Abstract
Air pollution in trains is an important factor threatening human health, which has attracted more and more attention in the worldwide public health researches. In this study, one cabin of a fully enclosed train was taken as an example to conduct experimental and numerical research on pollution level and distribution characteristic of total volatile organic compound (TVOC). The results show that when the average emission rate under daily environmental conditions was taken as the reference, TVOC concentration in the cabin exceeded the limit level of Chinese Indoor Air Quality Standard by more than 4 times. The obvious pollutants accumulative phenomenon could be found at bottoms and corners under the action of airflow. Setting air inlets at the roof of the train, mean age of air ranged from 30 s to 50 s in the breathing area. The concentration of pollutants was the lowest at 2.5–5 m from the center point of the cabin structure, and the ventilation efficiency was the highest. The introduction of clean fresh air could effectively eliminate pollutants. When the complete displacement ventilation rates were 51.4 h−1 and 28.6 h−1, the removal efficiency of pollutants was about 0.85 and 0.48 mg/m3 per minute, respectively. This study was helpful to the improvement and optimization design of air quality and ventilation mode in trains.
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Abbreviations
- A inlet :
-
air inlets areas (m2)
- A outlet :
-
air outlets areas (m2)
- ACH:
-
air changes per hour (h−1)
- C 0 :
-
initial concentration of TVOC in material (µg/m3)
- C a :
-
contaminant concentration in air (mg/m3)
- C inlet :
-
inflow TVOC concentrations (mg/m3)
- C outlet :
-
outflow TVOC concentrations (mg/m3)
- CFD:
-
computational fluid dynamics
- CRH:
-
China railway high-speed
- D a :
-
TVOC diffusion coefficient in air (m2/s)
- D m :
-
diffusion coefficient (m2/s)
- E(t):
-
emission rate factor (µg/(m2·h))
- f :
-
fresh air ratio (%)
- IAQ:
-
indoor air quality
- K :
-
partition coefficient between materials and air
- Q :
-
ventilation volume (m3/h)
- Sc :
-
turbulent Schmidt number
- S φ :
-
source term
- TVOC:
-
total volatile organic compound
- t :
-
time (s or h)
- U inlet :
-
inlet air velocities (m/s)
- U outlet :
-
outlet air velocities (m/s)
- u j :
-
air convective velocity (m/s)
- V :
-
volume of the environment cabin (1 m3)
- VOCs:
-
volatile organic compounds
- W :
-
time for a complete dilution pollutant (s)
- x :
-
one dimensional coordinate (m)
- Γ φ :
-
diffusion coefficient
- δ :
-
material thickness (m)
- ε A :
-
pollution removal ability of air distribution system
- ν t :
-
turbulent kinematic viscosity (m2/s)
- ρ :
-
density (kg/m3)
- τ n :
-
nominal time constant (s)
References
Buczynska AJ, Krata A, Stranger M, et al. (2009). Atmospheric BTEX-concentrations in an area with intensive street traffic. Atmospheric Environment, 43: 311–318.
Chen X, Zhang G, Zhang Q, et al. (2011). Mass concentrations of BTEX inside air environment of buses in Changsha, China. Building and Environment, 46: 421–427.
Deng B, Kim CN (2007). CFD simulation of VOCs concentrations in a resident building with new carpet under different ventilation strategies. Building and Environment, 42: 297–303.
Desai PS, Sawant N, Keene A (2021). On COVID-19-safety ranking of seats in intercontinental commercial aircrafts: A preliminary multiphysics computational perspective. Building Simulation, 14: 1585–1596.
Gao R, Zhang H, Li A, et al. (2021). Research on optimization and design methods for air distribution system based on target values. Building Simulation, 14: 721–735.
Gong Y, Wei Y, Cheng J, et al. (2017). Health risk assessment and personal exposure to Volatile Organic Compounds (VOCs) in metro carriages — A case study in Shanghai, China. Science of the Total Environment, 574: 1432–1438.
Guan J, Gao K, Wang C, et al. (2014). Measurements of volatile organic compounds in aircraft cabins. Part I: Methodology and detected VOC species in 107 commercial flights. Building and Environment, 72: 154–161.
Guan J, Li Z, Yang X (2015). Net in-cabin emission rates of VOCs and contributions from outside and inside the aircraft cabin. Atmospheric Environment, 111: 1–9.
Huang H, Haghighat F (2002). Modelling of volatile organic compounds emission from dry building materials. Building and Environment, 37: 1127–1138.
Kato S, Murakami S (1988). New ventilation efficiency scales based on spatial distribution of contaminant concentration aided by numerical simulation. ASHRAE Transactions, 94(2): 309–330.
Khanchi A, Hebbern CA, Zhu J, et al. (2015). Exposure to volatile organic compounds and associated health risks in Windsor, Canada. Atmospheric Environment, 120: 152–159.
Kim KW, Lee BH, Kim S, et al. (2011). Reduction of VOC emission from natural flours filled biodegradable bio-composites for automobile interior. Journal of Hazardous Materials, 187: 37–43.
Li X, Li D, Yang X, et al. (2003). Total air age: An extension of the air age concept. Building and Environment, 38: 1263–1269.
Li T, Bai Y, Liu Z, et al. (2006). Air quality in passenger cars of the ground railway transit system in Beijing, China. Science of the Total Environment, 367: 89–95.
Li F, Liu J, Pei J, et al. (2014). Experimental study of gaseous and particulate contaminants distribution in an aircraft cabin. Atmospheric Environment, 85: 223–233.
Li J, Cao X, Liu J, et al. (2015). Global airflow field distribution in a cabin mock-up measured via large-scale 2D-PIV. Building and Environment, 93: 234–244.
Liu Z, Howard-Reed C, Cox SS, et al. (2014). Diffusion-controlled reference material for VOC emissions testing: effect of temperature and humidity. Indoor Air, 24: 283–291.
Liu A, Huang X, Yuan Z, et al. (2021). Implementing an emissions-rate model in computational fluid dynamics simulations of contaminant diffusion processes: A case study with xylene in painting workshops. Indoor and Built Environment, 30: 906–923.
Lv M, Huang W, Rong X, et al. (2020). Source apportionment of volatile organic compounds (VOCs) in vehicle cabins diffusing from interior materials. Part I: Measurements of VOCs in new cars in China. Building and Environment, 175: 106796.
Nielsen PV (2009). Control of airborne infectious diseases in ventilated spaces. Journal of the Royal Society Interface, 6: S747–S755.
Qin D, Guo B, Zhou J, et al. (2020). Indoor air formaldehyde (HCHO) pollution of urban coach cabins. Scientific Reports, 10: 332.
Shi Z, Bai J, Han Y (2020). Distribution of ozone and its volatiles in indoor environment: a numerical simulation with CFD for the aircraft cabin. Environmental Technology, 41: 3146–3156.
Song G, Qin T, Liu H, et al. (2010). Quantitative breath analysis of volatile organic compounds of lung cancer patients. Lung Cancer, 67: 227–231.
Tong Z, Liu H (2020). Modeling in-vehicle VOCs distribution from cabin interior surfaces under solar radiation. Sustainability, 12: 5526.
Wang C, Yang X, Guan J, et al. (2014a). Source apportionment of volatile organic compounds (VOCs) in aircraft cabins. Building and Environment, 81: 1–6.
Wang H, Lin M, Chen Y (2014b). Performance evaluation of air distribution systems in three different China railway high-speed train cabins using numerical simulation. Building Simulation, 7: 629–638.
Wang H, Zheng J, Yang T, et al. (2020). Predicting the emission characteristics of VOCs in a simulated vehicle cabin environment based on small-scale chamber tests: Parameter determination and validation. Environment International, 142: 105817.
Xiong J, Yao Y, Zhang Y (2011). C-history method: Rapid measurement of the initial emittable concentration, diffusion and partition coefficients for formaldehyde and VOCs in building materials. Environmental Science & Technology, 45: 3584–3590.
Xiong J, Wei W, Huang S, et al. (2013). Association between the emission rate and temperature for chemical pollutants in building materials: General correlation and understanding. Environmental Science & Technology, 47: 8540–8547.
Yang L, Li M, Li X, et al. (2018). The effects of diffuser type on thermal flow and contaminant transport in high-speed train (HST) cabins—A numerical study. International Journal of Ventilation, 17: 48–62.
You K, Ge Y, Hu B, et al. (2007). Measurement of in-vehicle volatile organic compounds under static conditions. Journal of Environmental Sciences, 19: 1208–1213.
Zhang Q, Zhang G (2007). Study on TVOCs concentration distribution and evaluation of inhaled air quality under a re-circulated ventilation system. Building and Environment, 42: 1110–1118.
Zhang G, Li T, Luo M, et al. (2008). Air pollution in the microenvironment of parked new cars. Building and Environment, 43: 315–319.
Zhang Y, Xiong J, Mo J, et al. (2016). Understanding and controlling airborne organic compounds in the indoor environment: Mass transfer analysis and applications. Indoor Air, 26: 39–60.
Zhu S, Demokritou P, Spengler J (2010). Experimental and numerical investigation of micro-environmental conditions in public transportation buses. Building and Environment, 45: 2077–2088.
Zou Z, He J, Yang X (2020). An experimental method for measuring VOC emissions from individual human whole-body skin under controlled conditions. Building and Environment, 181: 107137.
Acknowledgements
This work was supported by the Key Research and Development Program of Zhejiang Province (No. 2019C 03117).
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Zhao, L., Zhou, H., Jin, Y. et al. Experimental and numerical investigation of TVOC concentrations and ventilation dilution in enclosed train cabin. Build. Simul. 15, 831–844 (2022). https://doi.org/10.1007/s12273-021-0827-2
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DOI: https://doi.org/10.1007/s12273-021-0827-2