Why do ventilation strategies matter in controlling infectious airborne particles? A comprehensive numerical analysis in isolation ward

Building and Environment, Год журнала: 2023, Номер 231, С. 110048 - 110048

Опубликована: Янв. 26, 2023

Язык: Английский

---

Particle dispersion for indoor air quality control considering air change approach: A novel accelerated CFD-DNN prediction

Energy and Buildings, Год журнала: 2024, Номер 306, С. 113938 - 113938

Опубликована: Янв. 26, 2024

Язык: Английский

---

A study on contaminant leakage from Airborne Infection Isolation room during medical staff entry; Implementation of walking motion on hypothetical human model in CFD simulation

Journal of Building Engineering, Год журнала: 2024, Номер 86, С. 108812 - 108812

Опубликована: Фев. 21, 2024

The recent outbreak of respiratory infectious diseases such as Middle East Respiratory Syndrome (MERS) and Coronavirus Disease-19 (COVID-19) highlights the critical role Air Infection Isolation (AII) rooms in preventing spread disease. However, risk contaminant leakage from AII room during medical staff interactions remains a significant challenge. This study advances our understanding by employing Computational Fluid Dynamics (CFD) simulations with novel approach. While CFD mitigate some limitations field experiments, measurement resolution variable changes, their accuracy is often limited oversimplification models, particularly representing human models movement. Unlike prior studies, we incorporate minimal simplification, featuring model Personal Protective Equipment (PPE) realistic walking motions. explores four distinct scenarios varied movements, offering comprehensive analysis airflow dispersion rooms. results indicated differences patterns distribution when motion was implemented model, opposed to simplified movement models. ranged 20.6 % 28.6 %, suggesting that studies may underestimate infection risks due oversimplified These findings underscore importance implementing motions for accurate assessment Additionally, opens pathways future research explore more complex clinical settings, enhancing control strategies.

Язык: Английский

---

Ventilation strategies for mitigating airborne infection in healthcare facilities: A review and bibliometric analysis (1993–2022)

Energy and Buildings, Год журнала: 2023, Номер 295, С. 113323 - 113323

Опубликована: Июнь 28, 2023

Язык: Английский

---

Numerical study of airflow pattern and bioaerosol dispersion during door motion in a negative pressure isolation ward

Journal of Building Engineering, Год журнала: 2024, Номер 89, С. 109351 - 109351

Опубликована: Апрель 17, 2024

Язык: Английский

---

Utilising localised exhaust and air curtain to reduce airborne particle settlement on surgical patients: potential future application in operating rooms?

Journal of Thermal Analysis and Calorimetry, Год журнала: 2024, Номер 149(19), С. 11323 - 11336

Опубликована: Апрель 23, 2024

Язык: Английский

---

Spatial and temporal distribution of bioaerosols produced by patients with different postures in a negative pressure isolation ward under different ventilation modes

Indoor and Built Environment, Год журнала: 2024, Номер 33(5), С. 895 - 915

Опубликована: Янв. 9, 2024

The high concentration of viral bioaerosols within the negative pressure isolation wards could pose a challenge to preventing potential cross-infection amongst healthcare workers (HCWs) and patients. Using Euler–Lagrange methodology, this study numerically simulated spatial temporal distribution characteristics in typical ward as well determined interaction ventilation mode patient posture on performance. removal effect particle groups produced by two respiratory behaviours (breathing coughing) was quantitatively analyzed, exhaust air ratio exchange rate discussed. results showed that migration bioaerosol particles were sensitive both pattern posture, which significant interactions. On basis, with best performance evaluated, showing 70–85%. Due initial momentum difference, diffusion behaviour cough breath not consistent, but optimizing airflow near outlet improve their efficiency meantime. Further studies found equal velocity facilitated aerosol particles, an appropriate increase also reduce content.

Язык: Английский

---

A CFD assessment on ventilation strategies in mitigating healthcare-associated infection in single patient ward

Progress in Energy and Environment, Год журнала: 2023, Номер 24(1), С. 35 - 45

Опубликована: Март 27, 2023

A promising ventilation strategy is an effective measure to enhance indoor air quality and protect the patients against healthcare-acquired infection. The Computational Fluid Dynamics (CFD) model represents a patient ward that was constructed using Computer-Aided Design (CAD) software. simulated results were verified validated based on published data. Renormalization Group (RNG) k-epsilon Eulerian approach used simulate airflow turbulence, while discrete phase (DPM) Lagrangian predict dispersion of airborne particles. This study examined four cases strategies, with varying rates, positioning supply diffusers, location exhaust grilles. revealed installation curtain jet coupled ceiling-mounted diffuser (case 3) above patient-occupying zone has highest wiping efficiency infectious utilization in case 3 managed reduce particle by approximately 3.3 times as compared baseline case. outcome also suggested grilles should be placed upper wall, ensure proper mixing fresh entire ward.

Язык: Английский

---

Review on respiratory infectious disease transmission mechanism: effects of human movement and facemask use

Emergency Management Science and Technology, Год журнала: 2024, Номер 4(1), С. 0 - 0

Опубликована: Янв. 1, 2024

Respiratory infectious diseases can cause public health emergencies, threatening human well-being, social operation, and economic development. Clarifying the transmission mechanism of respiratory is essential for control measures. We review main research findings on in recent decades. The source characteristics diseases, airborne mechanism, exposure susceptible persons, infection risk assessment methods are discussed. Given that dynamic scenario disease has attracted wide attention years, we summarize effects movement indoor airflow, pathogen diffusion, exposure. Considering everyday use facemasks, facemasks also Finally, future prospects proposed. be comprehensively explored by delving into patients' pathological personnel protection This exploration facilitated establishing a multi-pose manikin database, enabling personalized refined evaluations. Interdisciplinary cooperation will play pivotal role fostering holistic understanding. Furthermore, it crucial to account impact individuals' activity patterns dynamics. expected reference emergency management.

Язык: Английский

---

On the effects of walking speed, crowd density and human-to-source distance on pollutant dispersion in indoor spaces

Building and Environment, Год журнала: 2024, Номер 259, С. 111649 - 111649

Опубликована: Май 16, 2024

The effects of walking speed, crowd density and human-to-source distance on pollutant dispersion in two scaled room models are investigated using simultaneous planar laser-induced fluorescence particle-image velocimetry techniques. For a small 3 m high room, where the length-scales people comparable, motions significantly influenced macro mean flow patterns. This has strong effect scalar properties as magnitudes advective fluxes often comparable or larger than turbulent fluxes. As such, case specific. large 9 motion only local field. increase speed improves efficiency which is transported mixed with fresh ambient fluid out measurement plane (i.e. along direction motion), leading to scalar-free zones observed opposite side from ventilation outlet. area zone increases an density. more sensitive human components, mixing improves, show greater weakening increased source. concentration PDFs near-source region can be described by exponential function expected value at 99% percentile derived C99/crms′=4.61, agreed well experimental measurements 4.1 5.9.

Язык: Английский

---