Khlieva O. Scientific justification of enhancing the refrigeration systems perfor-mance by nanofluids application.

Experimental investigations of the colloidal stability of model nanofluids and nanofluids considered as coolants and working fluids were performed. Recommendations on preparation methods for working fluids of vapor compression refrigeration systems with nanoparticles TiO2, Al2O3 and fullerenes C60 additives have been developed. Generalization and analysis of experimental data on thermophysical properties of the nanofluids of isopropanol/Al2O3 nanoparticles, R141b/surfactants/TiO2 nanoparticles, te-tralin/fullerenes C60, R600a/compressor oil/fullerenes C60 have been performed. It was shown that the presence of the nanoparticles Al2O3 led to decrease in specific isobaric heat capacity of base fluid isopropanol that not predict within additivity rule. The main reason for the presence of the excess heat capacity in nanofluid is the existing structured layer of base fluid molecules around the nanoparticles (surface phase). The method of calcu-lating the concentration of base fluid molecules in the surface phase has been proposed.