The Effect of Roughness in Absorbing Materials on Solar Air Heater Performance
Artificial roughness on the absorber of the solar air heater (SAH) is considered to be the best passive technology for performance improvement. The roughened SAHs perform better in comparison to conventional SAHs under the same operational conditions, with some penalty of higher pumping power requir...
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| Format: | Article |
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MDPI AG
2022-04-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/9/3088 |
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| author | Karmveer Naveen Kumar Gupta Md Irfanul Haque Siddiqui Dan Dobrotă Tabish Alam Masood Ashraf Ali Jamel Orfi |
| author_facet | Karmveer Naveen Kumar Gupta Md Irfanul Haque Siddiqui Dan Dobrotă Tabish Alam Masood Ashraf Ali Jamel Orfi |
| author_sort | Karmveer |
| collection | DOAJ |
| description | Artificial roughness on the absorber of the solar air heater (SAH) is considered to be the best passive technology for performance improvement. The roughened SAHs perform better in comparison to conventional SAHs under the same operational conditions, with some penalty of higher pumping power requirements. Thermo-hydraulic performance, based on effective efficiency, is much more appropriate to design roughened SAH, as it considers both the requirement of pumping power and useful heat gain. The shape, size, and arrangement of artificial roughness are the most important factors for the performance optimization of SAHs. The parameters of artificial roughness and operating parameters, such as the Reynolds number (Re), temperature rise parameter (ΔT/I) and insolation (I) show a combined effect on the performance of SAH. In this case study, various performance parameters of SAH have been evaluated to show the effect of distinct artificial roughness, investigated previously. Therefore, thermal efficiency, thermal efficiency improvement factor (TEIF) and the effective efficiency of various roughened absorbers of SAH have been predicted. As a result, thermal and effective efficiencies strongly depend on the roughness parameter, Re and ΔT/I. Staggered, broken arc hybrid-rib roughness shows a higher value of TEIF, thermal and effective efficiencies consistently among all other distinct roughness geometries for the ascending values of ΔT/I. This roughness shows the maximum value of effective efficiency equals 74.63% at a ΔT/I = 0.01 K·m<sup>2</sup>/W. The unique combination of parameters p/e = 10, e/D<sub>h</sub> = 0.043 and α = 60° are observed for best performance at a ΔT/I higher than 0.00789 K·m<sup>2</sup>/W. |
| first_indexed | 2024-03-10T03:59:19Z |
| format | Article |
| id | doaj.art-463b3c907e224e36912225c3a3959bef |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T03:59:19Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-463b3c907e224e36912225c3a3959bef2023-11-23T08:37:59ZengMDPI AGMaterials1996-19442022-04-01159308810.3390/ma15093088The Effect of Roughness in Absorbing Materials on Solar Air Heater PerformanceKarmveer0Naveen Kumar Gupta1Md Irfanul Haque Siddiqui2Dan Dobrotă3Tabish Alam4Masood Ashraf Ali5Jamel Orfi6Institute of Engineering and Technology, GLA University, Mathura 281406, IndiaInstitute of Engineering and Technology, GLA University, Mathura 281406, IndiaMechanical Engineering Department, College of Engineering, King Saud University, Riyadh 11421, Saudi ArabiaDepartment of Industrial Engineering and Management, Faculty of Engineering, Lucian Blaga University of Sibiu, 550024 Sibiu, RomaniaCSIR-Central Building Research Institute, Roorkee 247667, IndiaDepartment of Industrial Engineering, College of Engineering, Prince Sattam Bin Abdulaziz University, Al-Kharj 16273, Saudi ArabiaMechanical Engineering Department, College of Engineering, King Saud University, Riyadh 11421, Saudi ArabiaArtificial roughness on the absorber of the solar air heater (SAH) is considered to be the best passive technology for performance improvement. The roughened SAHs perform better in comparison to conventional SAHs under the same operational conditions, with some penalty of higher pumping power requirements. Thermo-hydraulic performance, based on effective efficiency, is much more appropriate to design roughened SAH, as it considers both the requirement of pumping power and useful heat gain. The shape, size, and arrangement of artificial roughness are the most important factors for the performance optimization of SAHs. The parameters of artificial roughness and operating parameters, such as the Reynolds number (Re), temperature rise parameter (ΔT/I) and insolation (I) show a combined effect on the performance of SAH. In this case study, various performance parameters of SAH have been evaluated to show the effect of distinct artificial roughness, investigated previously. Therefore, thermal efficiency, thermal efficiency improvement factor (TEIF) and the effective efficiency of various roughened absorbers of SAH have been predicted. As a result, thermal and effective efficiencies strongly depend on the roughness parameter, Re and ΔT/I. Staggered, broken arc hybrid-rib roughness shows a higher value of TEIF, thermal and effective efficiencies consistently among all other distinct roughness geometries for the ascending values of ΔT/I. This roughness shows the maximum value of effective efficiency equals 74.63% at a ΔT/I = 0.01 K·m<sup>2</sup>/W. The unique combination of parameters p/e = 10, e/D<sub>h</sub> = 0.043 and α = 60° are observed for best performance at a ΔT/I higher than 0.00789 K·m<sup>2</sup>/W.https://www.mdpi.com/1996-1944/15/9/3088roughnesssolar air heaterthermal efficiencyNusselt number and effective efficiencyaugmentation |
| spellingShingle | Karmveer Naveen Kumar Gupta Md Irfanul Haque Siddiqui Dan Dobrotă Tabish Alam Masood Ashraf Ali Jamel Orfi The Effect of Roughness in Absorbing Materials on Solar Air Heater Performance Materials roughness solar air heater thermal efficiency Nusselt number and effective efficiency augmentation |
| title | The Effect of Roughness in Absorbing Materials on Solar Air Heater Performance |
| title_full | The Effect of Roughness in Absorbing Materials on Solar Air Heater Performance |
| title_fullStr | The Effect of Roughness in Absorbing Materials on Solar Air Heater Performance |
| title_full_unstemmed | The Effect of Roughness in Absorbing Materials on Solar Air Heater Performance |
| title_short | The Effect of Roughness in Absorbing Materials on Solar Air Heater Performance |
| title_sort | effect of roughness in absorbing materials on solar air heater performance |
| topic | roughness solar air heater thermal efficiency Nusselt number and effective efficiency augmentation |
| url | https://www.mdpi.com/1996-1944/15/9/3088 |
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