Korniievych S. Investigation of efficiency parameters of compressor system operating with propane/ polyester oil/ fullerene С60 as working fluid

The thesis is devoted to a complex experimental and theoretical investigation of efficiency parameters of a compressor systems running on R290 and the prospects of use of nanotechnology in refrigeration technics. The study of thermal properties of refrigerant/ oil solutions (ROS) and refrigerant/ oil/ fullerene C60 solutions (nanoROS) was performed. The influence of the type of compressor oil (alkylbenzene Reniso SP 46 and polyester ProEco RF 22S) on the parameters of the compressor system, environmental and energy rationale for the use of fullerene C60 additives in the working fluid of steam compression refrigeration equipment was studied. The main idea of the study is that in traditionally used working fluids of steam compression refrigerators fullerene C60 additives contribute to changing their thermophysical properties and energy efficiency without making any changes to the equipment. The stability to clustering of C60 in two nanofluids based on the compressor oils Reniso SP 46 and ProEco RF 22S, which are used in refrigeration systems running on R290, was studied. It is scientifically substantiated and experimentally confirmed that solutions of C60 in oils have a certain saturation concentration, which depends on the type of an oil (its chemical composition). The saturation concentration for Reniso SP 46 is 0,00223 mas.% and for ProEco RF 22S – 0,06837 mas.%. It is also experimentally confirmed that the addition of R290 to solutions of oil/ fullerene C60 does not affect the stability of solutions, and clusters do not form in the entire range of the investigated concentrations of R290 (10...60) % in ROS. Recommendations on the technology of creating real working fluids with the addition of fullerene C60 are developed.