Evaluation of a Refrigeration System Based on Nano-Refrigerants and Nano-Lubricants

Abstract

Most of studies reported that disperse nanoparticles into refrigerants and lubricating oils lead to improve a coefficient of performance, due to improvement of thermal physics properties of a pure fluid, which leads to reduced energy consumption. Using nanoparticles in a refrigeration system is associated with many difficulties such as the cost of preparing and obtaining a stable and homogeneous mixture for a longer time with less agglomeration and sedimentation. In this research, nanoparticles were prepared as a mixture in an inexpensive and easy way consisting of copper and cerium oxides for the first time, with suitable average diameter to verify the possibility of overcoming the problem of stability of nanoparticles for a longer time with refrigerant. As most studies focus on improving the thermal properties of a refrigerant by using high thermal conductivity nanoparticles, while this study focuses on improving both of thermal conductivity of refrigerant and stability of nanoparticles with a refrigerant. Some studies have reported on the use of copper oxide and its effect on improving the performance of refrigeration system, but cerium oxide has not been used in refrigeration systems and this research will open the door to cerium oxide as a single material and as a mixture with copper oxide to verify the possibility of this oxide to create greater stability of nanoparticles and improve thermal properties.

Agricultural Waste Valorization for Nanoparticles Synthesis and Enhancement of Vapour Compression Refrigeration System’s Performance

“…Nanorefrigerants are a combination of refrigerants and nanoparticles that are specifically designed for heat transfer purposes. The use of nanorefrigerants/nanolubricants improved system performance and efficiency while lowering energy consumption [9][10][11]. The single-step technique, which involves the simultaneous formation and dispersion of nanoparticles in the base fluid [12], and the two-step technique, which involves the dispersion of the nanoparticles directly in the refrigerant or lubricant [13], are used to prepare nanorefrigerants and nanolubricants.…”

Simulation of vapour compression air conditioning system using Al2O3 based nanofluid refrigerant

“…HudaElsam et al [28] has investigated Cerium Oxide nanoparticle as a single material and as a blend with copper oxide to verify the feasibility of this oxide to increase nanolubricant stability and enhanced thermal characteristics. Pritam and Bijan [29] carried study on the performance enhancement of a shell and tube evaporator using Al 2 O 3 / R600a nanorefrigerant.…”