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study COP of the system working with mineral oil and nanofluid as lubricant are compared. COP is found using the following relation 5. RESULT AND DISCUSSIONS The results obtained in the experiments are thoroughly studied and are discussed in this section. 1. Variation of viscosity Kinematic viscosity of oils under the study is measured using a Redwood viscometer. From the experiment it was found that nanofluid shows higher value of viscosity. The increase in viscosity of the nanofluid is predominant under lower temperature range. The variation of viscosity at different temperatures measured is shown in the graph below. Figure 3. Viscosity variations graph Increase in viscosity for lubricant enhances lubrication effect, because it is more difficult to squeeze higher viscosity lubricants out of the contact zone. Longer squeezing times lead to shorter times for the asperities to come into contact, and to smaller friction coefficients. The friction coefficient for all of nano-oil was less than that of the corresponding raw oil. 2. Evaluation of performance 2.1. Power consumption: The effectiveness of lubricant used can be easily observed from the changes in power consumption of the device. Graph shows the power consumption of the refrigerator over different temperature range from 300C to 60C. Figure 4. Power input variations graph Copyright to IJIRSET www.ijirset.com 836PDF Image | PERFORMANCE ANALYSIS OF NANOFLUID
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