Composition containing refrigerant comprising R32, R125, R143A, R1234YF and R134A, and refrigeration method, refrigerator operating method and refrigerator using said composition

A composition comprising a refrigerant that contains R32, R125, R143a, R1234yf, and R134a,

• the composition comprising one member selected from the group consisting of refrigerant 1, refrigerant 2, and refrigerant 3,
• wherein
• when the total concentration of R32, R125, R143a, R1234yf, and R134a is 100 mass %,
• in a ternary composition diagram in which
• the concentration of R32 is x mass %,
• the ratio r of the R1234yf concentration and the total concentration of R1234yf and R134a is r=100*R1234yf/(R1234yf+R134a), and
• the total concentration of R125, R143a, R1234yf, and R134a is (100-x) mass %, refrigerant 1 has a compositional ratio as follows
• (1)-1 20.0 mass %>x≥17.4 mass %, and 100≥r≥0,
• (1)-2 the concentration (mass %) of R125, the concentration (mass %) of R143a, and the concentration (mass %) of (R1234yf+R134a) fall within a square or triangular region that has the following points as vertices (with the proviso that r=0 or 100 is excluded)
• point A0≤r≤100[−0.0005r2+(−0.0074x+0.2803)r+(0.3692x+51.618)/0/100−R32−R125],
• point B0≤r≤100[0/−0.0005r2+(−0.0049x+0.2751)r+(0.2185x+35.728)/100−R32−R143a],
• point C0≤r≤100[(0.00004x−0.0002)r2+(−0.0131x−0.0403)r+(−2.5154x+89.168)/0/100−R32−R125],
• and
• point D0≤r≤100[0/0.0006r2+(−0.0043x−0.1555)r+(−2.2846x+79.443)/100−R32−R143a];
• refrigerant 2 has a compositional ratio as follows
• (2)-1 22.5 mass %>x≥20.0 mass %, and 100≥r≥0,
• (2)-2 the concentration (mass %) of R125, the concentration (mass %) of R143a, and the concentration (mass %) of (R1234yf+R134a) fall within a square region that has the following points as vertices (with the proviso that r=0 or 100 is excluded)
• point A0≤r≤100[(0.00008x−0.0021)r2+(−0.0118x+0.3686)r+(0.3772x+51.459)/0/100−R32−R125],
• point B0≤r≤100[0/(0.00004x−0.0013)r2+(−0.0066x+0.3086)r+(0.2904x+34.289)/100−R32−R143a],
• point C0≤r≤100[(0.00004x−0.0002)r2+(−0.00148x+0.074)r+(−2.4356x+87.572)/0/100−R32−R125],
• and
• point D0≤r≤100[(0.00008x−0.001)r2+(−0.0087x−0.0681)r+(−2.1632x+77.015)/100−R32−R143a];
• and
• refrigerant 3 has a compositional ratio as follows
• (3)-1 25.0 mass %≥x≥22.5 mass %, and 100≥r≥0,
• (3)-2 the concentration (mass %) of R125, the concentration (mass %) of R143a, and the concentration (mass %) of (R1234yf+R134a) fall within a square region that has the following points as vertices (with the proviso that r=0 or 100 is excluded)
• point A0≤r≤100[−0.0003r2+(−0.006x+0.2381)r+(0.3552x+51.954)/0/100−R32−R125],
• point B0≤r≤100[0/−0.0004r2+(−0.0054x+0.2825)r+(0.2412x+35.396)/100−R32−R143a],
• point C0≤r≤100[0.0007r2+(−0.0116x+0.002)r+(−2.4616x+88.157)/0/100−R32−R125], and
• point D0≤r≤100[0/(0.00004x−0.0001)r2+(−0.0075x−0.0951)r+(−2.1488x+76.691)/100−R32−R143a].