STUDY ON PERFORMANCE OF SOLAR CHIMNEY USED IN  URBAN TUNNEL VENTILATION AND SMOKE EXHAUST

Lu Ning; Tan Zeyu; Liu Xi; Huang Youbo

doi:10.19912/j.0254-0096.tynxb.2023-0576

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (4) : 546-553. DOI: 10.19912/j.0254-0096.tynxb.2023-0576

STUDY ON PERFORMANCE OF SOLAR CHIMNEY USED IN URBAN TUNNEL VENTILATION AND SMOKE EXHAUST

Lu Ning, Tan Zeyu, Liu Xi, Huang Youbo

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Abstract

To investigate the efficiency of solar chimney for natural ventilation and fire smoke extraction in urban tunnels, numerical simulation was used to study the effect of chimney height, cavity clearance, solar radiation intensity and fire power on the ventilation and smoke extraction efficiency. The study results show that the natural ventilation rate of the tunnel increases with the increase of chimney height, cavity clearance and solar radiation intensity, and the ventilation rate increases by 17% for every 1.4 m increase in chimney height, 16% for every 0.5 m increase in cavity clearance, and 11% for every 200 W/m² increase in solar radiation intensity. The efficiency of the solar chimney for smoke exhaust is better than that of the traditional shaft, and the effect of chimney height on the efficiency of smoke exhaust is smaller, and the critical value of the cavity clearance for smoke exhaust is 1.5 m. Based on the transverse asymmetric parabolic temperature distribution inside the solar chimney, a prediction model for the volume flow rate at the exit of the chimney is proposed.

Key words

solar chimneys / urban tunnels / natural ventilation / fire smoke extraction / renewable energy

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Lu Ning, Tan Zeyu, Liu Xi, Huang Youbo. STUDY ON PERFORMANCE OF SOLAR CHIMNEY USED IN URBAN TUNNEL VENTILATION AND SMOKE EXHAUST[J]. Acta Energiae Solaris Sinica. 2024, 45(4): 546-553 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0576

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