Nanolubricants with good stability were prepared by modifying graphite nanoparticles with silane coupling agent KH570. A refrigerant test system was built based on the National Standard of China to test and evaluate the performance of a domestic refrigerator using nanolubricants with mass fractions of 0

0.05 and 0.1%. The results show that graphite nanolubricants work normally and safely in the refrigerator. The pull down time

compartment temperatures for storage of fresh food and frozen food

suction pressure

and discharge pressure were reduced to a certain extent. In addition

power consumption of the refrigerator was decreased by 4.55% using graphite nanolubricant with a mass fraction of 0.1%

while freeze capacity was also improved. The effect of energy saving was maintained in an operation for 15 d.