CFD Analysis of Personal Ventilation with Volumetric Chemical Reactions

Russo, Jackie; Khalifa, H. Ezzat

doi:10.1080/10789669.2010.10390935

Cited by 12 publications

(5 citation statements)

References 28 publications

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“…Most of the numerical studies used CFD. Some researchers had used CFD to analyze the volumetric and surface reactions of ozone in indoor settings (Sørensen and Weschler, 2002; Russo and Khalifa, 2010; Russo and Khalifa, 2011), which proved the validity of the CFD method. In this study, CFD was used to study the ozone distribution and surface deposition under three different air-supply modes.…”

Section: Methodsmentioning

confidence: 96%

Evaluation of ozone risk under different air-supply mode in aircraft cabins

Zhibo

Han

Bai

2018

AEAT

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Purpose The purpose of this paper is to evaluate the ozone risk introduced by the mixing air-supply mode, displacement air-supply mode and personalized air-supply mode, respectively, in commercial aircraft cabins. Design/methodology/approach In this study, a computational fluid dynamics (CFD) model of aircraft cabin has been built to study the distribution of ozone mass fraction and the ozone surface deposition rate on passenger’s face and clothes under the three different air-supply modes, respectively. The distribution of ozone mass fraction has been obtained by calculating the mass concentration of ozone in different location. The ozone surface deposition rate on passenger’s face and clothes has been calculated according to the mechanism of the reactions between ozone and squalene, which is the primary reactant in human sebum. Findings By comparing the three air-supply modes, it was considered that the mixing air-supply mode made lower ozone concentration and ozone surface deposition risk in most area, but this was because of the thin air distribution in cabin. The displacement air-supply mode made an uneven distribution of ozone concentration and increased absorbing ozone risk in the breathing zone. The personalized air-supply mode was proper for avoiding ozone harm and making a comfortable air environment. The air supply from the inlet on seat back could not increase the ozone surface deposition risk on passenger’s face. Originality/value This paper provides the qualitative and quantitative analysis for ozone risk to the passengers under the different air-supply modes. Findings can provide some suggestions for the designers to optimize the air-supply mode of air distribution system for reducing passengers’ discomfort caused by high-altitude ozone introduction, such as breathing in too much ozone.

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Section: Methodsmentioning

confidence: 96%

Evaluation of ozone risk under different air-supply mode in aircraft cabins

Zhibo

Han

Bai

2018

AEAT

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“…A subsequent study provided another benchmark test case involving PV combined with a general ventilation system in a room from the experiment [178,179]. The latter test case has been applied in several publications [39,74,76,77,85]. Therefore, it is a useful database to compare simulated results with a PV benchmark test to validate new programs, turbulence models, grid dependency, and numerical schemes [30].…”

Section: Validationmentioning

confidence: 99%

A Review of CFD Analysis Methods for Personalized Ventilation (PV) in Indoor Built Environments

et al. 2019

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Computational fluid dynamics (CFD) is an effective analysis method of personalized ventilation (PV) in indoor built environments. As an increasingly important supplement to experimental and theoretical methods, the quality of CFD simulations must be maintained through an adequately controlled numerical modeling process. CFD numerical data can explain PV performance in terms of inhaled air quality, occupants’ thermal comfort, and building energy savings. Therefore, this paper presents state-of-the-art CFD analyses of PV systems in indoor built environments. The results emphasize the importance of accurate thermal boundary conditions for computational thermal manikins (CTMs) to properly analyze the heat exchange between human body and the microenvironment, including both convective and radiative heat exchange. CFD modeling performance is examined in terms of effectiveness of computational grids, convergence criteria, and validation methods. Additionally, indices of PV performance are suggested as system-performance evaluation criteria. A specific utilization of realistic PV air supply diffuser configurations remains a challenging task for further study. Overall, the adaptable airflow characteristics of a PV air supply provide an opportunity to achieve better thermal comfort with lower energy use based on CFD numerical analyses.

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“…The control over the characteristics of the personalized airflow and the airflow interaction at the breathing zone makes it possible to minimize the mixing of the supplied clean air with the polluted room air resulting in improved cleanness of the inhaled air (Russo and Khalifa, ). Depending on the design of AAD the inhaled air may consist of clean personalized air only (Melikov et al., ).…”

Section: Advantages Of Advanced Air Distributionmentioning

confidence: 99%

Advanced air distribution: improving health and comfort while reducing energy use

Melikov

2015

Indoor Air

141

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Indoor environment affects the health, comfort, and performance of building occupants. The energy used for heating, cooling, ventilating, and air conditioning of buildings is substantial. Ventilation based on total volume air distribution in spaces is not always an efficient way to provide high-quality indoor environments at the same time as low-energy consumption. Advanced air distribution, designed to supply clean air where, when, and as much as needed, makes it possible to efficiently achieve thermal comfort, control exposure to contaminants, provide high-quality air for breathing and minimizing the risk of airborne cross-infection while reducing energy use. This study justifies the need for improving the present air distribution design in occupied spaces, and in general the need for a paradigm shift from the design of collective environments to the design of individually controlled environments. The focus is on advanced air distribution in spaces, its guiding principles and its advantages and disadvantages. Examples of advanced air distribution solutions in spaces for different use, such as offices, hospital rooms, vehicle compartments, are presented. The potential of advanced air distribution, and individually controlled macro-environment in general, for achieving shared values, that is, improved health, comfort, and performance, energy saving, reduction of healthcare costs and improved well-being is demonstrated. Performance criteria are defined and further research in the field is outlined.

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CFD Analysis of Personal Ventilation with Volumetric Chemical Reactions

Cited by 12 publications

References 28 publications

Evaluation of ozone risk under different air-supply mode in aircraft cabins

Evaluation of ozone risk under different air-supply mode in aircraft cabins

A Review of CFD Analysis Methods for Personalized Ventilation (PV) in Indoor Built Environments

Advanced air distribution: improving health and comfort while reducing energy use

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