Abstract
This paper studies the experimental performance of the energetic characteristics of a slightly modified domestic refrigerator infused with nano-lubricant containing different concentrations of Al2O3 (at 0, 0.2, 0.4 and 0.6 g/L) with liquefied petroleum gas (LPG) charge of 40g. Parameters investigated were power consumption, cooling capacity, coefficient of performance (COP), discharge temperature, volumetric refrigerating capacity (VRC) and pressure ratio. The findings showed that when the nano-based lubricants were compared with pure oil, the power at 0.6g/L concentration, gave the best performance of 67.01W, at different time over 180 minutes’ periods. The discharge pressure of the system when compared to pure-oil at 0.6g/L concentrations exhibited acceptable value of 616. 33kPa. For the cabinet temperature, it was seen that the 0.6g/L had the lowest recorded temperature of -8.7°C after 180 minutes. With the coefficient of performance, the 0.2g/L concentration had the highest average performance of 2.239 at 180 minutes. The highest average performance of 174.225 kW over 180 minutes was found as the refrigerating capacity at 02.g/L concentration. The nano-lubricant can be concluded to work safely in the refrigerator but better optimization in nano-application will still be needed for better results.
Highlights
In recent times, the need for energy saving and environmentally friendly refrigeration system is a growing concern [1]
Refrigeration systems are expected to reduce their contribution to climate change, by reducing their global warming contribution and energy consumption, and having the characteristics of zero ozone layer depletion [2]
The flammability of hydrocarbon-based refrigerants is managed and certified safe for household utilizations, provided the refrigerant charge is limited to 150g within the domestic refrigerators [4]
Summary
The need for energy saving and environmentally friendly refrigeration system is a growing concern [1]. Refrigeration systems are expected to reduce their contribution to climate change, by reducing their global warming contribution and energy consumption, and having the characteristics of zero ozone layer depletion [2]. Published under licence by IOP Publishing Ltd. 1378 (2019) 042083 doi:10.1088/1742-6596/1378/4/042083 to the high energy efficiency, neutral reaction to ozone layer and low global warming potential [3]. The flammability of hydrocarbon-based refrigerants is managed and certified safe for household utilizations, provided the refrigerant charge is limited to 150g within the domestic refrigerators [4]
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