Abstract
In this work, the steady state energetic performance of selected mass charges (40, 60 and 80 g) of R600a refrigerant and varying concentrations of TiO2 based nano-lubricant (0, 0.2, 0.4 and 0.6 g/L) within a domestic refrigerator was investigated and compared with the performance of a domestic refrigerator using LPG refrigerant from authors’ previous publication. Additionally, the effect of the TiO2 concentrations on the thermo-physical properties of the nano-lubricants under similar conditions was investigated. The results reported compressor discharge temperature, compressor power consumption and pull-down time within the R600a-based refrigerator were lower by about 41.92%, 33.33% and 21.05% respectively compared to the LPG-based refrigerator. Moreover, refrigeration capacity and COP of the R600-based refrigerator were higher when compared to LPG-based refrigerator, by about 17.39% and 62.54% respectively. Overall, energetic performance of the R600a-based domestic refrigerator was better than that of baseline (LPG) at optimal concentration of 0.2 g/L of TiO2 and 40 g charge of R600a refrigerant, under similar operating conditions.
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