Fluid dynamic and thermal comfort analysis in an actual operating room with unidirectional airflow system

Massarotti, Nicola; Mauro, Alessandro; Mohamed, Salahudeen; Nowak, Andrzej J.; Sainas, Domenico

doi:10.1007/s12273-020-0713-3

Cited by 13 publications

(2 citation statements)

References 43 publications

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“…It was not surprising to find these results. Many studies indicated that flow field play an important role to reduce the diffusion of particles (Liu et al 2020;Lv et al 2021;Massarotti et al 2021). However, the robustness of the flow field could not completely determine the distribution of particles.…”

Section: Analysis Of Ventilation System Robustnessmentioning

confidence: 99%

Robustness of ventilation systems in the control of walking-induced indoor fluctuations: Method development and case study

Ren

Kong

et al. 2022

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Walking-induced fluctuations have a significant influence on indoor airflow and pollutant dispersion. This study developed a method to quantify the robustness of ventilation systems in the control of walking-induced fluctuation control. Experiments were conducted in a full-scale chamber with four different kinds of ventilation systems: ceiling supply and side return (CS), ceiling supply and ceiling return (CC), side supply and ceiling return (SC), and side supply and side return (SS). The measured temperature, flow and pollutant field data was (1) denoised by FFT filtering or wavelet transform; (2) fitted by a Gaussian function; (3) feature-extracted for the range and time scale disturbance; and then (4) used to calculate the range scale and time scale robustness for different ventilation systems with dimensionless equations developed in this study. The selection processes for FFT filtering and wavelet transform, FFT filter cut-off frequency, wavelet function, and decomposition layers are also discussed, as well as the threshold for wavelet denoising, which can be adjusted accordingly if the walking frequency or sampling frequency differs from that in other studies. The results show that for the flow and pollutant fields, the use of a ventilation system can increase the range scale robustness by 19.7%-39.4% and 10.0%-38.8%, respectively; and the SS system was 7.0%-25.7% more robust than the other three ventilation systems. However, all four kinds of ventilation systems had a very limited effect in controlling the time scale disturbance.

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Section: Analysis Of Ventilation System Robustnessmentioning

confidence: 99%

Robustness of ventilation systems in the control of walking-induced indoor fluctuations: Method development and case study

Ren

Kong

et al. 2022

Build. Simul.

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“…However, many past studies focusing on airborne transmission were limited to the steady-state conditions by the two-equation Reynolds-averaged Navier-Stokes (RANS) turbulence models. In computational fluid dynamics (CFD) context, the numerical simulation has been widely employed to study the transmission in different scenarios like the hospitals [8,9], office rooms [10][11][12], vehicles [13][14][15], and aircraft cabins [16,17]. The aforementioned limitation of low time-resolution studies posts a need to explore the dynamic process of the transmission of exhaled particles.…”

Section: Introductionmentioning

confidence: 99%

Airborne transmission during short-term events: Direct route over indirect route

et al. 2022

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Numerous short-term exposure events in public spaces were reported during the COVID-19 pandemic, especially during the spread of Delta and Omicron. However, the currently used exposure risk assessment models and mitigation measures are mostly based on the assumption of steady-state and complete-mixing conditions. The present study investigates the dynamics of airborne transmission in short-term events when a steady state is not reached before the end of the events. Large-eddy simulation (LES) is performed to predict the airborne transmission in short-term events, and three representative physical distances between two occupants are examined. Both timeaveraged and phase-averaged exposure indices are used to evaluate the exposure risk.The results present that the exposure index in the short-term events constantly varies This is the Pre-Published Version.

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Is thermal-guided mobile air supply a practical measure in burn isolation wards? Potential future applications

Kek,

Tan,

Othman

et al. 2024

J Therm Anal Calorim

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Fluid dynamic and thermal comfort analysis in an actual operating room with unidirectional airflow system

Cited by 13 publications

References 43 publications

Robustness of ventilation systems in the control of walking-induced indoor fluctuations: Method development and case study

Robustness of ventilation systems in the control of walking-induced indoor fluctuations: Method development and case study

Airborne transmission during short-term events: Direct route over indirect route

Is thermal-guided mobile air supply a practical measure in burn isolation wards? Potential future applications

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