Performance evaluation of a vapor-compression refrigeration system with r600a refrigerant and alumina and titanium dioxide hybrid nano-lubricants

In vapor-compression refrigeration system (VCRS), liquid refrigerants are used to absorb heat from space and release it elsewhere. The major drawback of this system is more energy consumption, which can be minimized by introducing the nanoparticles. In this work, the influence of the hybrid Al₂O₃/TiO₂ nanoparticles with R600a refrigerant was experimentally evaluated. Experiments were conducted using 0, 0.2, and 0.4 g L^–1 concentrations of Al₂O₃/TiO₂ hybrid nanoparticles. Coefficient of performance (COP), compressor power consumption, and the cooling effect were evaluated. VCRS that used 0.4 g L^–1 of the hybrid Al₂O₃/TiO₂ nano-refrigerant performed the most effectively with a 25.01% increase in COP, a 20.83% increase in refrigeration effect, and a reduced compressor power requirement. Thus, it was observed that the hybrid Al₂O₃/TiO₂ nanoparticles-loaded refrigerants have high potential to raise the overall COP of the VCRS.