Energy Saving by using Nano-Refrigerant Centered on Thermo-Physical as well as Heat Transfer Properties

Abstract

As a special type of nano fluids, refrigerant-based nano fluids (nano-refrigerants) have been introduced, the potential advantageous of thermal characteristics of nano-refrigerants in refrigeration systems has been reported by scientists. The effect of nanoparticle shape on thermal conductivity of nano-refrigerants has been studied for spherical and cubic shape ZnO nanoparticles loaded R-134a refrigerant by the previous researchers. In the present work the next step of the study has been carried out i.e. finding out the performance of spherical and cubic shape ZnO nanoparticles loaded R-134a refrigerant for the air cooled condenser using the numerical analysis. The CFD analysis has been carried out for three refrigerant R134a,cubic and spherical shape ZnO/R-134a refrigerant for three different inlet temperature 310Kelvin, 315Kelvin and 320Kelvin respectively at constant cold and hot fluid mass flow rate. Results indicates that in all condition the overall heat transfer coefficient is maximum for R134a cubic shape ZnO/R-134a Nano-refrigerant and it is reduces following the R134a spherical shape ZnO/R-134a Nano-refrigerant and at last the R134a refrigerant. The maximum cooling can be achieved by using R134a cubic shape ZnO/R-134a Nano-refrigerant.