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Induced flow for ventilation and cooling by a solar chimney

Author

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  • Imran, Ahmed Abdulnabi
  • Jalil, Jalal M.
  • Ahmed, Sabah T.

Abstract

An experimental and numerical model of a solar chimney was proposed in order to predict its performance under varying geometrical features in Iraqi environmental conditions. Steady, two dimensional, turbulent flow was developed by natural convection inside an inclined solar chimney. This flow was investigated numerically at inclination angles 15° to 60°, solar heat flux 150–750 W/m2 and chimney thickness (50, 100 and 150) mm. The experimental study was conducted using a single solar chimney installed on the roof of a single room with a volume of 12 m3. The chimney was 2 m long; 2 m wide has three gap thicknesses namely: 50, 100 and 150 mm. The performance of the solar chimney was evaluated by measuring the temperature of its glass cover, the absorbing wall and the temperature and velocity of induced air. The results of numerical model showed that; the optimum chimney inclination angle was 60° to obtain the maximum rate of ventilation. At this inclination angle, the rate of ventilation was about 20% higher than 45°. Highest rate of ventilation induced with the help of solar energy was found to be 30 air changes per hour in a room of 12 m3 volumes, at a solar radiation of 750 W/m2, inclined surface angle of 60°, aspect ratio of 13.3 and chimney length of 2 m. The maximum air velocity was 0.8 m/s for a radiation intensity of 750 W/m2 at an air gap of 50 mm thickness. No reverse air flow circulation was observed even at the largest gap of 150 mm. The induced air stream by solar chimney can be used for ventilation and cooling in a natural way (passive), without any mechanical assistance.

Suggested Citation

  • Imran, Ahmed Abdulnabi & Jalil, Jalal M. & Ahmed, Sabah T., 2015. "Induced flow for ventilation and cooling by a solar chimney," Renewable Energy, Elsevier, vol. 78(C), pages 236-244.
    • Handle: RePEc:eee:renene:v:78:y:2015:i:c:p:236-244
    DOI: 10.1016/j.renene.2015.01.019
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    References listed on IDEAS

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    1. Harris, D.J. & Helwig, N., 2007. "Solar chimney and building ventilation," Applied Energy, Elsevier, vol. 84(2), pages 135-146, February.
    2. Radu Dan Rugescu (ed.), 2012. "Solar Power," Books, IntechOpen, number 1708.
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    Cited by:

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    7. Zhang, Haihua & Yang, Dong & Tam, Vivian W.Y. & Tao, Yao & Zhang, Guomin & Setunge, Sujeeva & Shi, Long, 2021. "A critical review of combined natural ventilation techniques in sustainable buildings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 141(C).
    8. Ning Gao & Yao Yan & Rui Sun & Yonggang Lei, 2022. "Natural Ventilation Enhancement of a Roof Solar Chimney with Wind-Induced Channel," Energies, MDPI, vol. 15(17), pages 1-9, September.
    9. Cheng, Xudong & Shi, Zhicheng & Nguyen, Kate & Zhang, Lihai & Zhou, Yong & Zhang, Guomin & Wang, Jinhui & Shi, Long, 2020. "Solar chimney in tunnel considering energy-saving and fire safety," Energy, Elsevier, vol. 210(C).
    10. Shi, Long, 2018. "Theoretical models for wall solar chimney under cooling and heating modes considering room configuration," Energy, Elsevier, vol. 165(PB), pages 925-938.
    11. Lubomír Klimeš & Pavel Charvát & Jiří Hejčík, 2018. "Comparison of the Energy Conversion Efficiency of a Solar Chimney and a Solar PV-Powered Fan for Ventilation Applications," Energies, MDPI, vol. 11(4), pages 1-15, April.
    12. Ren, Xiu-Hong & Liu, Run-Zhe & Wang, Yun-He & Wang, Lin & Zhao, Fu-Yun, 2019. "Thermal driven natural convective flows inside the solar chimney flush-mounted with discrete heating sources: Reversal and cooperative flow dynamics," Renewable Energy, Elsevier, vol. 138(C), pages 354-367.
    13. Siphiwe Mdlalose & Sipho Sibanda & Tilahun Workneh & Mark Laing, 2022. "Innovative Low-Cost Naturally Ventilated Maize Seed Storage System," Journal of Agriculture and Crops, Academic Research Publishing Group, vol. 8(1), pages 39-49, 01-2022.
    14. Ren, Xiu-Hong & Wang, Lei & Liu, Run-Zhe & Wang, Lin & Zhao, Fu-Yun, 2021. "Thermal stack airflows inside the solar chimney with discrete heat sources: Reversal flow regime defined by chimney inclination and thermal Rayleigh number," Renewable Energy, Elsevier, vol. 163(C), pages 342-356.
    15. Sengupta, Ayan & Mishra, Dipti Prasad & Sarangi, Shailesh Kumar, 2022. "Computational performance analysis of a solar chimney using surface modifications of the absorber plate," Renewable Energy, Elsevier, vol. 185(C), pages 1095-1109.
    16. Ahmad Taghdisi & Yousof Ghanbari & Mohammad Eskandari, 2020. "Energy-Conservation Considerations Through a Novel Integration of Sunspace and Solar Chimney in The Terraced Rural Dwellings," International Journal of Energy Economics and Policy, Econjournals, vol. 10(3), pages 1-13.
    17. Samira Louafi, 2022. "Solar chimney for enhancing thermal comfort in individual housing in a semi-humid climate," Technium Social Sciences Journal, Technium Science, vol. 38(1), pages 818-832, December.
    18. Pau Chung Leng & Mohd Hamdan Ahmad & Dilshan Remaz Ossen & Gabriel H.T. Ling & Samsiah Abdullah & Eeydzah Aminudin & Wai Loan Liew & Weng Howe Chan, 2019. "The Impact of Air Well Geometry in a Malaysian Single Storey Terraced House," Sustainability, MDPI, vol. 11(20), pages 1-35, October.
    19. Shi, Long, 2019. "Impacts of wind on solar chimney performance in a building," Energy, Elsevier, vol. 185(C), pages 55-67.
    20. Chi, Fang'ai & Pan, Jiajie & Liu, Yang & Guo, Yuang, 2021. "Improvement of thermal comfort by hydraulic-driven ventilation device and space partition arrangement towards building energy saving," Applied Energy, Elsevier, vol. 299(C).

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