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3.EXPERIMENTAL STUDY 1. MEASUREMENT OF VISCOSITY Load carrying capacity and power consumption of machines like compressor depends directly on the viscosity of lubricant oil used. In the case of boundary lubrication system, increasing the viscosity upto an optimum level brings notable reduction in power consumption. Nanoparticle addition must be low so as to be effective in reducing power consumption, else may lead to agglomeration and sedimentation. A Redwood viscometer is used to determine the kinematic viscosity of the oil. The viscosities of mineral oil and nanoparticle-mineral oil mixture were found out at different temperatures using the relation; Kinematic viscosity (in cSt) Where, A= (0.247 above 80s or 0.264 below 80s), B=65, t = redwood seconds. 2. EVALUATION OF POWER CONSUMPTION taken for analysis depends directly on the power loss occurring due to friction in the reciprocating parts of the compressor. The power consumption occurring in compressor is measured using a digital energy meter. Formula for the calculation of power consumption is Where, n = Number of energy meter pulses = 10 k = energy meter constant = 3200 impulse/kWh tm = mean time taken for 10 energy meter pulses. 3. HEAT TRANSFER RATE Heat transfer rate at the evaporator cabin is analysed to study the effect of nanofluids compared to mineral oil. The heat transfer in the evaporator can be found using the following relation m ∗ Cp ∗ ∆θ T C = Specific heat of water = 4.187 kJ/kgK ∆θ = Drop in temperature selected = 3oC T = Time p taken for 3oC the drop in temperature. 4. EVALUATION OF COEFFICIENT OF PERFORMANCE (COP) Performance of a refrigeration system can be effectively compared using the term COP. In this Heat removal rate = Where, m = mass of water in the evaporator cabin = volume used * density of water = 12 L * 1 kg/L = 12 kg kW (3) Copyright to IJIRSET www.ijirset.com 835PDF Image | PERFORMANCE ANALYSIS OF NANOFLUID
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