Heat exchange unit

Abstract

A heat exchange unit including: a casing that includes a suction port on a side surface and a blow-out port on a top surface; a fan that faces the blow-out port in the casing and that feeds air into the casing through the suction port and discharges the air from the casing through the blow-out port; and a heat exchanger that is disposed below the fan in the casing and that causes a refrigerant to exchange heat with the air.

1 - 5 . (canceled) 
     
     
         6 . A heat exchange unit comprising:
 a casing comprising a suction port on a side surface and a blow-out port on a top surface;   a fan that faces the blow-out port in the casing, feeds air into the casing through the suction port, and discharges the air from the casing through the blow-out port; and   a heat exchanger disposed below the fan in the casing and that causes a refrigerant to exchange heat with the air, wherein   the heat exchanger includes:
 a header collecting pipe disposed upright; 
 a plurality of flat tubes disposed on top of one another, wherein each of the plurality of flat tubes includes a passage through which the refrigerant flows and one end that is connected to the header collecting pipe; and 
 a plurality of fins each defining a space, between adjoining flat tubes among the plurality of flat tubes, through which the air flows, 
   the plurality of flat tubes is divided into a plurality of heat exchange parts disposed on top of one another,   the header collecting pipe has an internal space partitioned vertically into a plurality of folded communication spaces for the heat exchange parts,   each of the heat exchange parts includes a main heat exchange part and an auxiliary heat exchange part below the main heat exchange part, wherein the main heat exchange part and the auxiliary heat exchange part are connected in series via each of the plurality of folded communication spaces, and   based on air velocity distribution in the heat exchanger, a number of the flat tubes in each of the heat exchange parts disposed on an upper side of the heat exchanger is smaller than a number of the flat tubes in each of the heat exchange parts disposed on a lower side of the heat exchanger.   
     
     
         7 . The heat exchange unit according to  claim 6 , wherein a number of the flat tubes in each of the main heat exchange parts of the heat exchange parts disposed on the upper side of the heat exchanger is smaller than a number of the flat tubes in each of the main heat exchange parts of the heat exchange parts disposed on the lower side of the heat exchanger. 
     
     
         8 . The heat exchange unit according to  claim 6 , wherein
 a number of the flat tubes in a heat exchange part, among the heat exchange parts disposed on the upper side, that is disposed on an uppermost side of the heat exchanger is 0.6 to 0.9 times a value, and   the value is obtained by dividing a total number of the flat tubes in the heat exchanger by a number of all of the heat exchange parts in the heat exchanger.   
     
     
         9 . The heat exchange unit according to  claim 6 , wherein in each of the heat exchange parts, a ratio of a number of the flat tubes in the main heat exchange part to a number of the flat tubes in the auxiliary heat exchange part is 1.5 to 4.5. 
     
     
         10 . The heat exchange unit according to  claim 6 , wherein each of the plurality of fins has fin cut portions disposed at positions corresponding to a boundary between the main heat exchange part and the auxiliary heat exchange part to suppress vertical heat conduction at the boundary.