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Investigation of heat transfer augmentation and friction factor in triangular duct solar air heater due to forward facing chamfered rectangular ribs: A CFD based analysis

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  • Kumar, Rajneesh
  • Goel, Varun
  • Kumar, Anoop

Abstract

The rib provided over absorber plate can improve the performance of solar air heater (SAH). The effect of forward chamfered ribbed absorber plate is studied in the present article. Two new roughness parameters named as rib aspect ratio (e/w) and rib chamfered height ratio (e′/e) has been defined and their influence on the performance of triangular duct SAH is simulated using commercial ANSYS software for fixed range of Reynolds number (Re) which varies from 4000 to 17000. The e/w, relative roughness height (e/D) and e′/e ranges from 0.24 to 1.5, 0.018 to 0.043 and 0 to 1.0, respectively. The ribbed side of duct is heated with constant heat flux of 1000 Wm-2. The three-dimensional model of SAH is developed for the analysis and results are simulated using finite volume approach. The numerical methodology is validated by comparing predicted results with the available results and a close match is seen between friction factor (f) and Nusselt number (Nu). A remarkable change in f and Nu value is observed by varying both Re and roughness parameters. The maximum increase in Nu is observed in case of e/w, e/D and e′/e value of 1.5, 0.043 and 0.75, respectively, at Re value of 17000 and it is of the order of 2.88. The maximum increase of friction penalty is seen in case of e/D value of 0.043 which is of the order of 3.52 times the without ribbed duct at Re value of 4000. With the help of numerically predicted results, a generalized correlation is developed for Nu and f.

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  • Kumar, Rajneesh & Goel, Varun & Kumar, Anoop, 2018. "Investigation of heat transfer augmentation and friction factor in triangular duct solar air heater due to forward facing chamfered rectangular ribs: A CFD based analysis," Renewable Energy, Elsevier, vol. 115(C), pages 824-835.
    • Handle: RePEc:eee:renene:v:115:y:2018:i:c:p:824-835
    DOI: 10.1016/j.renene.2017.09.010
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    References listed on IDEAS

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    Cited by:

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    2. Varun Kumar B. & G. Manikandan & P. Rajesh Kanna & Dawid Taler & Jan Taler & Marzena Nowak-Ocłoń & Karol Mzyk & Hoong Thiam Toh, 2018. "A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review," Energies, MDPI, vol. 11(11), pages 1-20, November.
    3. Tuncer, Azim Doğuş & Khanlari, Ataollah, 2023. "Improving the performance of a triple-flow solar air collector using recyclable aluminum cans as extended heat transfer surfaces: An energetic, exergetic, economic and environmental survey," Energy, Elsevier, vol. 282(C).
    4. Varun Kumar, B. & Manikandan, G. & Rajesh Kanna, P., 2021. "Enhancement of heat transfer in SAH with polygonal and trapezoidal shape of the rib using CFD," Energy, Elsevier, vol. 234(C).
    5. Choi, Hwiung & Choi, Kwanghwan, 2022. "Parametric study of a novel air-based photovoltaic-thermal collector with a transverse triangular-shaped block," Renewable Energy, Elsevier, vol. 201(P1), pages 96-110.
    6. Kumar, Amit & Akshayveer, & Singh, Ajeet Pratap & Singh, O.P., 2020. "Efficient designs of double-pass curved solar air heaters," Renewable Energy, Elsevier, vol. 160(C), pages 1105-1118.
    7. Khanlari, Ataollah & Tuncer, Azim Doğuş, 2023. "Analysis of an infrared-assisted triple-flow prototype solar drying system with nano-embedded absorber coating: An experimental and numerical study," Renewable Energy, Elsevier, vol. 216(C).
    8. Tuncer, Azim Doğuş & Khanlari, Ataollah & Sözen, Adnan & Gürbüz, Emine Yağız & Şirin, Ceylin & Gungor, Afsin, 2020. "Energy-exergy and enviro-economic survey of solar air heaters with various air channel modifications," Renewable Energy, Elsevier, vol. 160(C), pages 67-85.
    9. Anil Singh Yadav & Tabish Alam & Gaurav Gupta & Rajiv Saxena & Naveen Kumar Gupta & K. Viswanath Allamraju & Rahul Kumar & Neeraj Sharma & Abhishek Sharma & Utkarsh Pandey & Yogesh Agrawal, 2022. "A Numerical Investigation of an Artificially Roughened Solar Air Heater," Energies, MDPI, vol. 15(21), pages 1-27, October.
    10. Das, Biplab & Mondol, Jayanta Deb & Debnath, Suman & Pugsley, Adrian & Smyth, Mervyn & Zacharopoulos, A., 2020. "Effect of the absorber surface roughness on the performance of a solar air collector: An experimental investigation," Renewable Energy, Elsevier, vol. 152(C), pages 567-578.
    11. Jin, Dongxu & Quan, Shenglin & Zuo, Jianguo & Xu, Shiming, 2019. "Numerical investigation of heat transfer enhancement in a solar air heater roughened by multiple V-shaped ribs," Renewable Energy, Elsevier, vol. 134(C), pages 78-88.
    12. Afshari, Faraz & Sözen, Adnan & Khanlari, Ataollah & Tuncer, Azim Doğuş & Şirin, Ceylin, 2020. "Effect of turbulator modifications on the thermal performance of cost-effective alternative solar air heater," Renewable Energy, Elsevier, vol. 158(C), pages 297-310.
    13. Byeong-Hwa An & Kwang-Hwan Choi & Hwi-Ung Choi, 2023. "Heat Transfer Augmentation and Friction Factor Due to the Arrangement of Rectangular Turbulators in a Finned Air Channel of a Solar Air Heater," Energies, MDPI, vol. 16(19), pages 1-18, September.
    14. Nidhul, Kottayat & Kumar, Sachin & Yadav, Ajay Kumar & Anish, S., 2020. "Enhanced thermo-hydraulic performance in a V-ribbed triangular duct solar air heater: CFD and exergy analysis," Energy, Elsevier, vol. 200(C).
    15. Kumar, Rajneesh & Goel, Varun, 2021. "Unconventional solar air heater with triangular flow-passage: A CFD based comparative performance assessment of different cross-sectional rib-roughnesses," Renewable Energy, Elsevier, vol. 172(C), pages 1267-1278.
    16. Choi, Hwi-Ung & Choi, Kwang-Hwan, 2023. "Numerical study on the performance of a solar-assisted heat pump coupled with a photovoltaic-thermal air heater," Energy, Elsevier, vol. 285(C).
    17. Al-Zahrani, Salman, 2023. "Thermal performance augmentation of solar air heater with curved path," Energy, Elsevier, vol. 284(C).
    18. Bezbaruah, Parag Jyoti & Das, Rajat Subhra & Sarkar, Bikash Kumar, 2021. "Experimental and numerical analysis of solar air heater accoutered with modified conical vortex generators in a staggered fashion," Renewable Energy, Elsevier, vol. 180(C), pages 109-131.
    19. Kumar, Rajneesh & Sharma, Akshay & Goel, Varun & Sharma, Rajesh & Sethi, Muneesh & Tyagi, V.V., 2023. "An experimental investigation of new roughness patterns (dimples with alternative protrusions) for the performance enhancement of solar air heater," Renewable Energy, Elsevier, vol. 211(C), pages 964-974.

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