▎ 摘　　要

NOVELTY - A refrigerant contains 0.005-0.15 %mass nanoparticles which are graphene or graphene oxide materials. USE - Refrigerant for increasing efficiency of refrigeration equipment. ADVANTAGE - The refrigerant contains nano-graphene material, so that the thermal conductivity of the refrigerant and the heat exchange of the evaporator are effectively enhanced, and thus improving the performance of the refrigeration equipment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for method for preparing refrigerant for improving efficiency of refrigeration equipment, which involves (i) cooling specific amount of refrigerant in a container to liquid phase to obtain liquid-phase refrigerant, (ii) adding specific amount of nanoparticles to the liquid-phase refrigerant to obtain nanoparticle liquid phase refrigerant, (iii) adding specific amount of dispersant to the nanoparticle liquid-phase refrigerant to obtain mixed refrigerant, where the mass ratio of nanoparticles to the dispersant is 1:(0.1-10), (iv) sealing the container with mixed refrigerant, carrying out ultrasonic oscillation for a predetermined time, and obtaining graphene refrigerant.