposed, and the extension direction of the fins  20  is horizontally disposed. The micro channel type heat exchanger according to the present embodiment has a structure in which the flat tubes  10  and the fins  20  are horizontally disposed to easily discharge condensate water. 
     Unlike in the present embodiment, the flat tube  10  and the extension direction of the fins  20  may be vertically disposed. 
     The fin  20  is bent in the length direction (left and right direction in the drawing) of the flat tube  10 . The fin  20  has an advantage in that a fabrication cost is low because the fin can be fabricated through a consecutive process according to a fin roll method. 
     The fin  20  is formed using a metal material. In the present embodiment, the fin is made of the same aluminum as the flat tube  10 . The fin  20  is for improving heat exchange efficiency by rapidly conducting heat of the flat tube  10 . 
     The fins  20  are disposed between the flat tubes  10 . For a description, the fin  20  at the top is defined as a first fin  20 - 1 , a fin  20  disposed under the first fin  20 - 1  is defined as a second fin  20 - 2 , and a fin  20  disposed under the second fin  20 - 2  is defined as a third fin  20 - 3 . 
     The fin  20  includes a first fin part  30  disposed between two flat tubes  10 , a first bent part  50  bent from the first fin part  30  and coming into contact with one of the two flat tubes  10 , a second fin part  40  bent from the first bent part  50 , disposed opposite the first fin part  30 , and disposed between the two flat tubes  10 , and a second bent part  60  bent from the second fin part  40  and coming into contact with one of the two flat tubes  10 . 
     For convenience of description, the flat tube  10  coming into contact with the first bent part  50  is defined as a first flat tube  11 , and the flat tube  10  coming into contact with the second bent part  60  is defined as a second flat tube  12 . 
     The first fin  20 - 1  is disposed over the second flat tube  12 , and the second fin  20 - 2  is disposed under the second flat tube  12 . 
     In the fin  20 , the first fin part  30 , the first bent part  50 , the second fin part  40  and the second bent part  60  are repeatedly formed. 
     The first fin part  30  supports the first flat tube  11  and the second flat tube  12 . 
     The first fin part  30  is orthogonally disposed with respect to the length direction of the first flat tube  11  and the second flat tube  12 . 
     Like the first fin part  30 , the second fin part  40  supports the first flat tube  11  and the second flat tube  12  and is orthogonally disposed with respect to the length direction of the first flat tube  11  and the second flat tube  12 . 
     The first fin part  30  and the second fin part  40  are spaced apart at a specific distance. A flow space  25  in which air flows is formed between the first fin part  30  and the second fin part  40 . Air for heat exchange passes through the flow space  25  formed between the first fin part  30  and the second fin part  40 . 
     In the present embodiment, air flows from the front side to the rear side. The flow space  25  is formed from the front side to the rear side. 
     The flow space  25  formed between the first fin part  30  and the second fin part  40  is horizontally open. Any one of the top and bottom of the flow space  25  is open to the bent part, and the other thereof is closed by the flat tube. 
     As the interval between the flow spaces  25  formed between the first fin part  30  and the second fin part  40  is narrower, more fin parts can be disposed. Accordingly, heat exchange efficiency can be improved. 
     In this case, if the interval between the flow spaces  25  is narrow, condensate water generated when the heat exchanger operates as an evaporator can be attached and fixed to the first fin part  30  and the second fin part  40  by surface tension. In the present embodiment, the interval is formed so that condensate water does not connect the first fin part  30  and the second fin part  40  by surface tension. 
     Condensate water generated from the first fin part  30  and the second fin part  40  downward flows because it comes into contact with air that flows along the flow space  25 . 
     Vents  21  and  22  communicating with a neighbor flow space  25 ′ are formed in at least any one of the first fin part  30  and the second fin part  40 . 
     In the present embodiment, the vents  21  and  22  are formed in both the first fin part  30  and the second fin part  40 . Furthermore, the two vents  21  and  22  are formed in the first fin part  30  and the second fin part  40 . Unlike in the present embodiment, only one vent may be formed in the first fin part  30  and the second fin part  40 . 
     For convenience of description, the vents  21  and  22  are defined as a first vent  21  and a second vent  22 . 
     The vents  21  and  22  may be formed in a hole or slit form. 
     In the present embodiment, the vents  21  and  22  are formed by cutting off the first fin part  30  and the second fin part  40 . 
     A (1-1)-th louver  31  that forms the first vent  21  is formed in the first fin part  30 . Furthermore, a (1-2)-th louver  32  that forms the second vent  22  is formed in the first fin part  30 . 
     The cut first fin part  30  is bent to form the (1-1)-th louver  31 . The first vent  21  is formed at the position where the (1-1)-th louver  31  has been cut off. 
     The (1-2)-th louver  32  is also formed using the same method as the (1-1)-th louver  31 . 
     The louvers  31  and  32  function to guide some of air, flowing along the flow space  25 , to a neighbor flow space  25 ′. 
     In the present embodiment, the (1-1)-th louver  31  and the (1-2)-th louver  32  are formed to guide air in different directions. 
     For example, if the (1-1)-th louver  31  has been formed to guide air from a neighbor flow space  25 ′ to the flow space  25 , the (1-2)-th louver  32  is formed to guide air from the flow space  25  to the neighbor flow space  25 ′. 
     The louver is protruded from the first fin part  30  or the second fin part  40  to the flow space  25  or a neighbor flow space  25 ′. 
     The louver is vertically formed with respect to the length direction of the first flat tube  11  and the second flat tube  12 . 
     A louver formed in the second fin part  40  has the same structure as a louver formed in the first fin part  30 , which are defined as a (2-1)-th louver  41  and a (2-2)-th louver  42 , for convenience of description. 
     The first vent  21  is formed in the second fin part  40  by the (2-1)-th louver  41 , and the second vent  22  is formed by the (2-2)-th louver  42 . 
     Since the (1-1)-th louver  31  and the (1-2)-th louver  32  are formed in opposite directions, the direction in which the fin  20  is installed when the heat exchanger is installed may not be considered. 
     The first bent part  50  is closely attached to the first flat tube  11  and conducts heat of the first flat tube  11 . 
     In the present embodiment, the first bent part  50  is formed in a plane form. 
     In the present embodiment, the first bent part  50  is disposed on the upper side and the second bent part  60  is disposed on the lower side. However, the second bent part  60  may be disposed on the upper side and the first bent part  50  may be disposed on the lower side. 
     The vents and the louver are also shaped by a consecutive process by a fabrication method of a fin roll method. 
     Condensate water discharge fins  70  and  71  for discharging the condensate water of the flow space  25  are formed in the first bent part  50 . The condensate water discharge fin  70  is cut off from the first bent part  50  and then bent and formed. 
     A condensate water discharge hole  51  is formed at the position where the condensate water discharge fin  70  was placed in the first bent part  50 . The condensate water discharge hole formed in the first bent part  50  is defined as the first condensate water discharge hole  51 . 
     The condensate water discharge hole  51  is disposed in the first bent part  50 , but is located outside the flat tube  10 . The condensate water discharge hole  51  is not covered by the flat tube  10 . 
     In the present embodiment, two condensate water discharge fin  70  are formed in the first bent part  50  so that they face each other. Only one condensate water discharge hole  51  is formed. Unlike in the present embodiment, the condensate water discharge holes  51  may be formed ahead of and behind the flat tube  10 . 
     Since the two condensate water discharge fins  70  are formed in a limited area, the condensate water discharge fin  70  is fabricated to have a length that is half or less of the width of the first bent part  50 . 
     Furthermore, a connection part  52  connecting the first fin part  30  and the second fin part  40  is formed at the edge of the first bent part  50 . 
     The connection part  52  is a part left over when the condensate water discharge fin  70  is formed. Accordingly, the connection part  52  is formed to come into contact with the condensate water discharge hole  51 . The connection part  52  connects the first fin part  30  and the second fin part  40 , thus improving strength of the fin  20 . 
     Condensate water located in the flow space  25  can be discharged to the outside of the flow space  25  through the condensate water discharge hole  51 . 
     The condensate water discharge fin  70  guides a flow of the condensate water when the condensate water is discharged. The flow space  25  of another fin is disposed under the condensate water discharge fin  70 , and condensate water flows into the flow space of another fin. 
     The condensate water discharge hole  61  and the condensate water discharge fins  70  and  72  having the same structure as that of the first bent part  50  are also formed in the second bent part  60 . A condensate water discharge hole formed in the second bent part  60  is defined as a second condensate water discharge hole  61 . 
     Since the flat tubes  10  are stacked and the fin  20  is disposed between the flat tubes  10 , a condensate water discharge fin  71  formed in the first bent part  50  and a condensate water discharge fin  72  formed in the second bent part  60  are disposed up and down. 
     For convenience of description, a condensate water discharge fin disposed in the first bent part  50  is defined as the first condensate water discharge fin  71 , and a condensate water discharge fin disposed in the second bent part  60  is defined as the second condensate water discharge fin  72 . 
     The first condensate water discharge fin  71  and the second condensate water discharge fin  72  may be disposed up and down. The first condensate water discharge fin  71  and the second condensate water discharge fin  72  formed in a single fin  20  are disposed up and down, but are not vertically disposed. Since the first bent part  50  and the second bent part  60  are arranged in a single fin  20  in the length direction, the first condensate water discharge fin  71  and the second condensate water discharge fin  72  are also arranged in the length direction (left and right direction in the drawing). 
     The first condensate water discharge fin  71  of the first fin  20 - 1  and the second fin  20 - 2  may be arranged in a row with respect to the up and down direction of the first condensate water discharge fin  71 . Furthermore, the second condensate water discharge fin  72  of the first fin  20 - 1  and the second fin  20 - 2  may be arranged in a row with respect to the up and down direction of the second condensate water discharge fin  72 . 
     In the present embodiment, the second bent part  60  of the second fin  20 - 2  is disposed under the first bent part  50  of the first fin  20 - 1 . 
     Referring to  FIG. 2 , the first condensate water discharge fin  71  of the second fin  20 - 2  and the second condensate water discharge fin  72  of the first fin  20 - 1  may be arranged in a row with respect to the up and down direction. 
     The first condensate water discharge fin  71  of the second fin  20 - 2  and the second condensate water discharge fin  72  of the first fin  20 - 1  may come into contact with each other. 
     Furthermore, the first condensate water discharge fin  71  of the second fin  20 - 2  and the second condensate water discharge fin  72  of the first fin  20 - 1  may be spaced apart at a specific interval. The specific interval between the first condensate water discharge fin  71  and the second condensate water discharge fin  72  is a distance in which they can be moved by surface tension of condensate water. 
     In the present embodiment, the first condensate water discharge fin  71  of the second fin  20 - 2  and the second condensate water discharge fin  72  of the first fin  20 - 1  come into contact with each other in the up and down direction. 
     Accordingly, condensate water that has run down to the second condensate water discharge fin  72  of the first fin  20 - 1  may flow to the second fin  20 - 2  along the first condensate water discharge fin  71  of the second fin  20 - 2 . 
     The edge of the flat tube  10  may be closely attached to the condensate water discharge fin  70  and disposed. When the heat exchanger is used as an evaporator, the flat tube  10  has the lowest temperature. Condensate water generated by the flat tube  10  can rapidly move downward through the closely attached condensate water discharge fin  70 . If condensate water rapidly moves as described above, the freezing of the condensate water on a surface of the flat tube  10  can be minimized. 
     In the present embodiment, the condensate water discharge fin  70  and the condensate water discharge holes  51  and  61  are formed only on one side (front side) of the fin  20 . Unlike in the present embodiment, all of the condensate water discharge fin  70  and the condensate water discharge holes  51  and  61  may be formed on both sides (front side and rear side) of the fin  20 . 
     Furthermore, in the present embodiment, the condensate water discharge fin  70  and the condensate water discharge holes  51  and  61  are formed by cutting the first bent part  50  and the second bent part  60 . Unlike in the present embodiment, however, only the condensate water discharge holes  51  and  61  may be formed. Furthermore, if only the condensate water discharge holes  51  and  61  are formed, a plurality of the condensate water discharge holes  51  and  61  may be formed along the first bent part  50  or the second bent part  60 . 
     A micro channel type heat exchanger according to a second embodiment of the present invention is described with reference to  FIGS. 6 to 9 . 
     For a description, a fin  220  located at the top is defined as a first fin  220 - 1 , a fin  220  located under the first fin  220 - 1  is defined as a second fin  220 - 2 , and a fin  220  located under the second fin  220 - 2  is defined as a third fin  220 - 3 . 
     Unlike in the first embodiment, in the fin  220  according to the present embodiment, condensate water discharge fins  271  and  272  are disposed on the front side and rear side of the flat tube  10 , respectively. 
     The first condensate water discharge fins  271  are disposed on the front side and rear side of the flat tube  10 , respectively. The first condensate water discharge fins  271  are disposed on the front side and rear side of the first bent part  50 , respectively. 
     The second condensate water discharge fins  272  are disposed on the front side and rear side of the flat tube  10 , respectively. The second condensate water discharge fins  272  are disposed on the front side and rear side of the second bent part  60 , respectively. 
     The first condensate water discharge fin  271  and the second condensate water discharge fin  272  disposed in the respective fin  220  are disposed in a row with respect to the up and down direction. The first condensate water discharge fin  271  and the second condensate water discharge fin  272  disposed in different fins  220  are also disposed in a row with respect to the up and down direction. 
     The first condensate water discharge fin  271  and the second condensate water discharge fin  272  may be disposed in a row with the first fin part  30  or the second fin part  40 . In the present embodiment, the first condensate water discharge fin  271  and the second condensate water discharge fin  272  are disposed in a row with the first fin part  30  and disposed on the same vertical plane. 
     If the first condensate water discharge fin  271  and the second condensate water discharge fin  272  are disposed in a row on the same vertical plane, condensate water can move in the shortest distance. Furthermore, since a bend is not formed on the path along which condensate water moves, there is an advantage in that resistance can be minimized. 
     In the present embodiment, first condensate water discharge holes  51  are formed on the front side and rear side of the first bent part  50 , respectively. In the present embodiment, second condensate water discharge holes  61  are formed on the front side and rear side of the second bent part  60 , respectively. 
     The first condensate water discharge holes  51  are disposed on the front side and rear side of the flat tube  10 , respectively. The second condensate water discharge holes  61  are disposed on the front side and rear side of the flat tube  10 , respectively. 
     In the present embodiment, the first condensate water discharge hole  51  is formed by only a single first condensate water discharge fin  271 . In the present embodiment, the second condensate water discharge hole  61  is formed by a single second condensate water discharge fin  272 . 
     Hereinafter, the remaining configuration is the same as that of the first embodiment, and a detailed description thereof is omitted. 
     A micro channel type heat exchanger according to a third embodiment of the present invention is described with reference to  FIGS. 10 to 12 . 
     In the present embodiment, for a description, a fin  320  located at the top is defined as a first fin  320 - 1 , a fin  320  located under the first fin  320 - 1  is defined as a second fin  320 - 2 , and a fin  320  located under the second fin  320 - 2  is defined as a third fin  320 - 3 . 
     Unlike in the second embodiment, the fin  320  according to the present embodiment does not include the configuration of the connection part  52  forming the condensate water discharge hole. 
     Accordingly, the first condensate water discharge hole  51  is formed on the front side of the first bent part  50 , and the front side of the first condensate water discharge hole  51  is open. The first condensate water discharge hole  51  is formed at the rear end of the first bent part  50 , and the rear side of the first condensate water discharge hole  51  is open. If the connection part  52  is not present, resistance with air can be reduced. Furthermore, if the connection part  52  is not present, the forming of condensate water on the connection part  52  can be minimized. 
     Hereinafter, the remaining configuration is the same as that of the second embodiment, and a detailed description thereof is omitted. 
     A micro channel type heat exchanger according to a fourth embodiment of the present invention is described with reference to  FIG. 13 . 
     In the present embodiment, for a description, a fin  420  located at the top is defined as a first fin  420 - 1 , a fin  420  located under the first fin  420 - 1  is defined as a second fin  420 - 2 , and a fin  420  located under the second fin  420 - 2  is defined as a third fin  420 - 3 . 
     The fin  420  according to the present embodiment is different from that of the second embodiment in the arrangement of the condensate water discharge fins  171  and  172  and the shapes of the condensate water discharge holes  51  and  61 . 
     The first condensate water discharge fin  171  is disposed in a row with the first fin part  30 , and the second condensate water discharge fin  172  is disposed in a row with the second fin part  40 . 
     The first condensate water discharge fin  171  comes into contact with the second bent part  60 . Unlike in the present embodiment, the first condensate water discharge fin  171  may come into contact with the second fin part  40 . 
     The second condensate water discharge fin  172  comes into contact with the first bent part  50 . Unlike in the present embodiment, the second condensate water discharge fin  172  may come into contact with the first fin part  30 . 
     The first condensate water discharge fin  171  and the second condensate water discharge fin  172  are disposed to face each other. 
     The configuration of the connection part  52  forming the first condensate water discharge hole  51  in the second embodiment is removed. The configuration of the connection part  52  forming the second condensate water discharge hole  61  in the second embodiment is deleted. 
     Accordingly, the outside of the first condensate water discharge hole  51  and the outside of the second condensate water discharge hole  61  are open. 
     Accordingly, the first condensate water discharge hole  51  is formed on the front side of the first bent part  50 , and the front side of the first condensate water discharge hole  51  is open. The first condensate water discharge hole  51  is formed at the rear end of the first bent part  50 , and the rear side of the first condensate water discharge hole  51  is open. If the connection part  52  is not present, resistance with air can be reduced. Furthermore, if the connection part  52  is not present, the forming of condensate water on the connection part  52  can be minimized. 
     Hereinafter, the remaining configuration is the same as that of the second embodiment, and a detailed description thereof is omitted. 
     A micro channel type heat exchanger according to a fifth embodiment of the present invention is described with reference to  FIG. 14 . 
     Unlike in the first embodiment, in a fin according to the present embodiment, the configuration of the connection part  52  forming the first condensate water discharge hole  51  is removed, and the configuration of the connection part  52  forming the second condensate water discharge hole  61  is also removed. 
     The outside of the first condensate water discharge hole  51  and the outside of the second condensate water discharge hole  61  are open. 
     Accordingly, the first condensate water discharge hole  51  is formed on the front side of the first bent part  50 , and the front side of the first condensate water discharge hole  51  is open. The first condensate water discharge hole  51  is formed at the rear end of the first bent part  50 , and the rear side of the first condensate water discharge hole  51  is open. If the connection part  52  is not present, resistance with air can be reduced. Furthermore, if the connection part  52  is not present, the forming of condensate water on the connection part  52  can be minimized. 
     Hereinafter, the remaining configuration is the same as that of the first embodiment, and a detailed description thereof is omitted. 
     A micro channel type heat exchanger according to a sixth embodiment of the present invention is described with reference to  FIG. 15 . 
     In the present embodiment, for a description, a fin  520  located at the top is defined as a first fin  520 - 1 , a fin  520  located under the first fin  520 - 1  is defined as a second fin  520 - 2 , and a fin  520  located under the second fin  520 - 2  is defined as a third fin  520 - 3 . 
     The fin  520  according to the present embodiment has a wave form different from the shape of the second embodiment. 
     In the second embodiment, a unit wave formed by the first fin part  30 , the first bent part  50 , the second fin part  40  and the second bent part  60  is a square. In contrast, the unit wave of the present embodiment is formed in a wave form. 
     The first fin part  30 , the first bent part  50 , the second fin part  40  and the second bent part  60  may be formed in a curve form. 
     The first bent part  50  and the second bent part  60  may be an arc form, and the first fin part  30  and the second fin part  40  may be a straight line form. 
     The number, form or arrangement of the condensate water discharge fins  571  and  572  formed in the bent parts may be disposed in the form of at least any one of the first to fifth embodiments. 
     The number, form and arrangement of the condensate water discharge holes formed in the bent parts may be disposed in the form of at least any one of the first to fifth embodiments. 
     Hereinafter, the remaining configuration is the same as that of the second embodiment, and a detailed description thereof is omitted. 
     A micro channel type heat exchanger according to a seventh embodiment of the present invention is described with reference to  FIG. 16 . 
     In the present embodiment, for a description, a fin  620  located at the top is defined as a first fin  620 - 1 , a fin  620  located under the first fin  620 - 1  is defined as a second fin  620 - 2 , and a fin  620  located under the second fin  620 - 2  is defined as a third fin  620 - 3 . 
     The fin  620  according to the present embodiment has a wave form different from the shape of the second embodiment. 
     In the second embodiment, a unit wave formed by the first fin part  30 , the first bent part  50 , the second fin part  40  and the second bent part  60  has a square. In contrast, the unit wave of the present embodiment is formed in a trapezoid form. 
     The first fin part  30  and the second fin part  40  may be disposed slantly with respect to a vertical direction. The slope direction of the first fin part  30  and the slope direction of the second fin part  40  may be different. The slope direction of the first fin part  30  and the slope direction of the second fin part  40  may be symmetrical. 
     Meanwhile, the fins  620  may be symmetrically disposed in the up and down direction. 
     For example, the first fin  620 - 1  and the second fin  620 - 2  may be symmetrically disposed with respect to the up and down direction, and the unit wave may also be symmetrically disposed with respect to the up and down direction. Furthermore, the second fin  620 - 2  and the third fin  620 - 3  may be symmetrically disposed with respect to the up and down direction, and the unit wave may also be symmetrically disposed with respect to the up and down direction. 
     The number, form or arrangement of the condensate water discharge fins formed in the bent parts may be disposed in the form of at least any one of the first to fifth embodiments. 
     The number, form and arrangement of the condensate water discharge holes formed in the bent parts may be disposed in the form of at least any one of the first to fifth embodiments. 
     Hereinafter, the remaining configuration is the same as that of the second embodiment, and a detailed description thereof is omitted. 
     A micro channel type heat exchanger according to an eighth embodiment of the present invention is described with reference to  FIG. 17 . 
     In the present embodiment, for a description, a fin  720  located at the top is defined as a first fin  720 - 1 , a fin  720  located under the first fin  720 - 1  is defined as a second fin  720 - 2 , and fin  720  located under the second fin  720 - 2  is defined as a third fin  720 - 3 . 
     The fin  720  according to the present embodiment has a wave form different from the shape of the second embodiment. 
     In the second embodiment, a unit wave formed by the first fin part  30 , the first bent part  50 , the second fin part  40  and the second bent part  60  forms a square. In contrast, the unit wave of the present embodiment is formed in a parallelogram form. 
     The first fin part  30  and the second fin part  40  may be disposed slantly with respect to a vertical direction. The slope direction of the first fin part  30  and the slope direction of the second fin part  40  may be formed in the same direction. 
     Meanwhile, the fins  720  may be symmetrically disposed in the up and down direction. 
     For example, the first fin  620 - 1  and the second fin  620 - 2  may be symmetrically disposed with respect to the up and down direction, and the unit wave may also be symmetrically disposed with respect to the up and down direction. Furthermore, the second fin  620 - 2  and the third fin  620 - 3  may be symmetrically disposed with respect to the up and down direction, and the unit wave may also be symmetrically disposed with respect to the up and down direction. 
     The number, form or arrangement of the condensate water discharge fins formed in the bent parts may be disposed in the form of at least any one of the first to fifth embodiments. 
     The number, form and arrangement of the condensate water discharge holes formed in the bent parts may be disposed in the form of at least any one of the first to fifth embodiments. 
     Hereinafter, the remaining configuration is the same as that of the second embodiment, and a detailed description thereof is omitted. 
       FIG. 18  is a graph showing a change of Wet/Dry ΔP according to the interval between condensate water discharge fins and the protruded length of the condensate water discharge fin according to a third embodiment of the present invention. 
     The interval between the condensate water discharge fins means the interval between the first condensate water discharge fin of a second fin and the second condensate water discharge fin of a first fin. 
     The protruded length of the condensate water discharge fin means a length in which the condensate water discharge fin is protruded from the edge of the flat tube to the outside. In the present embodiment, the protruded length is a length in which the condensate water discharge fin is protruded from the edge of the flat tube to the front side or the rear side. 
     Referring to the graph, the distance between the condensate water discharge fins is preferably is 0 mm or more to 0.5 mm or less. The protruded length of the condensate water discharge fin is preferably is 2 mm or more to 4 mm or less. 
     A micro channel heat exchanger according to a ninth embodiment is described with reference to  FIGS. 19 to 23 . 
     Unlike in the first embodiment, in the micro channel type heat exchanger according to the present embodiment, a first condensate water discharge fin  71  and a second condensate water discharge fin  72  are spaced apart and disposed. 
     The micro channel type heat exchanger according to the present embodiment includes a plurality of flat tubes  10  in which a plurality of flow channels has been formed therein, a fin  20  disposed between the two flat tubes  10  and coupled to two flat tubes  10  to conduct heat, and a first header (not shown) and a second header (not shown) assembled with both ends of the plurality of flat tubes  10  to move a refrigerant. 
     In the micro channel type heat exchange, if a refrigerant is supplied to the first header, the refrigerant passes through the flat tubes  10  and moves to the second header. In contrast, if a refrigerant is supplied to the second header, the refrigerant flows to the first header. 
     The first header and the second header are structures widely known to those skilled in the art, and a detailed description thereof is omitted. 
     The flat tube  10  is formed in a flat shape and has a plurality of flow channels formed therein. The flat tube  10  is formed using a metal material. In the present embodiment, the flat tube is made of an aluminum material. 
     In the present embodiment, the flat tube  10  is horizontally disposed, and the extension direction of the fins  20  is also horizontally disposed. The micro channel type heat exchanger according to the present embodiment has a structure in which the flat tubes  10  and the fins  20  are horizontally disposed to facilitate the discharge of condensate water. 
     Unlike in the present embodiment, the extension direction of the flat tube  10  and the fin  20  may be vertically disposed. 
     The fin  20  is bent in the length direction of the flat tube  10 . Since the fins  20  can be fabricated by a consecutive process according to a fin roll method, there is an advantage in that a fabrication cost is low. 
     The fin  20  is made of a metal material. In the present embodiment, the fin  20  is fabricated using the same aluminum as the flat tube  10 . The fin  20  is for improving heat exchange efficiency by rapidly conducting heat of the flat tube  10 . 
     The fin  20  is disposed between the flat tubes  10 . For a description, a fin  20  located at the top is defined as a first fin  20 - 1 , a fin  20  located under the first fin  20 - 1  is defined as a second fin  20 - 2 , and a fin  20  located under the second fin  20 - 2  is defined as a third fin  20 - 3 . 
     The fin  20  includes a first fin part  30  disposed between two flat tubes  10 , a first bent part  50  bent from the first fin part  30  and coming into contact with any one of the two flat tubes  10 , a second fin part  40  bent from the first bent part  50 , facing the first fin part  30 , and disposed between the two flat tubes  10 , and a second bent part  60  bent from the second fin part  40  and coming into contact with the other of the two flat tubes  10 . 
     For convenience of description, a flat tube  10  coming into contact with the first bent part  50  is defined as a first flat tube  11 , and a flat tube  10  coming into contact with the second bent part  60  is defined as a second flat tube  12 . 
     In the fin  20 , the first fin part  30 , the first bent part  50 , the second fin part  40  and the second bent part  60  are repeatedly formed. 
     The first fin part  30  supports the first flat tube  11  and the second flat tube  12 . 
     The first fin part  30  is orthogonally disposed with respect to the length direction of the first flat tube  11  and the second flat tube  12 . 
     Like the first fin part  30 , the second fin part  40  also supports the first flat tube  11  and the second flat tube  12  and is orthogonally disposed with respect to the length direction of the first flat tube  11  and the second flat tube  12 . 
     The first fin part  30  and the second fin part  40  are spaced apart at a specific distance. A flow space  25  in which air flows is formed between the first fin part  30  and the second fin part  40 . 
     Air for heat exchange passes through the flow space  25  formed between the first fin part  30  and the second fin part  40 . 
     As the interval between the flow spaces  25  formed between the first fin part  30  and the second fin part  40  is narrow, more fin parts can be installed, and thus heat exchange efficiency can be improved. 
     In this case, if the interval between the flow spaces  25  is narrow, condensate water generated when the heat exchanger operates as an evaporator may be attached and fixed to the first fin part  30  and the second fin part  40  by surface tension. In the present embodiment, the interval is formed so that condensate water does not connect the first fin part  30  and the second fin part  40  by surface tension. 
     Condensate water generated in the first fin part  30  and the second fin part  40  runs downward because it comes into contact with air that flows along the flow space  25 . 
     Vents  21  and  22  communicating with a neighbor flow space  25 ′ are formed in at least any one of the first fin part  30  or the second fin part  40 . 
     In the present embodiment, the vents  21  and  22  are formed in both the first fin part  30  and the second fin part  40 . Furthermore, the two vents  21  and  22  are formed in the first fin part  30  and the second fin part  40 . Unlike in the present embodiment, only one vent may be formed in the first fin part  30  and the second fin part  40 . 
     For convenience of description, the vents  21  and  22  are defined as a first vent  21  and a second vent  22 . 
     The vent  21 ,  22  is formed in a hole or slit form. 
     In the present embodiment, the vents  21  and  22  are formed by cutting off the first fin part  30  and the second fin part  40 . 
     A (1-1)-th louver  31  forming the first vent  21  is formed in the first fin part  30 . Furthermore, a (1-2)-th louver  32  forming the second vent  22  is formed in the first fin part  30 . 
     The cut first fin part  30  is bent to form the (1-1)-th louver  31 . The first vent  21  is formed at the position where the (1-1)-th louver  31  is cut off. 
     The (1-2)-th louver  32  is also formed using the same method as the (1-1)-th louver  31 . 
     The louvers  31  and  32  function to guide some of air flowing along the flow space  25  to a neighboring flow space  25 ′. 
     In the present embodiment, the (1-1)-th louver  31  and the (1-2)-th louver  32  are formed to guide air in different directions. 
     For example, if the (1-1)-th louver  31  is formed to guide air from the neighbor flow space  25 ′ to the flow space  25 , the (1-2)-th louver  32  is formed to guide air from the flow space  25  to the neighbor flow space  25 ′. 
     The louver is protruded from the first fin part  30  or the second fin part  40  to the flow space  25  or the neighbor flow space  25 ′. 
     The louver is formed vertically with respect to the length direction of the first flat tube  11  and the second flat tube  12 . 
     A louver formed in the second fin part  40  has the same structure as a louver formed in the first fin part  30 . For convenience of description, the louvers are defined as a (2-1)-th louver  41  and a (2-2)-th louver  42 . 
     The first vent  21  is formed in the second fin part  40  by the (2-1)-th louver  41 , and the second vent  22  is formed in the second fin part  40  by the (2-2)-th louver  42 . 
     Since the (1-1)-th louver  31  and the (1-2)-th louver  32  are formed in opposite directions, the direction in which the fin  20  is disposed may not be considered when the heat exchanger is installed. 
     The first bent part  50  is closely attached to the first flat tube  11  and conducts heat of the first flat tube  11 . 
     In the present embodiment, the first bent part  50  is formed as a plane. 
     In the present embodiment, the first bent part  50  is disposed on the upper side and the second bent part  60  is disposed on the lower side, but the second bent part  60  may be disposed on the upper side and the first bent part  50  may be disposed on the lower side. 
     Condensate water discharge fins  70  and  71  for discharging condensate water of the flow space  25  are formed in the first bent part  50 . 
     The condensate water discharge fin  70  is cut off from the first bent part  50  and then bent. 
     Accordingly, a condensate water discharge hole  51  is formed at the position where the condensate water discharge fin  70  was located in the first bent part  50 . A condensate water discharge hole formed in the first bent part  50  is defined as the first condensate water discharge hole  51 . 
     In the present embodiment, two condensate water discharge fins  70  are formed in the first bent part  50  in such a way as to face each other. Only one condensate water discharge hole  51  is formed. 
     Since two condensate water discharge fins  70  are formed in a limited area, the condensate water discharge fin  70  is fabricated to have a length that is half or less of the width of the first bent part  50 . 
     Furthermore, a connection part  52  connecting the first fin part  30  and the second fin part  40  is formed at the edge of the first bent part  50 . 
     The connection part  52  is a portion left over when the condensate water discharge fin  70  is formed. Accordingly, the connection part  52  is formed to come into contact with the condensate water discharge hole  51 . The connection part  52  improves strength of the fin  20  because it connects the first fin part  30  and the second fin part  40 . 
     Condensate water located in the flow space  25  can be discharged to the outside of the flow space  25  through the condensate water discharge hole  51 . 
     The condensate water discharge fin  70  guides a flow of condensate water when the condensate water is discharged. 
     The condensate water discharge hole  61  and the condensate water discharge fins  70  and  72  having the same structure as the first bent part  50  are also formed in the second bent part  60 . A condensate water discharge hole formed in the second bent part  60  is defined as the second condensate water discharge hole  61 . 
     Since the flat tubes  10  are stacked and the fin  20  is disposed between the flat tubes  10 , the condensate water discharge fin  71  formed in the first bent part  50  and the condensate water discharge fin  72  formed in the second bent part  60  are disposed up and down. 
     For convenience of description, a condensate water discharge fin disposed in the first bent part  50  is defined as the first condensate water discharge fin  71 , and a condensate water discharge fin disposed in the second bent part  60  is defined as the second condensate water discharge fin  72 . 
     The first condensate water discharge fin  71  and the second condensate water discharge fin  72  may be disposed up and down. The first condensate water discharge fin  71  and the second condensate water discharge fin  72  may be arranged in a row. If the first condensate water discharge fin  71  and the second condensate water discharge fin  72  are arranged in a row, the first condensate water discharge fin  71  and the second condensate water discharge fin  72  may be spaced apart at a specific interval. 
     The interval between the first condensate water discharge fin  71  and the second condensate water discharge fin  72  is a distance in which they can be moved by surface tension of condensate water. 
     Accordingly, condensate water generated from the flow space  25  of the fin  20  on the upper side may be discharged to the condensate water discharge hole  61  and may move along the second condensate water discharge fin  72 . Furthermore, the condensate water may flow downward along an adjacent second condensate water discharge fin  72  and first condensate water discharge fin  71 . 
     The flat tube  10  may be closely attached and disposed in the condensate water discharge fin  70 . When the heat exchanger is used as an evaporator, the flat tube  10  has the lowest temperature. Condensate water generated from the flat tube  10  can rapidly move downward through the closely attached condensate water discharge fin  70 . When condensate water rapidly flows as described above, the freezing of the condensate water on a surface of the flat tube  10  can be minimized. 
     In the present embodiment, the condensate water discharge fin  70  and the condensate water discharge holes  51  and  61  are formed only on one side of the fin  20 . Unlike in the present embodiment, the condensate water discharge fin  70  and the condensate water discharge holes  51  and  61  may be formed on both sides of the fin  20 . 
     Furthermore, in the present embodiment, the condensate water discharge fin  70  and the condensate water discharge holes  51  and  61  are formed by cutting off the first bent part  50  and the second bent part  60 . Unlike in the present embodiment, only the condensate water discharge holes  51  and  61  may be formed. Furthermore, if the condensate water discharge holes  51  and  61  are formed, a plurality of the condensate water discharge holes  51  and  61  may be formed along the first bent part  50  or the second bent part  60 . 
     A micro channel type heat exchanger according to a tenth embodiment of the present invention is described with reference to  FIGS. 24 to 27 . 
     In the heat exchanger according to the present embodiment, the location and arrangement structure of the condensate water discharge fin  70  are different from those of the first embodiment. 
     In the fin  120  according to the present embodiment, condensate water discharge fins  170  are formed at the edges of the first bent part  50  on both sides, respectively. In the fin  120 , the condensate water discharge fins  170  are formed at the edges of the second bent part  60  on both sides, respectively. 
     For convenience of description, a condensate water discharge fin disposed in the first bent part  50  is defined as a first condensate water discharge fin  171 , and a condensate water discharge fin disposed in the second bent part  60  is defined as a second condensate water discharge fin  172 . 
     The condensate water discharge holes  51  are formed at the edges of the first bent part  50  on both sides. 
     The condensate water discharge holes  61  are formed at the edges of the second bent part  60  on both sides. 
     Unlike in the first embodiment, a single condensate water discharge fin  170  may be formed in a single condensate water discharge hole  51 ,  61 . 
     The first condensate water discharge fins  171  and the second condensate water discharge fins  172  formed in the fin  120  are disposed up and down in such a way as to go across. That is, unlike in the first embodiment, the first condensate water discharge fins  171  and the second condensate water discharge fins  172  are not disposed in a row. 
     Accordingly, if the fins  120  are stacked, the first condensate water discharge fins  171  and the second condensate water discharge fins  172  are located left and right in such a way as to go across. Specifically, the first condensate water discharge fins  171  and the second condensate water discharge fins  172  are disposed to go across in such a way as to face each other. 
     In the state in which the fins  120  have been stacked, the second condensate water discharge fins  172  of the fin  120  in the upper floor are located to face the first condensate water discharge fins  171  of the fin  120  in the lower floor. 
     In the present embodiment, when the fin  120  is viewed from the front, the first condensate water discharge fins  171  and the second condensate water discharge fins  172  are disposed in a row with. 
     Unlike in the present embodiment, when the fin  120  is viewed from the front, the first condensate water discharge fins  171  may be disposed to go across. The second condensate water discharge fins  172  may also be disposed to go across when they are viewed from the front. 
     Hereinafter, the remaining configuration is the same as that of the first embodiment, and a detailed description thereof is omitted. 
     Although the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the embodiments and may be fabricated in different various forms. A person having ordinary skill in the art to which the present invention pertains may understand that the present invention may be practiced in other detailed forms without changing the technical spirit or essential characteristics of the present invention. Accordingly, the aforementioned embodiments should be understood to be illustrative from all aspects, but to be not limiting.