Numerical and experimental analysis of refrigerating performance for hybrid nanolubricants with sepiolite additives
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The use of nanomaterials in various forms and compositions provides the basis for the creation of high-performance structures in their application in many heating and cooling systems. In this study, the lubrication properties of rod-shaped Sepiolite (SP) and its various carbon composites Carbon Black (CB), Multi-Walled Carbon Nanotubes (MWCNT), and reduced Graphene Oxide (rGO) were investigated for the first time in a vapor compression cooling system. The cooling heat transfer performance was compared by analyzing the rheological and thermal behaviors using nanolubricants. The best improvement in cooling Coefficient of Per-formance (COP) was obtained by using SP-rGO nanoparticles. Compared to Polyol Ester (POE), the cooling performance COP increased by 23.6 % with the addition of SP-rGO. The strategy proposed here is simple and has great potential for producing high-efficiency cooling systems. In addition, the single-phase compressor motor was modeled with Finite Element Analysis (FEA) simulation in the experimental studies, and the simulation results were reported. According to the power loss data obtained from FEA simulation results, a total power loss of 119 W is determined as core losses of 44 W, winding losses of 65 W and frictional losses of 10 W for a 1 HP single-phase compressor motor. Thus, the electrical energy efficiency of the motor is approximately 86 %.