CFD study of the air distribution and occupant draught sensation in a patient ward equipped with protected zone ventilation

Aganović, Amar; Steffensen, Marie; Cao, Guangyu

doi:10.1016/j.buildenv.2019.106279

Cited by 40 publications

(21 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… Protected occupied zone ventilation (POV) Divided indoor environment into protected and polluted area by jet to isolate high-concentration pollutant airflow [ 45 ]. Used a low turbulence plane jet to separate an office environment into a few subzones [ 46 ]. Could be combined with other ventilation methods to improve the removal rate of pollutants [ 45 ].…”

Section: Categories Of Different Ventilation Modesmentioning

confidence: 99%

A review of different ventilation modes on thermal comfort, air quality and virus spread control

Fan

Wang

et al. 2022

Building and Environment

View full text Add to dashboard Cite

In the era of Corona Virus Disease 2019 (COVID-19), inappropriate indoor ventilation may turn out to be the culprit of microbial contamination in enclosed spaces and deteriorate the environment. To collaboratively improve the thermal comfort, air quality and virus spread control effect, it was essential to have an overall understanding of different ventilation modes. Hence, this study reviewed the latest scientific literature on indoor ventilation modes and manuals of various countries, identified characteristics of different ventilation modes and evaluated effects in different application occasions, wherefore to further propose their main limitations and solutions in the epidemic era. For thermal comfort, various non-uniform ventilation modes could decrease the floor-to-ceiling temperature difference, draft rate or PPD by 60%, 80% or 33% respectively, or increase the PMV by 45%. Unsteady ventilation modes (including intermittent ventilation and pulsating ventilation) could lower PPD values by 12%–37.8%. While for air quality and virus spread control, non-uniform ventilation modes could lower the mean age of air or contaminants concentration by 28.3%–47% or 15%–47% respectively, increase the air change efficiency, contaminant removal effectiveness or protection efficiency by 6.6%–10.4%, 22.6% or 14%–50% respectively. Unsteady ventilation mode (pulsating ventilation) could reduce the peak pollutant concentration and exposure time to undesirable concentrations by 31% and 48% respectively. Non-uniform modes and unsteady modes presented better performance in thermal comfort, air quality and virus spread control, whereas relevant performance evaluation indexes were still imperfect and the application scenarios were also limited.

show abstract

Section: Categories Of Different Ventilation Modesmentioning

confidence: 99%

A review of different ventilation modes on thermal comfort, air quality and virus spread control

Fan

Wang

et al. 2022

Building and Environment

View full text Add to dashboard Cite

show abstract

“…In their study, when the ACH increased, the PMV for the ceiling air supply mode did not change. Aganovic et al [72] proposed a protected occupied zone ventilation by using an air curtain between HCWs and patients. At a short distance from the air supply, the DRs of different body parts were evaluated, and were found to range from 0.9% to 31.0% [72] .…”

Section: Resultsmentioning

confidence: 99%

Adaptive Wall-Based Attachment Ventilation: A Comparative Study on Its Effectiveness in Airborne Infection Isolation Rooms with Negative Pressure

Zhang

Han

et al. 2022

Engineering

View full text Add to dashboard Cite

“…Different indoor air stability conditions in the model room are achieved by adjusting the temperatures on the top and the bottom at different values (Table 1 ). As the side walls in the corresponding experiment study (Gong and Deng 2017 ) were made of thermal insulation material with high thermal resistance that can effectively prevent heat from transferring from one side to the other, thus the boundary condition for sidewalls is assumed as adiabatic in the numerical simulation, which is a reasonable boundary condition for well-insulated rooms (Gao and Niu 2004 ; Gao and Niu 2006 ; Villafruela et al 2013 ; Aganovic et al 2019 ). Figure 2 illustrates the vertical distribution of temperature over Wall A and Wall B (Fig.…”

Section: Methodsmentioning

confidence: 99%

Assessment of personal exposure to infectious contaminant under the effect of indoor air stability

Deng

Gong

Chen

et al. 2021

Environ Sci Pollut Res

View full text Add to dashboard Cite

The objective of this study is to understand the effect of indoor air stability on personal exposure to infectious contaminant in the breathing zone. Numerical simulations are carried out in a test chamber with a source of infectious contaminant and a manikin (Manikin A). To give a good visual illustration of the breathing zone, the contaminant source is visualized by the mouth of another manikin. Manikin A is regarded as a vulnerable individual to infectious contaminant. Exposure index and exposure intensity are used as indicators of the exposure level in the breathing zone. The results show that in the stable condition, the infectious contaminant proceeds straightly towards the breathing zone of the vulnerable individual, leading to a relatively high exposure level. In the unstable condition, the indoor air experiences a strong mixing due to the heat exchange between the hot bottom air and the cool top air, so the infectious contaminant disperses effectively from the breathing zone. The unstable air can greatly reduce personal exposure to the infectious contaminant in the breathing zone. This study demonstrates the importance of indoor air stability on personal exposure in the indoor environment and provides a new direction for future study of personal exposure reduction in the indoor environment.

show abstract

CFD study of the air distribution and occupant draught sensation in a patient ward equipped with protected zone ventilation

Cited by 40 publications

References 24 publications

A review of different ventilation modes on thermal comfort, air quality and virus spread control

A review of different ventilation modes on thermal comfort, air quality and virus spread control

Adaptive Wall-Based Attachment Ventilation: A Comparative Study on Its Effectiveness in Airborne Infection Isolation Rooms with Negative Pressure

Assessment of personal exposure to infectious contaminant under the effect of indoor air stability

Contact Info

Product

Resources

About