Predicting non-uniform indoor air quality distribution by using pulsating air supply and SVM model

Tian, Xue; Zhang, Yuchun

doi:10.1016/j.buildenv.2022.109171

Cited by 14 publications

(4 citation statements)

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“…( 1) is based on the assumption that the indoor air is well mixed, which is reasonably acceptable for the widely used air distribution, i.e., mixing ventilation (Rudnick and Milton 2003;Zhang et al 2021a;Lu et al 2022a). For non-uniform air distribution (Tian et al 2022), the contaminant removal efficiency can be introduced to indicate the non-uniform indoor contaminant distribution (Sun and Zhai 2020), which is not the focus of this study.…”

Section: Brief Introduction Into Occupancy-aided Ventilation Methodsmentioning

confidence: 99%

“…Under this scenario, the targeted working productivity is the prerequisite, and the lower airborne infection risk indicates better effectiveness. The widely used airborne infection risk index (Tian et al 2022), i.e., rebreathed fraction, is adopted. The rebreathed fraction is defined as the proportion of exhaled air in the inhaled air (Li et al 2022).…”

Section: Scenarios For Effectiveness Evaluation Of Occupancyaided Ven...mentioning

confidence: 99%

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Occupancy-aided ventilation for airborne infection risk control: Continuously or intermittently reduced occupancies?

2022

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Ventilation is an important engineering measure to control the airborne infection risk of acute respiratory diseases, e.g., Corona Virus Disease 2019 (COVID-19). Occupancy-aided ventilation methods can effectively improve the airborne infection risk control performance with a sacrifice of decreasing working productivity because of the reduced occupancy. This study evaluates the effectiveness of two occupancy-aided ventilation methods, i.e., the continuously reduced occupancy method and the intermittently reduced occupancy method. The continuously reduced occupancy method is determined by the steady equation of the mass conservation law of the indoor contaminant, and the intermittently reduced occupancy method is determined by a genetic algorithm-based optimization. A two-scenarios-based evaluation framework is developed, i.e., one with targeted airborne infection risk control performance (indicated by the mean rebreathed fraction) and the other with targeted working productivity (indicated by the accumulated occupancy). The results show that the improvement in the airborne infection risk control performance linearly and quadratically increases with the reduction in the working productivity for the continuously reduced occupancy method and the intermittently reduced occupancy method respectively. At a given targeted airborne infection risk control performance, the intermittently reduced occupancy method outperforms the continuously reduced occupancy method by improving the working productivity by up to 92%. At a given targeted working productivity, the intermittently reduced occupancy method outperforms the continuously reduced occupancy method by improving the airborne infection risk control performance by up to 38%.

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Section: Brief Introduction Into Occupancy-aided Ventilation Methodsmentioning

confidence: 99%

Section: Scenarios For Effectiveness Evaluation Of Occupancyaided Ven...mentioning

confidence: 99%

Occupancy-aided ventilation for airborne infection risk control: Continuously or intermittently reduced occupancies?

2022

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“…It is used in sensor-based monitoring systems to increase the accuracy and efficiency of odor quality assessments in outdoor environments (Wu et al, 2021). Based on the odor index, an accuracy of up to 95% was obtained with the MLP algorithm in estimating indoor air quality (Chang & Lin, 2020). Also, this method is efficient and cost-effective for monitoring indoor air quality.…”

Section: Odormentioning

confidence: 98%

Evolution of interior space design criteria on the quality of urban environment: Literature review

Şimşek,

Erkan,

Diker

et al. 2023

DRArch

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Efforts to increase the quality of this environment have been going on since the beginning of the concern for shelter in the history of humanity. The main targets of the user, designers, practitioners, and decision-makers are to carry the quality of life, health, safety, and welfare of individuals and other living things to the next level. Problems have been identified to increase the function and quality of the space, spatial requirements have been determined, and researched, and some design factors have been determined to reach the most appropriate solution. The researchers focused on the proposition that the effectiveness of these factors before and during the design process would increase the quality of the space. However, since research generally focuses on indoor quality, the outdoor quality factors that are part of urban design are not clear. This work, was designed to evaluate the usability of these factors, which were determined and measured especially to deal with the interior, in designs at larger scales (street, neighborhood, city…) and to improve the existing. In designs outside the spatial scale, where almost all factors can be controlled by the relevant stakeholders of the process, the subject is approached through changeable and unchangeable parameters and their balancing. Studies on the factors determined during the process were compiled and their effects on different scales were evaluated as a result of these compilations. As a result of the evaluation, some suggestions were given. In the process of redesigning the space, selecting feasible suggestions, and incorporating them into the creation of the future physical space, using the suggestions as urban rehabilitation tools, and considering these interventions to be flexible and suitable for various factors are of great importance for the psychology of the users.

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“…In contrast to residential and office structures, individuals are more likely to exit unfavorable indoor environments in retail establishments [6]. Because humans spend so much time inside, indoor air quality (IAQ) significantly impacts human health and has received a great deal of attention in recent decades [7][8][9][10][11][12][13]. Indoor environments expose individuals to a range of air pollutants, including various size fractions of particulate matter (PM1, PM2.5, PM10) and gaseous pollutants such as carbon monoxide (CO), carbon dioxide (CO 2 ), nitrogen dioxide (NO 2 ), ozone (O 3 ), sulfur dioxide (SO 2 ), and volatile organic compounds (VOCs).…”

Section: Introductionmentioning

confidence: 99%

Variability of Air Pollutants in the Indoor Air of a General Store

Tepeneu,

Lupitu,

Surdea-Blaga

et al. 2023

Applied Sciences

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This research investigates different facets of indoor air quality and the corresponding health symptoms within a retail environment. Formaldehyde, classified as a Group B carcinogenic substance, was found within safe limits indoors, primarily originating from surface coatings, flooring products, textiles, and furniture. Monoterpenes, lactic acid, and particulate matter levels were also assessed, with varying indoor–outdoor ratios. Notably, we identified a relatively low concentration of PM2.5, possibly influenced by enhanced cleaning practices during the COVID-19 pandemic. Symptom assessment revealed that many young workers experienced work-related symptoms, notably fatigue, nose-, throat-, and skin-related issues, aligning with previous findings. Although we could not conclusively link these symptoms to sick building syndrome (SBS) or formaldehyde exposure, it underscores the importance of further investigation. Notably, we observed no gender-based differences in symptom prevalence, but this study’s limited size requires caution in generalization. This study contributes to understanding indoor air quality and associated symptoms in an economically significant sector, emphasizing the need for continued research, especially considering the potential impact on workforce health in the broader context.

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Predicting non-uniform indoor air quality distribution by using pulsating air supply and SVM model

Cited by 14 publications

References 53 publications

Occupancy-aided ventilation for airborne infection risk control: Continuously or intermittently reduced occupancies?

Occupancy-aided ventilation for airborne infection risk control: Continuously or intermittently reduced occupancies?

Evolution of interior space design criteria on the quality of urban environment: Literature review

Variability of Air Pollutants in the Indoor Air of a General Store

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