The influence of the compressor oil viscosity and fullerenes C<sub>60</sub> additives in the oil on the energy efficiency of refrigeration compressor system
The analysis of the compressor oil viscosity and fullerenes C<sub>60</sub> additives in the oil on the energy efficiency of refrigeration system with the household refrigeration compressor has been performed. The method of preparation of compressor oil with fullerenes C<sub>60</sub> additives has been considered. The good aggregative stability of the fullerenes C<sub>60</sub> in sample of nano-oil has been obtained. The results of the investigation of the compressor oil and fullerenes concentrations in the working fluid in various units of the compressor system have been presented. The results of the experimental study of the cooling capacity and the compressor power consumption of the refrigeration compressor system with the such working fluids as R600a / compressor oil (ν<sub>40</sub> = 8 cSt), R600a / compressor oil (ν<sub>40</sub> = 19,5 cSt) and R600a / compressor oil (ν<sub>40</sub> = 19,5 cSt) / fullerenes C<sub>60</sub> at different values of working fluid flow rate have been presented. It was shown that the addition of 0.0036 g of C<sub>60</sub> per 1 g of the working fluid does not led to change the cooling capacity of the refrigeration compressor system, but led to decreasing the compressor power consumption and increasing the coefficient of performance. The results of the article demonstrate that the science-based choice of compressor oil viscosity and inclusion the fullerenes in the working fluid are important factors for increasing the efficiency of household refrigerator.