Ventilation impacts on infection risk mitigation, improvement of environmental quality and energy efficiency for subway carriages

Ren Chen; Chen Haofu; Wang JunqiFeng ZhuangboCao Shi-Jie

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Ventilation impacts on infection risk mitigation, improvement of environmental quality and energy efficiency for subway carriages

机译：Ventilation impacts on infection risk mitigation, improvement of environmental quality and energy efficiency for subway carriages

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摘要

Subway carriages are enclosed for extended periods of time, with a high density of passengers. Providing a safe, healthy, and comfortable cabin environment is a great challenge, particularly during the COVID-19 pandemic. An increase in ventilation rate can potentially reduce infection probability, which may result in worsening environmental quality (e.g., thermal comfort) and larger energy consumption. Thus, exploring the trade-off among infection risk, environmental quality (with regard to ventilation, thermal comfort, and air quality), and energy consumption is important to optimize ventilation systems for carriages. The effect of different supply air parameters (e.g., velocity and temperature) and ventilation modes of mixing ventilation (MV) Supply air from the Floor and Return air from the Ceiling (SFRC) was studied. The questionnaires were analyzed to explore passenger dissatisfaction with the carriage environment using a MV system. Simulations were performed to predict the velocity, temperature, and CO2 concentration fields. In addition, the comprehensive benefit was evaluated by analytic hierarchy process (AHP), based on infection probability from the revisited Wells-Riley equation, Air Diffusion Performance Index (ADPI), Predicted Mean Vote (PMV), Pollutant Removal Effectiveness (PRE) and energy consumption estimated by cooling load (Lcool). Compared with MV, the optimized SFRC provided softer draft sensation and decreased CO2 concentration by 42. The SFRC achieved better comprehensive benefits, with an infection risk reduced to 0.4, ADPI of 80, PMV approaching zero, PRE up to 16, and energy efficiency increased by 30. This work contributes to the optimal design of subway carriage ventilation systems in the post-epidemic era.

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《Building and environment》 |2022年第8期|1-23|共23页
作者
Ren Chen; Chen Haofu; Wang JunqiFeng ZhuangboCao Shi-Jie;
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作者单位

Southeast Univ;

Tianjin Univ;

Southeast Univ||Univ Surrey;

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原文格式 PDF
正文语种英语
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关键词
Subway carriage; Infection risk; Ventilation; Thermal comfort; Air quality; Energy efficiency;

Ventilation impacts on infection risk mitigation, improvement of environmental quality and energy efficiency for subway carriages

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