Abstract
ABSTRACT This article examined the energetic and exergetic performance evaluations of a computerized refrigeration cycle test rig for different concentrations of (CuO-Al2O3/MO) hybrid nano-lubricants and R600a refrigerant mass charges. In this particular investigation, three different refrigerant mass charges of 80 g, 100 g, and 120 g were employed, together with four different hybrid nano-lubricant concentrations of 0.1 g/L, 0.2 g/L, 0.3 g/L, and 0.4 g/L. A number of significant parameters, including COP, compressor power consumption (W), refrigerator pull-down time (minutes), second law efficiency (%), and total exergy destruction (W) of mineral oil without nanoparticles and nano-doped mineral oil using (CuO/Al2O3) hybrid nanoparticles as the lubricant, were examined in the course of this investigation. The optimum condition is achieved at 0.2 g/L of (CuO-Al2O3/MO) with 100 g mass of R600a refrigerant. At optimal conditions (0.2 g/L concentration of hybrid nano-lubricant and 80 g refrigerant mass charge), compressor work and total exergy destruction are lowered by (2.20–23.53%) and (4.51–49.00%), respectively. It is also observed that at optimum condition COP and second law efficiency grew within the range of (0.93–28.97%) and (3.38 to 25.42%), respectively. In conclusion, the performance of the computerized refrigeration cycle test rig altered with (CuO-Al2O3/MO) hybrid nano-lubricant concentrations and R600a refrigerant charges.
Published Version
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