Performance enhancement and optimization of residential air conditioning system in response to the novel FAl2O3-POE nanolubricant adoption

This paper aims to evaluate residential air conditioning systems' performance enhancement and optimization by adopting a novel functionalized Al2O3 (FAl2O3)–Polyolester (POE) nanolubricant. Comprehensive discussions were conducted on key parameters, including heat absorption, compressor work, cooling capacity, coefficient of (COP), power consumption. Novel FAl2O3 nanoparticles dispersed into the POE lubricant using two-step method. The findings reveal that FAl2O3–POE nanolubricant exhibits superior absorption compared pure POE. Heat decreases with an increased initial refrigerant charge, while capacity improves charge. COP shows increasing trend at all concentrations when operating R32. FAl2O3–POE/R32 demonstrates enhanced range 3.12%–32.26% for COP. results suggest applying R32 can reduce electrical consumption 13.79%–19.35%. central composite design (CCD) offers optimal condition concentration 0.11 vol%, charge 0.442 kg, resulting in 3.982, standard error 0.019, desirability 1.0.