Research on the effect of different position on classroom ventilation in a “L” type teaching building

Liu, Xiaodong; Li, Yang; Niu, Shengnan

doi:10.1016/j.jobe.2020.101852

Cited by 10 publications

(3 citation statements)

References 38 publications

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“…Although the "air age" can accurately reflect the freshness of air at a specific location in a room, it is challenging to comprehensively evaluate the overall air quality of the entire space. Liu [39] and Yang [40] have proposed a novel concept, namely area ratio of age of air (AOA), for assessing overall air quality in a classroom. The calculation formula is as follows:…”

Section: Evaluation Methodsmentioning

confidence: 99%

“…Due to the noticeable slow-growth region (decline area) in the curve, prolonged ventilation may not necessarily lead to higher ventilation efficiency and may even fail to meet residents' comfort [43,44]. Therefore, according to "GB/T 50378-2019" [45] and the study by Liu [39], it is known that when the continuous ventilation time of the room ensures that the value of VOA exceeds 70% (i.e., VOA > 70%), the indoor air quality reaches an acceptable level. The time corresponding to the VOA value of 70%, i.e., T VOA=70% , is the minimum ventilation time that the room should maintain under such conditions.…”

Section: Evaluation Methodsmentioning

confidence: 99%

“…This study presents a systematic analysis of indoor natural ventilation of the room in "line" type dormitory buildings under varying environmental conditions, utilizing the CFD method. This work improves the way Liu [39] and Yang [40] use air age as an indicator to analyze indoor environmental quality and utilizes the widely adopted Rosin-Rammler distribution method in data statistics to fit the proportion curve of indoor air age more conveniently. Moreover, this study facilitates a comparative analysis of indoor air quality under diverse environmental conditions by utilizing the VOA curve proposed in this article.…”

Section: 𝐶 = 𝐶 − 𝐶mentioning

confidence: 99%

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Research on the Impact of Air Temperature and Wind Speed on Ventilation in University Dormitories under Different Wind Directions (Northeast China)

Cheng,

Yang,

Xie

et al. 2024

Buildings

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This study employs computational fluid dynamics to analyze the natural ventilation conditions of university student dormitories in the northeastern region of China under various outdoor wind directions, wind speeds, and temperature conditions. By separately simulating room natural ventilation efficiency under four different outdoor wind speeds (1.5 m/s, 3.3 m/s, 5.4 m/s and 7.9 m/s) at different outdoor temperatures (−10 °C, 0 °C, 10 °C and 20 ℃), curves of indoor pollutant removal rates (VOA-Time) are established for different wind directions. The study also determines the minimum ventilation time required for rooms under different environmental conditions (TVOA=70%). The data indicate that, despite the promotion of ventilation efficiency with increasing wind speed or indoor-outdoor temperature difference, the wind direction determines the extent to which these factors enhance room ventilation efficiency. Furthermore, there are corresponding mathematical relationships between TVOA=70%, outdoor temperature, wind speed, and different wind directions, allowing for predictions related to the rate of indoor carbon dioxide change. The research findings will assist students in formulating more effective ventilation strategies under complex outdoor environmental conditions.

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Section: Evaluation Methodsmentioning

confidence: 99%