An empirical model to predict the performance of typical solar chimneys considering both room and cavity configurations

Shi, Long; Zhang, Kevin

doi:10.1016/j.buildenv.2016.04.024

Cited by 67 publications

(10 citation statements)

References 36 publications

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“…Each scenario with a simulation time of 900 seconds is enough to allow the full development of the smoke in the tunnel, while the ambient temperature is set at 20°C and the pressure at 101.325 kPa. More details on the numerical methodology of FDS can refer to previous studies …”

Section: Numerical Methodologymentioning

confidence: 99%

Critical ventilation velocity under the blockage of different metro train in a long metro tunnel

Zhang

Shi

et al. 2020

Fire and Materials

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To address the effect of metro train blockage on the critical ventilation velocity in a long tunnel, a series of scenarios were conducted numerically through this study, including different fire sizes (5-10 MW), metro train lengths (80-120 m), and blockage ratios (φ, 0.50, and 0.57). It is known from the numerical results that the metro train length shows a limited effect on the critical ventilation velocity, which is because the longitudinal ventilation has become stable before reaching the fire source to prevent smoke back-layering, and increasing the metro train length only increases the distance of stabilizing the longitudinal ventilation. The blockage ratio shows an obvious influence on the critical ventilation velocity, which is because the presence of the metro train can obviously reduce the flow cross-sectional area of the tunnel. An empirical model is developed as well, while it is known that the critical ventilation velocity increases with the one-third power of dimensionless heat release rate and (1-φ). The research outcomes of this study provide a technical guide for the design of the metro tunnel and the relevant emergency management of fire rescue under fire conditions. K E Y W O R D S blockage ratio, critical velocity, FDS, metro train, subway tunnel 1 | INTRODUCTION An increasing number of metro systems have been designed and constructed recently to release the urgent issues of accelerated urbanization and growing population in metropolises. The companied fire risk is always an important and hot research topic from both the academia and industries. Consequence and impact of the relevant fire accidents are very high, which can be proved by the large number of fire casualties and very bad influence in the past few decades, such as the Daegu metro fire in South Korea, the Viamala tunnel fire in Switzerland, and the Burnley tunnel fire in Austria. [1][2][3][4] To benefit with the fire safety of those metro systems, smoke movement is an inevitable aspect during the design as it is the most fatal factor of a tunnel fire. 5-7 Therefore, how to control the smoke movement effectively to provide a safe zone for the occupants and firefighters during the evacuation and rescuing processes, respectively, becomes an important question that needs to be answered urgently.It is indicated that the metro train fails to reach the next station and stops between the two stations in about 50% of fires. 8,9 When a fire occurs in the metro tunnel, the relevant ventilation facilities in the adjacent stations will be started, where longitudinal ventilation is triggered, which not only can prevent the smoke from spreading to the upstream and also offer a safe zone without smoke for both occupants and firefighters. If the designed longitudinal ventilation velocity is smaller than the critical value, the smoke released from the fire can break through the barrier raised by the longitudinal ventilation and then threaten the people upstream.Many studies have been undertaken in identifying the appropriate longitudinal ventilation v...

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Section: Numerical Methodologymentioning

confidence: 99%

Critical ventilation velocity under the blockage of different metro train in a long metro tunnel

Zhang

Shi

et al. 2020

Fire and Materials

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“…Referring to the parameterization studies on the various aspects mentioned in Section 2, researchers verified the influence of control parameters on the performance of independent solar chimneys and extended the solar chimney practice to the field of fire prevention and smoke control. Shi et al [48,49] developed empirical models to predict the airflow rate through the air inlets under natural ventilation and smoke exhaustion. The effect of interaction mechanisms between the air inlet and the room window on the performance of the solar chimney was investigated.…”

Section: Work Have Been Done At Rmit University Australiamentioning

confidence: 99%

“…Through different research methods, Dr. Shi has made significant contributions to solar chimney research and promotion. Shi et al [48] conducted the parametric analysis considering installation methods, room/chimney configuration, and cavity materials, thus Through different research methods, Dr. Shi has made significant contributions to solar chimney research and promotion. Shi et al [48] conducted the parametric analysis considering installation methods, room/chimney configuration, and cavity materials, thus developing the empirical models with the assistance of a fire dynamics simulator (FDS) to predict typical solar chimney performance.…”

Section: Work Have Been Done At Rmit University Australiamentioning

confidence: 99%

“…Shi et al [48] conducted the parametric analysis considering installation methods, room/chimney configuration, and cavity materials, thus Through different research methods, Dr. Shi has made significant contributions to solar chimney research and promotion. Shi et al [48] conducted the parametric analysis considering installation methods, room/chimney configuration, and cavity materials, thus developing the empirical models with the assistance of a fire dynamics simulator (FDS) to predict typical solar chimney performance. In another study, aiming at roof solar chimney, Shi et al [19] not only summarized the previous mathematical models, the input parameters of testing ranges, and their experimental tests but also established the empirical models based on the experimental data of various general test rigs to predict the flow rate of rooftop solar chimneys and pointed out the configuration parameter values required to enhance ventilation rate.…”

Section: Work Have Been Done At Rmit University Australiamentioning

confidence: 99%

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Solar Chimney Applications in Buildings

2021

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A solar chimney is a renewable energy system used to enhance the natural ventilation in a building based on solar and wind energy. It is one of the most representative solar-assisted passive ventilation systems attached to the building envelope. It performs exceptionally in enhancing natural ventilation and improving thermal comfort under certain climate conditions. The ventilation enhancement of solar chimneys has been widely studied numerically and experimentally. The assessment of solar chimney systems based on buoyancy ventilation relies heavily on the natural environment, experimental environment, and performance prediction methods, bringing great difficulties to quantitative analysis and parameterization research. With the increase in volume and complexity of modern building structures, current studies of solar chimneys have not yet obtained a unified design strategy and corresponding guidance. Meanwhile, combining a solar chimney with other passive ventilation systems has attracted much attention. The solar chimney-based integrated passive-assisted ventilation systems prolong the service life of an independent system and strengthen the ventilation ability for indoor cooling and heating. However, the progress is still slow regarding expanded applications and related research of solar chimneys in large volume and multi-layer buildings, and contradictory conclusions appear due to the inherent complexity of the system.

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“…It was observed that most of them have ignored the impacts from the connected chamber ( i.e. , the room), which results in overestimation [14] . The solar chimney is usually adopted with multiple openings ( i.e.…”

Section: Introductionmentioning

confidence: 99%

Ventilating aged-care center based on solar chimney: Design and theoretical analysis

Wang¹,

Zhang²,

Wu³

et al. 2022

Energy and Buildings

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An empirical model to predict the performance of typical solar chimneys considering both room and cavity configurations

Cited by 67 publications

References 36 publications

Critical ventilation velocity under the blockage of different metro train in a long metro tunnel

Critical ventilation velocity under the blockage of different metro train in a long metro tunnel

Solar Chimney Applications in Buildings

Ventilating aged-care center based on solar chimney: Design and theoretical analysis

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