Experimental study on airflow characteristics of a square column attached ventilation mode

Yin, Haiguo; Li, Angui; Liu, Zhiyong; Sun, Yixiang; Chen, Ting

doi:10.1016/j.buildenv.2016.09.006

Cited by 62 publications

(16 citation statements)

References 32 publications

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“…To be more specific, displacement ventilation seems to be the most promising for creating a better IAQ and an acceptable thermal comfort level indoors [25,269]. Displacement ventilation based on square column attachment has superior performance of ventilation efficiencies and thermal comforts compared to traditional mixing ventilations [270,271]. Meanwhile, considering air velocity, air temperature, age of air, and relative warmth index (RWI), Liu et al assessed air distributions by adopting three different air supply schemes (mixing ventilation, stratified air ventilation, and air curtain ventilation) for a subway platform and demonstrated that air curtain ventilation presented an appropriate velocity and temperature distribution [22].…”

Section: Mitigation Measuresmentioning

confidence: 99%

Environmental and Health Effects of Ventilation in Subway Stations: A Literature Review

Wen

Leng

Shen

et al. 2020

IJERPH

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Environmental health in subway stations, a typical type of urban underground space, is becoming increasingly important. Ventilation is the principal measure for optimizing the complex physical environment in a subway station. This paper narratively reviews the environmental and health effects of subway ventilation and discusses the relevant engineering, environmental, and medical aspects in combination. Ventilation exerts a notable dual effect on environmental health in a subway station. On the one hand, ventilation controls temperature, humidity, and indoor air quality to ensure human comfort and health. On the other hand, ventilation also carries the potential risks of spreading air pollutants or fire smoke through the complex wind environment as well as produces continuous noise. Assessment and management of health risks associated with subway ventilation is essential to attain a healthy subway environment. This, however, requires exposure, threshold data, and thereby necessitates more research into long-term effects, and toxicity as well as epidemiological studies. Additionally, more research is needed to further examine the design and maintenance of ventilation systems. An understanding of the pathogenic mechanisms and aerodynamic characteristics of various pollutants can help formulate ventilation strategies to reduce pollutant concentrations. Moreover, current comprehensive underground space development affords a possibility for creating flexible spaces that optimize ventilation efficiency, acoustic comfort, and space perception.

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Section: Mitigation Measuresmentioning

confidence: 99%

Environmental and Health Effects of Ventilation in Subway Stations: A Literature Review

Wen

Leng

Shen

et al. 2020

IJERPH

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“…Taking the square column attached ventilation as an example, three regions can be divided including the column attached region, the primary floor attached region and the merged floor attached region (Figure 3(b)). 13 With an increase in the supply air velocity, the main body thickness of the attached supply air becomes thinner, which corresponds to a lower degree of entrainment between the supply air and the ambient air. There can be a great benefit to promote ventilation efficiency (Figure 3(c)).…”

Section: Performance Of Attachment Ventilationmentioning

confidence: 99%

Extended Coanda Effect and attachment ventilation

2019

Indoor and Built Environment

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“…Because of this, the experimental test was carried out under isothermal conditions. However, the main purpose of this experiment was to introduce the CAV mode and obtain some airflow characteristics for engineering design, where the isothermal condition was also useful [18].…”

Section: Experimentationmentioning

confidence: 99%

“…Furthermore, the CAV also has the potential to overcome the drawbacks of take-up effective occupied space when configured DV air diffusers. Consequently, this ventilation strategy is believed to combine the advantages of both the MV and DV systems [18].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of An Innovative Column Attachment Ventilation

Yin

et al. 2019

E3S Web Conf.

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An innovative column attachment ventilation (CAV) was proposed for heating, ventilating and air-conditioning (HVAC) systems and its performance was evaluated through experimental investigation and numerical modeling. Airflow pattern, air temperature distribution, air diffusion performance index (ADPI), predicted mean vote (PMV), and draught rate (DR), were used as the performance indicators to investigate the air distribution performance. The ventilation effectiveness for heat removal in the CAV mode was compared with a conventional mixing ventilation (MV). The results showed that the discharged air from the linear slot diffuser can attach to the column and enter into the occupied zone creating air lake phenomenon. The airflow spread over the floor in a radial pattern behaved as a stratified air distribution like displacement ventilation (DV), providing good air quality and comfort level for occupants. Moreover, the heat removal effectiveness in the CAV was found to be higher than in the MV, i.e. 1.32 in the C-CAV and 1.29 in the S-CAV modes. The column attachment ventilation can achieve thermal comfort in the occupied zone without local discomfort caused by high vertical temperature difference and draught, and this ventilation strategy could be expected as a new and efficient air distribution pattern for different HVAC applications.

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Experimental study on airflow characteristics of a square column attached ventilation mode

Cited by 62 publications

References 32 publications

Environmental and Health Effects of Ventilation in Subway Stations: A Literature Review

Environmental and Health Effects of Ventilation in Subway Stations: A Literature Review

Extended Coanda Effect and attachment ventilation

Performance Evaluation of An Innovative Column Attachment Ventilation

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