Investigation of hydraulic-thermal performance, energy efficiency and exergy in solar collector equipped with vortex generator containing two-phase hybrid nanofluid

Document Type : Original Article

Authors

1 Department of Mechanical Engineering, Arak Branch, Islamic Azad University, Arak, Iran

2 Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran

3 Department of Chemical Engineering, Arak Branch, Islamic Azad University, Arak, Iran

10.22052/eem.2024.253947.1039

Abstract

The sun is non-renewable resource that helps reduce carbon dioxide emissions and reduces the impact of industries on nature pollution. Unlike fossil fuels such as coal and oil, this energy does not directly lead to the release of pollutants in the air and water. In this study, the effects of using the vortex generator in different geometric modes in the absorber tube of the parabolic solar collector are investigated. Also, the nanotube hybrid nanofluid is used as a heat transfer fluid in the solar collector, assuming a two-phase approach in Reynolds numbers of 24,000 to 96,000. Vortex generators are modeled with four geometrical states Case A, Case B, Case C and Case D and their effect on various parameters in the output of the parabolic solar collector is investigated. The obtained results show that the use of vortex generators in the absorber tube of the solar collector causes the hybrid nanofluid flow to undergo deformation and mixing while passing through the path of the absorber tube. This helps in the formation of vortex and fluctuating nature and increases the heat transfer coefficient and as a result increases the thermal efficiency in the parabolic solar collector. Referring to the results of hydraulic-thermal performance coefficient, it can be stated that the presence of vortex generators and their geometrical change is suitable in terms of hydraulic-thermal performance. Because the use of vortex generators has achieved a higher thermal efficiency compared to the pressure drop or friction coefficient in the parabolic solar collector. Increasing the twisting ratio of the vortex generators affects and increases the efficiency and energy efficiency in the parabolic solar collector.

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