Human exposure to air contaminants under the far-UVC system operation in an office: effects of lamp position and ventilation condition DOI Creative Commons
Seongjun Park, Donghyun Rim

Scientific Reports, Год журнала: 2024, Номер 14(1)

Опубликована: Окт. 18, 2024

The far-UVC (222 nm) system has emerged as a solution for controlling airborne transmission, yet its effect on indoor air quality, particularly concerning positioning, remains understudied. In this study, we examined the impact of lamp position disinfection and secondary contaminant formation in small office. We employed three-dimensional computational fluid dynamics (CFD) model to integrate UV intensity fields formed by different positions (ceiling-mounted, wall-mounted, stand-alone types) along with quality model. Our findings reveal that ceiling-mounted type reduces human exposure pathogens up 80% compared scenarios without far-UVC. For all positions, O3 concentration breathing zone increases 4–6 ppb after one hour operation. However, it should be noted high (> 25 ppb) forms near when is turned on. Moreover, ventilation plays crucial role determining contaminants. Increasing rate from 0.7 h−1 4 pathogen concentrations 90%. caution warranted higher rates can lead elevated indoors, especially under conditions outdoor concentrations.

Язык: Английский

Effectiveness, Safety, and Challenges of UVC Irradiation in Indoor Environments: A Decade of Review and Prospects DOI

Chaofan Lin,

Junzhou He,

Zhijian Liu

и другие.

Building and Environment, Год журнала: 2025, Номер unknown, С. 112868 - 112868

Опубликована: Март 1, 2025

Язык: Английский

Процитировано

1
GUV Installations Demonstrate Effectiveness and Exposure Safety in Field Settings DOI
Belal Abboushi,

Eduardo Rodriguez-Feo Bermudez,

Jason Tuenge

и другие.

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Апрель 22, 2025

Germicidal ultraviolet (GUV) radiation is used in various building types and indoor applications across the U.S. to mitigate risk of infection from airborne pathogens. However, date, few studies have evaluated situ effectiveness, safety, occupant's experience with these installations. To address this gap, we developed applied a protocol for evaluating performance whole-room (far UV-C) upper-room GUV Radiometric electrical measurements were collected characterizing spectrum, fluence rate, eye skin exposure, energy use 15 Additionally, questionnaire asked facility managers occupants about their satisfaction Most installations did not exceed time weighted average limits safety. Findings showed that contributed between 3% 150% toward meeting ASHRAE 241 equivalent clean airflow targets. These findings support further deployment technologies help inactivate The system characterization reported article can be inform simulation assumptions.

Язык: Английский

Процитировано

0
Effects of Germicidal UV Air Disinfection Devices on Indoor Air Quality in an Unoccupied Aged Care Facility DOI Creative Commons
Emily B. Franklin, Amanda J. Wheeler,

Jason Ward

и другие.

ACS ES&T Air, Год журнала: 2025, Номер unknown

Опубликована: Апрель 28, 2025

Язык: Английский

Процитировано

0
Human exposure to air contaminants under the far-UVC system operation in an office: effects of lamp position and ventilation condition DOI Creative Commons
Seongjun Park, Donghyun Rim

Scientific Reports, Год журнала: 2024, Номер 14(1)

Опубликована: Окт. 18, 2024

The far-UVC (222 nm) system has emerged as a solution for controlling airborne transmission, yet its effect on indoor air quality, particularly concerning positioning, remains understudied. In this study, we examined the impact of lamp position disinfection and secondary contaminant formation in small office. We employed three-dimensional computational fluid dynamics (CFD) model to integrate UV intensity fields formed by different positions (ceiling-mounted, wall-mounted, stand-alone types) along with quality model. Our findings reveal that ceiling-mounted type reduces human exposure pathogens up 80% compared scenarios without far-UVC. For all positions, O3 concentration breathing zone increases 4–6 ppb after one hour operation. However, it should be noted high (> 25 ppb) forms near when is turned on. Moreover, ventilation plays crucial role determining contaminants. Increasing rate from 0.7 h−1 4 pathogen concentrations 90%. caution warranted higher rates can lead elevated indoors, especially under conditions outdoor concentrations.

Язык: Английский

Процитировано

2