Environmental and energy analysis for photovoltaic-thermoelectric solar unit in existence of nanofluid cooling reporting CO2 emission reduction

•To enhance the performance of PVT-TEG, new cooling system was utilized.•New style of turbulator and six confined jets were utilizing in cooling system.•By implementing cooling techniques, the uniformity of TPV improves by79.96 %.•An augmentation in G leads to a rise in ηTot by 7.32 % for cases 3.•The rise of ηTot with using new design enhances by 24.62 % with the rise of G.