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The use of dimple technology and the use of nanofluids in different heat exchanging systems are known as powerful tools for improving heat transfer and fluid flow conditions. This work aims to prepare a comprehensive thermo-hydraulic parametric study and optimization of CuO/water nanofluid flow inside dimpled heat exchangers. The modeling procedure is based on the combination of the heat and mass transfer, fluid flow characteristics as well as the second law of thermodynamics. The parametric study is done for evaluating three thermo-hydraulic criteria (i.e., entropy generation number, Bejan number and irreversibility distribution ratio) with changing some of the most important fluid conditions (namely Reynolds number, average flow temperature and nanofluid concentration) as well as pitch ratio of the heat exchanger. Finally, the optimization is done through the combination of …