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A notable reduction of 9.33% of average compressor power consumption was observed. 2.2. Heat transfer rate: Efficient heat transfer is an essential property of lubricant for dissipating away the heat generated in machine parts lubricated. Also in the case of refrigerator compressor used for the study here lubricant gets mixed with the refrigerant and is pumped to the lines. The oil with lower thermal conductivity remains as an insulating layer hindering the heat transfer. On using nanofluid with high thermal conductivity more effective heat transfer occurs. Variation of heat transfer in the evaporator with the use of both mineral oil and nanofluid is given in the graph shown below. Readings over temperature range from 300C to 60C. Figure 5. Variations of heat transfer with temperature An increase of 5.17% in average heat transfer in the evaporator cabin was observed. Coefficient of performance: Hence due to the enhancement in heat transfer and also reduction in compressor work, average COP found to increase from 1.429 to 1.66, i.e, 16.08% improvement in the performance of the system under study was observed. The improvement in performance can be explained by the following, in 2007, Y.Y. Wu.et.al. [4] found the friction coefficients of lubricating oil containing nanoparticles found to be lower. Friction factor of lubricating oil is one of the main factors deciding the energy consumption. Viscosity of lubricating oil and friction factor are inversely related. As we have found that viscosity of oil found to increase with addition of nanoparticles. Therefore, we conclude about the phenomenon of decrease in friction factor. Also increase in thermal conductivity found to be one of the vital factors causing the improvement in performance of lubricant. The dispersion of TiO2 particles in lubricant causes increase in thermal conductivity of the fluid. Key mechanism for enhanced thermal conductivity is due to Brownian motion. This occurs through micro-convection, where high interaction in between the nanoparticles and base fluid molecules. And the smaller nanoparticles have higher surface area and number of interaction and it leads to more enhanced thermal conductivity of nanofluid. Z.S. Hu et al. [5] proposed that nanoparticles adsorbed on wear scar surface at first, which then form an amorphous film due to the shearing effect. This effect helps to increase the load carrying capacity of the lubricating oil compared to pure mineral oil. The formation of the anti-wear film causes a reduction in the frictional power loss due to reduction in the friction between the contact surfaces. Copyright to IJIRSET www.ijirset.com 837PDF Image | PERFORMANCE ANALYSIS OF NANOFLUID
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