Hybrid emergency ventilation system for controlling inhaled contaminant dose in the case of chemical leakage

Shun Ichimiya, Alicia Murga, Sung Jun Yoo, Eisaku Sumiyoshi, Hiroshi Harashima, Zhengwei Long, Kazuhide Ito

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


In factories where high-risk chemical pollutants are treated, it is essential to anticipate response measures in the event of chemical pollutant leakage to minimize adverse health effects on workers. When high-risk liquid chemical pollutants are assumed to be leaked inside enclosed spaces, it becomes crucial to predict the non-uniform concentration distributions in enclosed spaces and evaluate the health impacts and risks of short-time exposure to prevent large-scale accidents. Therefore, we have developed an emergency ventilation system for controlling the inhaled contaminant dose of factory workers. In this study, assuming a worst-case scenario liquid chemical pollutant leak in an enclosed factory space, the advantages and performance of a hybrid ventilation system that combines displacement and push–pull type ventilation systems were numerically investigated. Installation of wall materials that facilitate photocatalytic oxidation (PCO) reactions for background passive concentration control was also discussed. Based on the demonstrative numerical analyses for a realistic factory space, push–pull type ventilation system was confirmed to effectively suppress chemical pollutant diffusion in enclosed spaces with a low ventilation rate. Wall materials with the PCO mechanism had a certain contribution to the control of peak concentration.

Original languageEnglish
Pages (from-to)696-709
Number of pages14
JournalIndoor and Built Environment
Issue number3
Publication statusPublished - Mar 2022

All Science Journal Classification (ASJC) codes

  • Public Health, Environmental and Occupational Health


Dive into the research topics of 'Hybrid emergency ventilation system for controlling inhaled contaminant dose in the case of chemical leakage'. Together they form a unique fingerprint.

Cite this