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Impacts of storey number of buildings on solar chimney performance: A theoretical and numerical approach

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  • Zhang, Haihua
  • Tao, Yao
  • Zhang, Guomin
  • Li, Jie
  • Setunge, Sujeeva
  • Shi, Long

Abstract

Under the fact that solar chimney was less investigated in multi-storey buildings, a theoretical model was then developed for solar chimney-induced buoyancy-driven natural ventilation. This is the first study addressing the influences of the storey number on ventilation rates for multi-storey solar chimney (SC) buildings. A storey correction coefficient was proposed to predict the SC-induced ventilation at various floors with identical air inlet areas. The theoretical model was established to elucidate the relationship among ventilation flow rates, solar radiation intensity, vent sizes and storey number (f), where the numerical results have also been validated. Although the total SC ventilation performance is enhanced, its enhancement with a higher chimney cavity was less effective when compared to those solar chimneys in single-storey buildings. This is due to the higher chimney cavity hindering the ventilation performance of the lower floors. The volume flow rate decreased exponentially for the top floors of each building when the two-storey building increased to a seven-storey building. For buildings with more than three storeys, the overall volume flow rate was more sensitive to the cavity gap than the solar radiation intensity, with an improvement in ventilation by 45.6% compared to 26.0% under the same conditions, respectively. To maximize the total flow rate, the optimal cavity gap should increase gradually from 0.2 m to 1.5 m for single-to seven-storey buildings. The findings of this study contribute to a further application of solar chimneys in multi-storey buildings.

Suggested Citation

  • Zhang, Haihua & Tao, Yao & Zhang, Guomin & Li, Jie & Setunge, Sujeeva & Shi, Long, 2022. "Impacts of storey number of buildings on solar chimney performance: A theoretical and numerical approach," Energy, Elsevier, vol. 261(PA).
    • Handle: RePEc:eee:energy:v:261:y:2022:i:pa:s0360544222020904
    DOI: 10.1016/j.energy.2022.125200
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    References listed on IDEAS

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