Abstract

Thermal conductivity significantly influences heat transfer efficiency. Conventional refrigerants in vapor compression refrigeration systems (VCRS) generally exhibit low thermal conductivity, limiting performance. To enhance heat transfer, researchers have explored the use of nanofluids. This study focuses on evaluating the reliability and performance of a VCRS using R134a refrigerant combined with Polyolester (POE) oil blended with TiO₂ and Al₂O₃ nanoparticles. The aim is to assess how these nano-lubricants influence thermal conductivity and improve overall system efficiency, offering a potential advancement in refrigeration technology. The system’s overall performance analysis were carried out via the cooling capacity tests and energy intake examination. The results demonstrated that the system with nano lubricant achieved low work done in the compressor with better performance in the system. The results also indicate R134a with Tio2 and CuO nano lubricant works normally and safely. The nano lubricants exhibited enhanced properties. The system nano lubricant exhibited considerable augmentation in COP due to significant reduction in power consumption and slight improvement in cooling effect.

Keywords: Thermal conductivity, Heat transfer, Nano fluids, Work done, Vapour compression refrigeration, Nanolubricant, POE oil, COP, R134a refrigerant