Ventilation strategies to reduce airborne transmission of viruses in classrooms: A systematic review of scientific literature

Building and Environment, Год журнала: 2022, Номер 222, С. 109366 - 109366

Опубликована: Июль 7, 2022

Язык: Английский

---

Experimental research on energy utilization, aerosol transmission and thermal comfort under different ventilation strategies: Densely-occupied classrooms as a case study

Building and Environment, Год журнала: 2025, Номер unknown, С. 112523 - 112523

Опубликована: Янв. 1, 2025

Язык: Английский

---

Occupant-centric multicriteria optimization of hybrid personalized HVAC system: Impact of supply inlet layout and return air ratio

Energy and Buildings, Год журнала: 2025, Номер 333, С. 115494 - 115494

Опубликована: Фев. 19, 2025

Язык: Английский

---

The source control effect of personal protection equipment and physical barrier on short-range airborne transmission

Building and Environment, Год журнала: 2022, Номер 211, С. 108751 - 108751

Опубликована: Янв. 3, 2022

In order to control the spread of Covid-19, authorities provide various prevention guidelines and recommendations for health workers public. Personal protection equipment (PPE) physical barrier are most widely applied measures in practice due their affordability ease implementation. This study aims investigate effect PPE barriers on mitigating short-range airborne transmission between two people a ventilated environment. Four types (surgical mask, face shield, mouth visor), different sizes were tested controlled environment with life-size breathing thermal manikins. The was worn by source manikin test efficiency control. measurement results revealed that principles preventing droplet different. Instead filtering fine nuclei, they mainly redirect virus-laden exhalation jet avoid exhaled flow entering target's inhalation region. Physical can block spreading nuclei create good micro at short distances persons. However, special attention should be paid arranging operating ventilation system stagnant zone where contaminant accumulates.

Язык: Английский

---

Mitigation of breathing contaminants: Exhaust location optimization for indoor space with impinging jet ventilation supply

Journal of Building Engineering, Год журнала: 2023, Номер 69, С. 106250 - 106250

Опубликована: Март 9, 2023

Язык: Английский

---

Effectiveness of a portable personal air cleaner in reducing the airborne transmission of respiratory pathogens

Building and Environment, Год журнала: 2023, Номер 235, С. 110222 - 110222

Опубликована: Март 21, 2023

Язык: Английский

---

Dispersion of expectorated cough droplets with seasonal influenza in an office

Physics of Fluids, Год журнала: 2023, Номер 35(8)

Опубликована: Авг. 1, 2023

We do not fully grasp viral droplet transmission processes in ventilated interior environments. The core focus of our research is to investigate the effectiveness protected occupied zone ventilation (POV) through computational fluid dynamics models a simplified office setting. large-eddy simulation technique with Eulerian–Lagrangian model was implemented address complicated indoor such as turbulence, flow–aerosol interaction, and impact. computationally investigated effects desk partitions POV on cough droplets an office. approach tested using two distinct exhaust layouts four different rates (1.0, 1.2, 1.5, 1.8 m/s). A comparative analysis flow fields, topologies, particle directions has been studied. findings indicate that plane jet's influence performance. distributed virus around room, but compared up-exhaust cases, down-exhaust cases appeared have better shielded healthy person. This pattern could placement outlet systems significantly influences aerosol dispersion. results also show substantial streams may carry tiny particles (≤70 μm) throughout their path. Large (≥100 go far gas clouds. Most deposit solid surfaces various work sites per specific rates. Office workers need be very cautious these hazardous areas.

Язык: Английский

---

Compatibility of integrated physical barriers and personal exhaust ventilation with air distribution systems to mitigate airborne infection risk

Sustainable Cities and Society, Год журнала: 2024, Номер 103, С. 105282 - 105282

Опубликована: Фев. 17, 2024

Язык: Английский

---

New dose-response model and SARS-CoV-2 quanta emission rates for calculating the long-range airborne infection risk

Building and Environment, Год журнала: 2022, Номер 228, С. 109924 - 109924

Опубликована: Дек. 14, 2022

Predictive models for airborne infection risk have been extensively used during the pandemic, but there is yet still no consensus on a common approach, which may create misinterpretation of results among public health experts and engineers designing building ventilation. In this study we applied latest data viral load, aerosol droplet sizes removal mechanisms to improve Wells Riley model by introducing following novelties i) new calculate total volume respiratory fluid exhaled per unit time ii) developing novel dose-based generation rate dehydrated droplets after expiration iii) deriving quanta-RNA relationship various strains SARS-CoV-2 iv) proposing method account incomplete mixing conditions. These approaches considerably changed previous estimates allowed determine more accurate average quanta emission rates including omicron variant. values original strain 0.13 3.8 quanta/h breathing speaking virus variant multipliers be simple hand calculations probability or with developed operating six size ranges effect ventilation other mechanisms. The made available as an open-source tool.

Язык: Английский

---

Effectiveness of head-mounted air supply in reducing pollutant exposure: A static case

Building and Environment, Год журнала: 2023, Номер 234, С. 110219 - 110219

Опубликована: Март 17, 2023

Язык: Английский

---