International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 08 | Aug 2025
p-ISSN: 2395-0072
www.irjet.net
Performance Analysis of Domestic Refrigeration Systems Using Al₂O₃– TiO₂ Nanocomposite Lubricants Zeenat Perween1, Adarsh Kumar Patel2 1M.Tech. (ME) Scholar, Department of Mechanical Engineering, Bansal Institute of Engineering & Technology
Lucknow, Uttar Pradesh, India
2Assistant Professor, Department of Mechanical Engineering, Bansal Institute of Engineering & Technology
Lucknow, Uttar Pradesh, India --------------------------------------------------------------------***---------------------------------------------------------------------improving refrigerator efficiency have largely focused on Abstract- The efficiency of domestic refrigeration
optimizing refrigerant composition, heat exchanger design, and compressor technology. However, in recent years, attention has shifted toward lubricant engineering as a viable method to achieve both thermal and tribological improvements in refrigeration systems (Khalid et al., 2022).
systems plays a critical role in reducing household energy consumption and mitigating environmental impacts. This study investigates the effect of aluminum oxide–titanium dioxide (Al₂O₃–TiO₂) nanocomposite lubricants on the performance of a domestic refrigerator using R134a refrigerant. Nanolubricants were prepared by dispersing varying concentrations (0.02–0.1 wt%) of Al₂O₃–TiO₂ nanoparticles in polyol ester (POE) oil via ultrasonication to ensure homogenous dispersion. Experimental tests were conducted on a fully instrumented refrigerator to measure key parameters such as coefficient of performance (COP), power consumption, and evaporator heat transfer rate. Results revealed that at an optimal concentration of 0.05 wt%, the COP improved by 12%, and compressor energy consumption decreased by 7% compared to the baseline system using conventional POE oil. The performance enhancement is attributed to improved thermal conductivity, reduced frictional losses, and superior refrigerant–lubricant miscibility. However, concentrations above 0.1 wt% resulted in diminished performance due to increased viscosity and nanoparticle agglomeration. This study confirms that Al₂O₃–TiO₂ nanocomposite lubricants, when optimized for concentration and stability, can serve as an effective means to enhance refrigeration system efficiency, contributing to energy savings and extended compressor lifespan.
Lubricants in a refrigeration system perform dual roles: they reduce friction and wear in moving compressor parts while also interacting thermodynamically with the refrigerant. The coefficient of performance (COP) of the system is directly influenced by the thermal conductivity, viscosity, and miscibility of the lubricant– refrigerant mixture. Poor heat transfer in the compressor due to low thermal conductivity lubricants leads to reduced efficiency and higher energy consumption. This has prompted researchers to explore the incorporation of nanoparticles into base lubricants, creating nanolubricants that exhibit enhanced thermal and tribological properties (Mahbubul et al., 2018). Among various nanomaterials, aluminum oxide (Al₂O₃) and titanium dioxide (TiO₂) have been widely studied due to their outstanding individual properties. Al₂O₃ possesses high thermal conductivity, chemical stability, and hardness, making it effective for heat transfer enhancement and wear reduction (Sarafraz et al., 2019). TiO₂, on the other hand, offers excellent anti-corrosion behavior, good dispersion stability, and photocatalytic activity, which can help prevent lubricant degradation during operation (Waghmare & Sonawane, 2021). When these two oxides are combined into a nanocomposite, they exhibit synergistic effects—Al₂O₃ accelerates heat conduction, while TiO₂ improves nanoparticle stability and surface compatibility with the base lubricant.
Keywords:
nanolubricants, Al₂O₃–TiO₂, domestic refrigerator, coefficient of performance, energy efficiency, thermal conductivity
1. Introduction Domestic refrigerators are indispensable household appliances, accounting for a significant portion of total residential electricity consumption worldwide. According to the International Energy Agency (IEA, 2022), refrigeration alone constitutes approximately 14– 20% of total household energy use, making performance enhancement a priority for both economic and environmental reasons. Traditional approaches to
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In the context of domestic refrigeration, nanocomposite lubricants present an attractive solution to boost system performance without major mechanical redesigns. Research on Al₂O₃–TiO₂ nanocomposite lubricants in R134a-based refrigeration systems has shown measurable improvements in COP, compressor reliability, and reduction in energy usage (Jwo et al.,
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