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Stratum Ventilation: Enabling Simultaneous Energy Conservation and Air Purification in Subway Cars

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  • Yanhui Mao

    (School of Architecture and Transportation Engineering, Ningbo University of Technology, Ningbo 315211, China)

  • Shengxu Wang

    (School of Architecture and Transportation Engineering, Ningbo University of Technology, Ningbo 315211, China)

  • Jianzhou Liang

    (School of Architecture and Transportation Engineering, Ningbo University of Technology, Ningbo 315211, China)

  • Saiqin Mao

    (School of Architecture and Transportation Engineering, Ningbo University of Technology, Ningbo 315211, China)

  • Yukun Han

    (School of Architecture and Transportation Engineering, Ningbo University of Technology, Ningbo 315211, China)

  • Shengquan Zhang

    (School of Architecture and Transportation Engineering, Ningbo University of Technology, Ningbo 315211, China)

Abstract

The supply of fresh air for underground rail transit systems is not as simple as opening windows, which is a conventional ventilation (CV) measure adopted in aboveground vehicles. This study aims to improve contaminant dilution and air purification in subway car ventilation systems and the safety of rail transit post-coronavirus disease pandemic era. We designed an air conditioning (AC) terminal system combined with stratum ventilation (SV) to enable energy consumption reduction for subway cars. We experimentally tested the effectiveness of a turbulence model to investigate ventilation in subway cars. Further, we compared the velocity fields of CV and SV in subway cars to understand the differences in their airflow organizations and contaminant removal efficiencies, along with the energy savings of four ventilation scenarios, based on the calculations carried out using computational fluid dynamics. At a ventilation flow rate of 7200 m 3 /h, the CO 2 concentration and temperature in the breathing areas of seated passengers were better in the SV than in the CV at a rate of 8500 m 3 /h. Additionally, the energy-saving rate of SV with AC cooling was 14.05%. The study provides new ideas for reducing the energy consumption of rail transit and broadens indoor application scenarios of SV technology.

Suggested Citation

  • Yanhui Mao & Shengxu Wang & Jianzhou Liang & Saiqin Mao & Yukun Han & Shengquan Zhang, 2022. "Stratum Ventilation: Enabling Simultaneous Energy Conservation and Air Purification in Subway Cars," IJERPH, MDPI, vol. 19(21), pages 1-16, November.
  • Handle: RePEc:gam:jijerp:v:19:y:2022:i:21:p:14521-:d:964078
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    References listed on IDEAS

    as
    1. Li, Han & Fu, Zheng & Xi, Chang & Li, Nana & Li, Wei & Kong, Xiangfei, 2022. "Study on the impact of parallel jet spacing on the performance of multi-jet stratum ventilation," Applied Energy, Elsevier, vol. 306(PB).
    2. Kong, Xiangfei & Xi, Chang & Li, Han & Lin, Zhang, 2020. "Multi-parameter performance optimization for whole year operation of stratum ventilation in offices," Applied Energy, Elsevier, vol. 268(C).
    3. Jeffrey E. Harris, 2020. "The Subways Seeded the Massive Coronavirus Epidemic in New York City," NBER Working Papers 27021, National Bureau of Economic Research, Inc.
    4. Lina Zhang & Yanhui Mao & Qiu Tu & Xiaogang Wu & Lingyu Tan, 2021. "Effects of Supply Parameters of Stratum Ventilation on Energy Utilization Efficiency and Indoor Thermal Comfort: A Computational Approach," Mathematical Problems in Engineering, Hindawi, vol. 2021, pages 1-16, April.
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