CFD simulation and optimization of ICEs exhaust heat recovery using different coolants and fin dimensions in heat exchanger

摘要

In this paper, finned type heat exchangers with different fin dimensions in the exhaust of a gasoline engine are modeled numerically for improving the exhaust energy recovery. RNG k-ε viscous model is used and the results are compared with available experimental data presented by Lee and Bae (Int J Therm Sci 47:468-478, 2008) where a good agreement is observed. Also, the effect of fin numbers, fin length and three water-based nanofluid cool-ants (TiO_2, Fe_2O_3 and CuO) on the heat recovery efficiency are investigated in different engine loads. As a main out-come, results show that increasing the fin numbers and using TiO_2-water as cold fluid are the most effective methods for heat recover. Furthermore, an optimization analysis is performed to find the best fins dimensions using response surface methodology.