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Experimental Investigation of the use of Nano-Lubricants Prepared in Different Al2O3 Nanoparticle Concentrations in a Cooling System

In this experimental study, the results of using a nano-lubricant instead of compressor oil in a cooling system were examined. In the cooling system used in the study, together with the R134a refrigerant, POE (polyol ester) oil was used as a base fluid, and a nano-lubricant prepared from AL2O3 nanoparticles was utilized. The experiments were carried out separately with nano-lubricants created by mixing AL2O3 nanoparticles in the ratios of 0.5% and 1% into POE oil. Additionally, 0.5% Triton X100 (TX-100) surfactant was used in the nano-lubricant in order to provide a homogeneous distribution in the nanofiber. As a result of the experiments, the highest COP value for the cooling system was obtained at the concentrations of 0.5% AL2O3 and 0.5% TX-100. In the experiments with pure POE oil, the COP value was increased by 18.27%. The power value drawn by the compressor was reduced by 12.53% at the concentrations of 0.5% AL2O3 and 0.5% TX-100.