摘要：Refrigeration systems have experienced massive technological changes in the past 50 years. Nanotechnology can lead to a promising technological leap in the refrigeration industry. Nano-refrigerant still remains unknown because of the complexity of the phase change process of the mixture including refrigerant, lubricant, and nanoparticle. In this study, the stability of Al<sub>2</sub>O<sub>3</sub> nanofluid and the performance of a nano-refrigerant-based domestic refrigerator have been experimentally investigated, with the focus on the thermodynamic and energy approaches. It was found that by increasing the nanoparticle concentration, the stability of nano-lubricant was decreased and evaporator temperature gradient was increased. The average of the temperature gradient increment in the evaporator was 20.2% in case of using 0.1%-Al<sub>2</sub>O<sub>3</sub>. The results showed that the energy consumption of the refrigerator reduced around 2.69% when 0.1%-Al<sub>2</sub>O<sub>3</sub> nanoparticle was added to the system.
