Exergy and energy investigations of ET-150 PTSC with non-Newtonian nanofluid

•The exergy efficiency has a maximum value (=0.216) for the last absorber tube.•The energy efficiency for the first absorber tube has the highest values (=0.8).•The CO2 emission price decreases by 10.28 % for nanofluid.•The sixth absorber tube is most affected by the wind speed. This paper investigates the performance of the EuroTrogh-150 solar collector. The analyzes of energy, exergy, environmental, enviroeconomic, exergoenvironmental and exergoenviroeconomic are considered. For the first time, this study examines these analyzes in several absorber tubes of EuroTrough-150 collector (absorber tubes are installed in series) and for non-Newtonian nanofluid (water-CMC/TiO2). According to the results, energy efficiency, Nusselt number and Thermal Hydrodynamic Efficiency for the first absorber tube have the highest values, and are equal to 0.8, 161.88, and 2.47, respectively. The exergy efficiency has a maximum value for the last absorber tube, and is equal to 0.216. At Re = 5000, increasing the wind speed from 1 m/s to 21 m/s decrease the energy and exergy efficiencies by 8.8 % and 18.3 %, respectively. At Re = 17500 (compared to Re = 5000), the exergy efficiency increase is equal to 50 % and 32 % in the last and first absorber tubes, respectively. In addition, the sixth absorber tube is more affected by the wind speed than the first absorber tube. According to enviroeconomic and exergoenviroeconomic analyses, the price of CO2 emission for nanofluid decreases by 10.28 % and 9.09 %, respectively. Moreover, based on the environmental and exergoenvironmental analyses, the base fluid emits more CO2 than the nanofluid.