Air-conditioning indoor unit

Abstract

An air-conditioning indoor unit includes: a casing disposed indoors; a fan disposed inside the casing; a heat exchanger disposed inside the casing and that includes a plurality of flat multi-perforated pipes arranged side by side and one above another; and a drain pan disposed below the heat exchanger. The heat exchanger includes an upper heat-exchange area and a lower heat-exchange area. When the heat exchanger is used as a condenser, a subcooling area subcools a refrigerant flowing in an interior of the heat exchanger. The subcooling area includes one or more of the flat multi-perforated pipes disposed in the lower heat-exchange area. The drain pan includes: a bottom portion that is disposed below the heat exchanger; and a wall that stands on the bottom portion and that is disposed on a downwind side of the heat exchanger.

1 .- 8 . (canceled) 
     
     
         9 . An air-conditioning indoor unit comprising:
 a casing disposed indoors;   a fan disposed inside the casing;   a heat exchanger:
 disposed inside the casing, and 
 that includes a plurality of flat multi-perforated pipes arranged side by side and one above another; and 
   a drain pan disposed below the heat exchanger, wherein   the heat exchanger includes an upper heat-exchange area and a lower heat-exchange area,   when the heat exchanger is used as a condenser, a subcooling area subcools a refrigerant flowing in an interior of the heat exchanger,   the subcooling area comprises one or more of the flat multi-perforated pipes disposed in the lower heat-exchange area,   the drain pan includes:
 a bottom portion that is disposed below the heat exchanger; and 
 a wall portion that stands on the bottom portion and that is disposed on a downwind side of the heat exchanger, and 
   at least a part of the subcooling area is disposed at a position that is lower than an upper end of the wall portion.   
     
     
         10 . The air-conditioning indoor unit according to  claim 9 , wherein
 an area of the upper heat-exchange area is larger than an area of the lower heat-exchange area.   
     
     
         11 . The air-conditioning indoor unit according to  claim 9 , wherein
 at least a part of the subcooling area is disposed at the upper end of the wall portion.   
     
     
         12 . The air-conditioning indoor unit according to  claim 9 , wherein
 at least a part of the subcooling area is disposed above and below the upper end of the wall portion.   
     
     
         13 . The air-conditioning indoor unit according to  claim 9 , wherein
 a blow-out port is disposed in a lower portion of the casing,   the fan is a centrifugal fan, and   the heat exchanger is disposed to surround the centrifugal fan inside the casing.   
     
     
         14 . The air-conditioning indoor unit according to  claim 9 , wherein
 the casing further comprises:
 a blow-out port in a side of the casing; 
 a heat exchanger chamber that communicates with the blow-out port; and 
 a blowing chamber that communicates with the heat exchanger chamber via a partition plate, 
   the heat exchanger is disposed in the heat exchanger chamber, and   the fan is disposed in the blowing chamber.   
     
     
         15 . The air-conditioning indoor unit according to  claim 9 , wherein
 the heat exchanger is a heat exchanger unit that includes a plurality of the heat exchanger.   
     
     
         16 . The air-conditioning indoor unit according to  claim 15 , wherein
 among the plurality of heat exchangers in the heat exchanger unit, a first heat exchanger disposed most downwind from the fan is disposed such that at least a part of a first subcooling area of the first heat exchanger is disposed at a position that is lower than the upper end of the wall portion.