Indoor unit of air-conditioning apparatus and air-conditioning apparatus

Abstract

An indoor unit includes a casing having a suction port formed on an upper portion and a blow-out port on a lower side of a front surface portion, an axial-flow or mixed-flow fan provided on the downstream side of the suction port in the casing, and a heat exchanger provided in the casing at a position on the downstream side of the fan and on the upstream side of the blow-out port. The heat exchanger includes a plurality of fins arranged side by side with predetermined gaps therebetween and a plurality of heat-transfer tubes penetrating through the plurality of fins. The heat exchanger is configured in such a manner that the air-flow resistance of an area facing the outer peripheral side of the fan is larger than the air-flow resistance of an area facing a center portion of the fan.

1 . An indoor unit of an air-conditioning apparatus comprising:
 a casing having a suction port formed on an upper portion and a blow-out port formed on a lower side of a front surface portion;   an axial-flow or mixed-flow fan provided on the downstream side of the suction port in the casing; and   a heat exchanger provided in the casing at a position on the downstream side of the fan and on the upstream side of the blow-out port, wherein   the heat exchanger includes a plurality of fins arranged side by side with predetermined gaps therebetween and a plurality of heat-transfer tubes penetrating through the plurality of fins, and an air-flow resistance of an area facing the outer peripheral side of the fan is larger than an air-flow resistance of an area facing a center portion of the fan.   
     
     
         2 . The indoor unit of the air-conditioning apparatus of  claim 1 , wherein the diameter of the heat-transfer tubes of the heat exchanger arranged in the area facing the outer peripheral side of the fan is larger than the diameter of the heat-transfer tubes arranged in the area facing the center portion of the fan. 
     
     
         3 . The indoor unit of the air-conditioning apparatus of  claim 1 , wherein the distance between the adjacent heat-transfer tubes of the heat exchanger arranged in the area facing the outer peripheral side of the fan is smaller than those arranged in the area facing the center portion of the fan. 
     
     
         4 . The indoor unit of the air-conditioning apparatus of  claim 1 , wherein R32 is used as a refrigerant. 
     
     
         5 . The indoor unit of the air-conditioning apparatus of  claim 4 , wherein the heat-transfer tube is a circular tube having a diameter in a range from 3 mm to 7 mm. 
     
     
         6 . The indoor unit of the air-conditioning apparatus of  claim 4 , wherein the heat-transfer tube is a flat tube. 
     
     
         7 . An indoor unit of an air-conditioning apparatus comprising:
 a casing having a suction port formed on an upper portion and a blow-out port formed on a lower side of a front surface portion;   an axial-flow or mixed-flow fan provided on the downstream side of the suction port in the casing; and   a heat exchanger provided in the casing at a position on the downstream side of the fan and on the upstream side of the blow-out port, wherein   the heat exchanger includes a plurality of fins arranged side by side with predetermined gaps therebetween and a plurality of heat-transfer tubes penetrating through the plurality of fins,   the plurality of heat-transfer tubes are circular tubes having a diameter in a range from 3 mm to 7 mm, and   R32 is used as a refrigerant.   
     
     
         8 . An indoor unit of an air-conditioning apparatus comprising:
 a casing having a suction port formed on an upper portion and a blow-out port formed on a lower side of a front surface portion;   an axial-flow or mixed-flow fan provided on the downstream side of the suction port in the casing; and   a heat exchanger provided in the casing at a position on the downstream side of the fan and on the upstream side of the blow-out port, wherein   the heat exchanger includes a plurality of fins arranged side by side with predetermined gaps therebetween and a plurality of heat-transfer tubes penetrating through the plurality of fins;   the plurality of heat-transfer tubes are flat tubes, and   R32 is used as a refrigerant.   
     
     
         9 . The indoor unit of the air-conditioning apparatus of  claim 6 , wherein the heat exchanger is arranged so that the long sides of the heat-transfer tubes agree with the directions of air flow. 
     
     
         10 . The indoor unit of the air-conditioning apparatus of  claim 1 , wherein the heat-transfer tubes and the fins are formed of aluminum or aluminum alloy. 
     
     
         11 . An air-conditioning unit comprising the indoor unit of  claim 1 .