R134a is the most widely adopted alternative refrigerant in refrigeration equipment, such as domestic refrigerators and air conditioners. On account of the strong chemical polarity of R134a, the traditional mineral oil can be used as lubricant in refrigerating systems with R134a as working fluid. The present work deals with the investigation on a vapour compression refrigeration system with mineral oil and mineral oil with different nanoparticles added to it. The results indicate that refrigeration system with nanolubricant works normally and safely. It is found that power consumption reduces by 15.4% and the coefficient of performance increases by 20% when TiO2 nanolubricant is used instead of SUNISO 3GS