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

Yanhui Mao (), Shengxu Wang, Jianzhou Liang, Saiqin Mao, Yukun Han and Shengquan Zhang
Additional contact information
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

IJERPH, 2022, vol. 19, issue 21, 1-16

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.

Keywords: subway car ventilation system; stratum ventilation; contaminant removal; dilution purification; energy conservation; coronavirus disease pandemic; conventional ventilation; computational fluid dynamics; air conditioning (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/1660-4601/19/21/14521/pdf (application/pdf)
https://www.mdpi.com/1660-4601/19/21/14521/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jijerp:v:19:y:2022:i:21:p:14521-:d:964078

Access Statistics for this article

IJERPH is currently edited by Ms. Jenna Liu

More articles in IJERPH from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().