Decreasing inhaled contaminant dose of a factory worker through a hybrid Emergency Ventilation System: Performance evaluation in worst-case scenario

Murga, Alicia; Long, Zhengwei; Yoo, Sungjun; Sumiyoshi, Eisaku; Ito, Kazuhide

doi:10.1016/j.enbenv.2020.04.007

Cited by 23 publications

(11 citation statements)

References 37 publications

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“…Haghighat et al 36 and Zang et al 37 have reported the effective diffusion coefficient (D eg ) in Equations ( 1), (3), and ( 8) and the partition coefficient (K) in Equations ( 3), (7), and (8) of gas-phase ethyl acetate for concrete. Based on their reports, D eg and K were set to 4.33 × 10 −11 m 2 /s and 1168 [−], respectively.…”

Section: Selection Process For Key Model Parametersmentioning

confidence: 99%

“…Highly heterogeneous airflow and scalar distributions, such as those of chemical compounds, in an enclosed space are generally formed by a complex and nonlinear fluid motion 1‐6 . In particular, in a factory or chemical plant with a large indoor volume, the tendency toward heterogeneity associated with incomplete mixing is accentuated 7‐10 . In addition to the transient and heterogeneous airflow pattern, another important factor in the formation of this non‐uniform scalar concentration distribution is the heterogeneity of the emission source of the scalar.…”

Section: Introductionmentioning

confidence: 99%

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Internal diffusion and re‐emission of leaked liquid ethyl acetate from mortar materials

Harashima

Sumiyoshi

Ito

2022

Japan Architectural Review

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Assuming the leakage of hazardous liquid chemicals in factories and chemical plants caused by natural disasters or human error, it is important to precisely estimate exposure risk and design appropriate evacuation plans and risk‐reduction measures. The exposure risk of indoor residents to leaked chemicals may be estimated using direct measurements or theoretical/numerical estimations of gas‐phase concentrations. Although mathematical models of gas‐phase concentration in the workplace are essential for predicting exposure concentrations at the design stage, practical models have not yet been fully established. We previously proposed practical numerical models to assess indoor gas‐phase concentration distributions after the accidental leakage of liquid chemicals using liquid toluene as a representative hazardous chemical. In this study, the leakage of liquid ethyl acetate, a commonly used organic solvent, into mortar flooring was reproduced in a small test chamber, and numerical analysis was performed. The results showed that the time history of the chamber exhaust concentration had a sharp peak and differed significantly from that of toluene. Three‐dimensional computational fluid dynamics (CFD) analysis incorporating practical ethyl acetate emission models reproduced the external and internal emission characteristics of leaked ethyl acetate on the mortar material. The models showed reasonable agreement with the experimental data.

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Section: Selection Process For Key Model Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Internal diffusion and re‐emission of leaked liquid ethyl acetate from mortar materials

Harashima

Sumiyoshi

Ito

2022

Japan Architectural Review

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“…[19][20][21][22][23][24] Furthermore, advanced computer-simulated persons (CSPs), which can treat specific characteristics of the human body, have been suggested as a 'digital twin' for CFD simulation. 25,26 In addition, the thermoregulatory function, breathing, dermal adsorption and respiratory exposure mechanisms of contaminants have been reproduced in detail. [27][28][29][30][31] These comprehensive human models can be used to predict detailed health risks caused by poor IAQ and the thermal environment as a result of interaction with the surrounding environment.…”

Section: Introductionmentioning

confidence: 99%

Hygro-thermo-chemical transfer analysis of clothing microclimate using three-dimensional digital clothing model and computer-simulated person

Murota

Kang

Hyodo

et al. 2022

Indoor and Built Environment

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Several studies regarding indoor environmental quality assessments based on computational human models have been reported. Recently, various computer-simulated persons for computational fluid dynamics (CFD) simulations that reproduce a detailed human body geometry has been developed. However, clothing is usually treated with simplification as a resistance to heat/contaminant transfer, and detailed hygro-thermo-chemical transfer phenomena in clothing-centred area with complex geometry have not been fully discussed. It is also important to investigate the ventilation characteristics inside the air gap between the clothing and the human body. Thus, this study aimed to develop an analytical method of three-dimensional clothing model that can be applied to a computer-simulated person (CSP) for indoor computational fluid dynamics analysis. To identify the impact of the clothing model on the human and the microclimate around the body, hygro-thermo-chemical transfer analyses were conducted in a virtual simplified model room. By reproducing the detailed clothing geometry, ventilation inside the air gap and clothing-centred hygro-thermo-chemical transfer characteristics were quantitatively investigated. The data analysis technique established in this study could contribute to preparing foundational data for simplification of numerical modelling of clothing.

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“…Hence, ventilation is one of the most important elements concerning the improvement of thermal conditions inside factories and it could reduce pollution [7]. Thus, it plays a significant role in improving the quality of the industrial environment as a whole and contributes to avoiding many damages to workers and machines [8].…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study for Forced Ventilation Systems in Industrial Buildings to Improve the Workers’ Thermal Comfort

et al. 2021

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The appropriate ventilation for factory spaces with regard to volume flow rate and air velocity inside the factory is one of the most important factors in the improvement of the thermal comfort of workers and in the reduction of the percentage of pollution they are exposed to, which in turn helps to improve the work environment and increase productivity. It also could improve the performance of machines. Hence, overheating can cause various problems and malfunctions. In this study, three types of mechanical ventilation systems are compared: the wall fan extract ventilation system, the roof fan extract ventilation system, and the spot cooling system. The Ansys software has been used to conduct the computational fluid dynamics (CFD) simulations for the different cases and the ventilation effectiveness factor (VEF) has been used to compare the performances of the three systems. The ventilation factor notably relies on the temperature distribution produced through the modeling and the results show that the most optimal system that can be used for similar factory spaces is the forced ventilation system. Finally, it is also the best in terms of energy consumption, despite the increase in the initial cost of its installation.

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Decreasing inhaled contaminant dose of a factory worker through a hybrid Emergency Ventilation System: Performance evaluation in worst-case scenario

Cited by 23 publications

References 37 publications

Internal diffusion and re‐emission of leaked liquid ethyl acetate from mortar materials

Internal diffusion and re‐emission of leaked liquid ethyl acetate from mortar materials

Hygro-thermo-chemical transfer analysis of clothing microclimate using three-dimensional digital clothing model and computer-simulated person

A Comparative Study for Forced Ventilation Systems in Industrial Buildings to Improve the Workers’ Thermal Comfort

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