Effect of Inclined Angle on Pattern of Free Convective Airflow Inside the Cavity of Parabolic Solar Collectors
In the present paper, the effect of inclination angle on the free convection airflow inside the cavity of compound parabolic collectors and also on the performance of the thermal system is examined. In the analysis, airflow equations for computations of velocity, pressure, and temperature fields and...
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Babol Noshirvani University of Technology
2025-01-01
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| Series: | Iranica Journal of Energy and Environment |
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| Online Access: | https://www.ijee.net/article_189996_fcd588397b1ba8afbc1a52c56881f787.pdf |
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| author | A. Dehghani Rayeni S. A. Gandjalikhan Nassab |
| author_facet | A. Dehghani Rayeni S. A. Gandjalikhan Nassab |
| author_sort | A. Dehghani Rayeni |
| collection | DOAJ |
| description | In the present paper, the effect of inclination angle on the free convection airflow inside the cavity of compound parabolic collectors and also on the performance of the thermal system is examined. In the analysis, airflow equations for computations of velocity, pressure, and temperature fields and the conduction equation for obtaining the glass cover and absorber tube temperatures are solved by the finite element technique using the COMSOL multi-physics. For this purpose, the well-known κ-ε turbulent model is employed with the Reynolds average Navier Stokes scheme. Theoretical findings reveal that the pattern of air-free convection flow and also the temperature distribution are much affected by the collector inclination angle, such that the symmetric bi-cellular air flow at zero inclined angle changes to two non-symmetric recirculated zones at a large value of the till angle. This phenomenon causes a slight increase in thermal efficiency and leads to a more uniform air temperature distribution inside the collector. Numerical findings are validated by comparison with experimental data published in the literature. |
| format | Article |
| id | doaj-art-bb890c0ee7534d0f8d12ee7d2c3497d7 |
| institution | DOAJ |
| issn | 2079-2115 2079-2123 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Babol Noshirvani University of Technology |
| record_format | Article |
| series | Iranica Journal of Energy and Environment |
| spelling | doaj-art-bb890c0ee7534d0f8d12ee7d2c3497d72025-08-20T02:49:12ZengBabol Noshirvani University of TechnologyIranica Journal of Energy and Environment2079-21152079-21232025-01-0116191610.5829/ijee.2025.16.01.02189996Effect of Inclined Angle on Pattern of Free Convective Airflow Inside the Cavity of Parabolic Solar CollectorsA. Dehghani Rayeni0S. A. Gandjalikhan Nassab1Department of Mechanical Engineering, Bam Branch, Islamic Azad University, Bam, IranShahid Bahonar University of Kerman, Kerman, IranIn the present paper, the effect of inclination angle on the free convection airflow inside the cavity of compound parabolic collectors and also on the performance of the thermal system is examined. In the analysis, airflow equations for computations of velocity, pressure, and temperature fields and the conduction equation for obtaining the glass cover and absorber tube temperatures are solved by the finite element technique using the COMSOL multi-physics. For this purpose, the well-known κ-ε turbulent model is employed with the Reynolds average Navier Stokes scheme. Theoretical findings reveal that the pattern of air-free convection flow and also the temperature distribution are much affected by the collector inclination angle, such that the symmetric bi-cellular air flow at zero inclined angle changes to two non-symmetric recirculated zones at a large value of the till angle. This phenomenon causes a slight increase in thermal efficiency and leads to a more uniform air temperature distribution inside the collector. Numerical findings are validated by comparison with experimental data published in the literature.https://www.ijee.net/article_189996_fcd588397b1ba8afbc1a52c56881f787.pdfcfdcompound parabolic collectorinclined anglenatural convection |
| spellingShingle | A. Dehghani Rayeni S. A. Gandjalikhan Nassab Effect of Inclined Angle on Pattern of Free Convective Airflow Inside the Cavity of Parabolic Solar Collectors Iranica Journal of Energy and Environment cfd compound parabolic collector inclined angle natural convection |
| title | Effect of Inclined Angle on Pattern of Free Convective Airflow Inside the Cavity of Parabolic Solar Collectors |
| title_full | Effect of Inclined Angle on Pattern of Free Convective Airflow Inside the Cavity of Parabolic Solar Collectors |
| title_fullStr | Effect of Inclined Angle on Pattern of Free Convective Airflow Inside the Cavity of Parabolic Solar Collectors |
| title_full_unstemmed | Effect of Inclined Angle on Pattern of Free Convective Airflow Inside the Cavity of Parabolic Solar Collectors |
| title_short | Effect of Inclined Angle on Pattern of Free Convective Airflow Inside the Cavity of Parabolic Solar Collectors |
| title_sort | effect of inclined angle on pattern of free convective airflow inside the cavity of parabolic solar collectors |
| topic | cfd compound parabolic collector inclined angle natural convection |
| url | https://www.ijee.net/article_189996_fcd588397b1ba8afbc1a52c56881f787.pdf |
| work_keys_str_mv | AT adehghanirayeni effectofinclinedangleonpatternoffreeconvectiveairflowinsidethecavityofparabolicsolarcollectors AT sagandjalikhannassab effectofinclinedangleonpatternoffreeconvectiveairflowinsidethecavityofparabolicsolarcollectors |