TiO₂, CNTs, and SiO₂ nanolubricant: An approach to improving the efficiency of a domestic refrigerator

To enhance a home refrigerator’s refrigeration system’s performance, three types of nanoparticles (TiO 2 , CNTs, and SiO 2 ) were used to produce nanolubricants. The experiments were conducted with different charges of 50 and 60 g for R600a refrigerants, which a digital charging scale was used to measure. The inlet and exit temperature of the system’s components were measured using K-type thermocouples. The system was outfitted with two pressure gauges for measuring the pressures at suction and discharge. The obtained results show the system’s COP increases with nanolubricant-enhanced refrigerants, with the power of the based lubricant, TiO 2 , CNTs, and SiO 2 nanolubricant being 0.0821, 0.0612, 0.0673, and 0.0702 kW, respectively. Therefore, nano-enhanced refrigerant can successfully replace R600a in the based lubricant in domestic refrigerators.