The effects of diffuser type on thermal flow and contaminant transport in high-speed train (HST) cabins – a numerical study

Yang, Lin; Li, Mengxi; Li, Xiangdong; Tu, Jiyuan

doi:10.1080/14733315.2017.1351736

Cited by 25 publications

(29 citation statements)

References 20 publications

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“…The HSR cabin ventilation model has been validated in the author’s previous publication. 17 Here, the radiation model was validated using Rodler’s experimental data 21 and Gendelis’s simulation results. 22…”

Section: Resultsmentioning

confidence: 99%

“…The HSR cabin ventilation model has been validated in the author's previous publication. 17 Here, the radiation model was validated using Rodler's experimental data 21 and Gendelis's simulation results. 22 Rodler's experiment was carried out in a thermal test building at the BESTLab (Building Envelop and Solar Technology Laboratory), which is located in 48 22 0 N 249 0 E. The model represents a single room with 2.97 m in depth, 2.89 m in width and 2.82 m in height.…”

Section: Validation Of Numerical Modelmentioning

confidence: 99%

“…These models have been well validated by many studies 29 and proven to be robust for modelling indoor thermal flows. The model equations have been detailed in author’s previous publication 17 and are not be expatiated here.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…6 On the other hand, the HSR cabin itself could have an impact on the effect of the solar radiation, such as the train travelling direction, the materials in the cabin and window, the arrangement of passengers and cabin geometry. [17][18][19] Therefore, considering the specific characters of HSR cabin and the complexity of solar radiation process, the study of thermal comfort in HSR cabins under solar radiation environment is therefore necessary. 20 The main objective of this study was to investigate the solar radiation effect on thermal comfort in a typical HSR cabin.…”

Section: Introductionmentioning

confidence: 99%

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Thermal comfort analysis of a high-speed train cabin considering the solar radiation effects

Yang

2019

Indoor and Built Environment

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Due to the fast development of high-speed rail (HSR) around the world, high-speed trains (HSTs) are becoming a strong competitor against airliners in terms of long-distance travel. Compared with airliner cabins, HST cabins have much larger window sizes. When the big windows provide better lighting and view of the scenery, they also have significant effects on the thermal conditions in the cabins due to the solar radiation through them. This study presents a numerical study on the solar radiation on the thermal comfort in a typical HST cabin. The effect of solar radiation was discussed in terms of airflow pattern, temperature distribution and thermal comfort indices. Parametric studies with seven different daytime hours were carried out. The effect of using the roller curtain was also studied. The overall cabin air temperature, especially near passengers, was found to have significantly increased by solar radiation. Passengers sitting next to windows were recorded to have an obvious thermal comfort variation at different hours of the day. To improve the passengers’ comfort and reduce energy consumption during hot weather, the use of a curtain could effectively reduce the solar radiation effect in the cabin environment.

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Section: Resultsmentioning

confidence: 99%

Section: Validation Of Numerical Modelmentioning

confidence: 99%

Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal comfort analysis of a high-speed train cabin considering the solar radiation effects

Yang

2019

Indoor and Built Environment

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“…On the other hand, the cough-jet even in the first few seconds was considered as an important factor on the local airflow distribution from other indoor spaces. 9 Kwon et al 10 pointed out that accurate description of the initial velocity distribution from coughing process is particularly important in the study of the fluid dynamics property of the respiratory particles. Their study concluded that only considering the airflow field without the cough-jet may not be an appropriate representation of the transport and distribution of airborne contaminants.…”

Section: Introductionmentioning

confidence: 99%

Effects of cough-jet on airflow and contaminant transport in an airliner cabin section

Yang

Yan

et al. 2017

The Journal of Computational Multiphase Flows

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The goals of this study were to investigate the effect of cough-jet on local airflow and contaminant transport in a typical cabin environment by using computational fluid dynamics. A fully occupied airliner cabin section was employed as the computational domain. Contaminants were released through coughing passengers from different locations inside the cabin. Numerical results in terms of contaminant transport characteristics were examined and compared. It can be concluded that cough-jet has significant effects on air flow in front of cough passenger in a short period of time. Also, it was found that, without considering the cough-jet model, the simulation results could not be a precise representation of the transport and distribution of cough-generated airborne contaminants.

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Experimental and numerical investigation of TVOC concentrations and ventilation dilution in enclosed train cabin

et al. 2021

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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/m 3 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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The effects of diffuser type on thermal flow and contaminant transport in high-speed train (HST) cabins – a numerical study

Cited by 25 publications

References 20 publications

Thermal comfort analysis of a high-speed train cabin considering the solar radiation effects

Thermal comfort analysis of a high-speed train cabin considering the solar radiation effects

Effects of cough-jet on airflow and contaminant transport in an airliner cabin section

Experimental and numerical investigation of TVOC concentrations and ventilation dilution in enclosed train cabin

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