Numerical analysis of heat transfer of a nanofluid counter-flow heat exchanger

Abstract

One of the most significant facts for every economy is energy, regardless of big or small. The need for energy does not expire however it increases day by day, and this brings along the renovation activities. The energy sector is the most effective sector, especially in the climate change problem we have encountered during the recent years. Increasing the thermal capability of heat exchangers in almost every area where there is heating and cooling is very significant in terms of energy efficiency and savings.The numerical analysis of water and nanofluids with water as base fluid in a double-pipe, counter-flow heat exchanger with corrugated tube inside was performed using computational fluid dynamics in this research. The results of a different study were validated by the mathematical method to be utilized in the study. The analyzes we have performed for the heat exchanger we have discussed, the thermal performances of nanofluids obtained with Al2O3, CuO, TiO2 nanoparticles, whose base liquid is water, were analyzed according to different Reynolds numbers, different volumetric concentrations, each other and water.Optimum values were determined by making comparisons of many parameters with each other. It was determined that the use of nanofluid improves heat transfer compared to water, the heat transfer increases based on the increasing nanoparticle volume fraction, the increase in the Reynolds number of the workflow decreases the heat transfer, the increase in the Reynolds number of the refrigerant increases the heat transfer and the highest heat transfer is obtained in the CuO-H2O nanofluid and in heat transfer, and a 23.6% improvement was observed.