COMPARATIVE STUDY OF ENERGY PERFORMANCE OF R600a/TiO2 AND R600a/MWCNT NANOLUBRICANTS IN A VAPOR COMPRESSION REFRIGERATION SYSTEM

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Abstract
In this paper the MWCNT and TiO2 nanoparticles were dispersed in mineral oil to form nanolubricant (NLc) concentration (0.4g/L) as a substitute to pure mineral lubricant oil in a domestic vapour compression refrigeration system. The temperatures and pressure measuring instruments were connected to the inlet and outlet of the system components to measure the temperatures and pressure at each condition. The measured outputs of the experiment were used in determining the energy performance of the system using Refprop software version 9.0. The result showed that R600a with MWCNT and TiO2 NLc have lower pull-down time, evaporator air temperature, higher COP, cooling capacity with the reduction in power consumption compared to the base lubricant. The COPs of R600a in both MWCNT and TiO2 NLc were higher than the base lubricant. The power consumed by the refrigerator compressor with MWCNT and TiO2 NLc decreases within the range of 0.9% - 25.5% and 6.1% - 18.0% respectively. Therefore MWCNT and TiO2 NLc are potential substitute for the pure mineral oil in domestic refrigerator system