Air-conditioning apparatus

Abstract

An air-conditioning apparatus includes a refrigerant circuit configured to cause refrigerant to circulate therein, and an outdoor unit and an indoor unit forming the refrigerant circuit. The outdoor unit includes a heat exchanger provided with one heat exchanger core or two or more heat exchanger cores arranged along a flow direction of air. Each heat exchanger core has a plurality of flat tubes extending in an up-down direction. The heat exchanger is configured to cause the refrigerant to flow as an upward flow in the flat tubes when functioning as a condenser. The refrigerant is a two-component refrigerant mixture in which two refrigerants selected from R32, HFO1123, and R1234yf are mixed, or a three-component refrigerant mixture in which the three refrigerants are mixed.

1 - 10 . (canceled) 
     
     
         11 . An air-conditioning apparatus comprising:
 a refrigerant circuit configured to cause refrigerant to circulate therein; and   an outdoor unit and an indoor unit forming the refrigerant circuit,   wherein the outdoor unit includes a heat exchanger provided with one heat exchanger core or two or more heat exchanger cores arranged along a flow direction of air, each heat exchanger core having a plurality of flat tubes extending in an up-down direction, and configured to cause the refrigerant to flow as an upward flow in the flat tubes when functioning as a condenser,   the refrigerant is a two-component refrigerant mixture in which two refrigerants selected from R32, HFO1123, and R1234yf are mixed, or a three-component refrigerant mixture in which the three refrigerants are mixed, and   the heat exchanger is configured to satisfy a condition ΔP HEX /ΔP HEAD =A −1.75 /(−4.9056×L 2 +15.53×L−0.6204)×Y>100[%] (or 1), where Y represents a refrigerant pressure drop multiplication factor for a refrigerant R410A, and A [m 2 ] represents a total flow passage cross-sectional area of the heat exchanger core in which a hot gas refrigerant flows as an upward flow when the heat exchanger functions as a condenser and is obtained by a formula A [m 2 ]=a [m 2 ]×N [piece], where a [m 2 ] represents a flow passage cross-sectional area of one flat tube, and N [piece] represents a number of the flat tubes that form the heat exchanger core.   
     
     
         12 . The air conditioning apparatus of  claim 11 , wherein
 the refrigerant is a two-component refrigerant mixture of R32 and R1234yf, and   the factor Y is 0.00019x 2 −0.03026x+2.17100.   
     
     
         13 . The air conditioning apparatus of  claim 11 , wherein
 the refrigerant is a three-component refrigerant mixture in which three refrigerants R32, HFO1123, and R1234yf are mixed,   the concentration of R32 is 50 [wt %], and   the factor Y is 0.00002x 2 −0.00467x+1.14905.   
     
     
         14 . The air conditioning apparatus of  claim 11 , wherein
 the refrigerant is a three-component refrigerant mixture in which three refrigerants R32, HFO1123, and R1234yf are mixed,   the concentration of R32 is 40 [wt %], and   the factor Y is 0.00003x 2 −0.00602x+1.27790.   
     
     
         15 . The air conditioning apparatus of  claim 11 , wherein
 the refrigerant is a three-component refrigerant mixture in which three refrigerants R32, HFO1123, and R1234yf are mixed,   the concentration of R32 is 30 [wt %], and   the factor Y is 0.00003x 2 −0.00751x+1.44400.   
     
     
         16 . The air conditioning apparatus of  claim 11 , wherein
 the refrigerant is a three-component refrigerant mixture in which three refrigerants R32, HFO1123, and R1234yf are mixed,   the concentration of R32 is 20 [wt %], and   the factor Y is 0.00005x 2 −0.01056x+1.66882.   
     
     
         17 . The air conditioning apparatus of  claim 11 , wherein
 the refrigerant is a three-component refrigerant mixture in which three refrigerants R32, HFO1123, and R1234yf are mixed,   the concentration of R32 is 10 [wt %], and   the factor Y is 0.00006x 2 −0.01342x+1.94049.