Comparing mixing and displacement ventilation in classrooms: pupils’ perception and health

Smedje, Greta; Mattsson, Magnus; Wålinder, Robert

doi:10.1111/j.1600-0668.2011.00725.x

Cited by 17 publications

(28 citation statements)

References 29 publications

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“…Second, several IAQ constituents have demonstrated diurnal and seasonal variation, complicating exposure assessment strategies. Third, school IAQ is dependent on multiple construction factors and school location . Further, occupants may be the source of biological pollutants in schools .…”

Section: Literature Reviewmentioning

confidence: 99%

“…Further, occupants may be the source of biological pollutants in schools . Subjective perception of air quality, rather than objective air quality measures, may play a greater role in occupants' health and performance . In terms of the social milieu of the school, school climate has been challenging to define and measure; there is no consensus operationalization or widely accepted standardized tool to assess school climate .…”

Section: Literature Reviewmentioning

confidence: 99%

See 1 more Smart Citation

A Multidisciplinary Research Framework on Green Schools: Infrastructure, Social Environment, Occupant Health, and Performance

Magzamen

Mayer

Barr

et al. 2017

Journal of School Health

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Given the average age of current school facilities in the United States, construction of new school facilities or retrofits of older facilities will be a major infrastructure investment for many municipalities over the next several decades. Multidisciplinary research that seeks to understand the impact of sustainable design on the health and performance of occupants will need to include both an environmental science and social science perspective to inform best practices and quantification of benefits that go beyond general measures of costs savings from energy efficiencies.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

A Multidisciplinary Research Framework on Green Schools: Infrastructure, Social Environment, Occupant Health, and Performance

Magzamen

Mayer

Barr

et al. 2017

Journal of School Health

View full text Add to dashboard Cite

show abstract

“…In the 2004 study, none of these variables is reported as significant. Other researchers obtained significant results between CO 2 reduction and the perception of air quality, specifically in connection with the freshness of the air, the perception of lower temperatures, increased perception of air movement and decreased perception of odors [14,[40][41][42][43].…”

Section: Co 2 Effects On the Perception Of Comfortmentioning

confidence: 99%

Perception of Cabin Air Quality among Drivers and Passengers

et al. 2016

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Air analysis inside vehicles is a problem that can be interpreted from several perspectives. This research is oriented towards the perception of air quality within a car, regarding a situation of cars in stationary traffic. Carbon dioxide measurements were made using a Trotec Data Logger Air Quality CO 2 BZ30 machine inside different standing vehicles with up to five occupants, with and without circulating air. The perception of the air quality was measured on a Likert-type scale with seven levels on a sample group of 60 students. The results highlight, on the one hand, the conditions under which the CO 2 in the cabin air can reach concentrations which are, according to new data, considered to influence the cognitive capacity of occupants in the car, and on the other hand, they present a global assessment of the air quality in the vehicle when critical values of CO 2 have been reached. If the air exchange rates inside a car are low, this degrades the air quality in such a way that it affects the concentration and reactions necessary for safe driving without perceiving any discomfort that would put the drivers or the passengers on alert.

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“…The interest in optimizing DV systems in classrooms and lecture rooms is mainly because of the fact that DV possesses the advantage of low noise, due to having low speed air supply, which is optimal for classroom use 9 . The connection between indoor air quality and students' health and academic performance as proved by multiple studies factors in as well 10,11 . Wachenfeldt et al.…”

Section: Introductionmentioning

confidence: 99%

“…recommended that CO 2 concentration should be kept below 1000 ppm at 1.2 m height 11 . However, it is noticed that school classroom, 8,10,11,12,13 is more widely studied than university lecture halls 14,15 . The reason is believed to be that children are more vulnerable to low indoor air quality 10 …”

Section: Introductionmentioning

confidence: 99%

Effect of source location on contaminant dispersion pattern and occupants inhaled air quality in lecture room under displacement ventilation

Essa

Yamanaka

Kobayashi

et al. 2022

Japan Architectural Review

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Displacement ventilation (DV) is considered an energy saving air conditioning system and is especially recommended for classrooms for providing cool clean air in the occupied zone. However, in the current pandemic situation, ventilation systems should be assessed in terms of infection‐spread prevention as well. Hence, this study aims at assessing the efficiency of displacement ventilation in minimizing infection spread in lecture halls through investigating the effect of source position on the contaminant concentration distribution. The settings of a mid‐size DV lecture hall in Osaka University, Japan was chosen as a case‐study. Ten single‐contaminant‐source cases were simulated using CFD software. The cases were analyzed in terms of temperature distribution, contaminant diffusion pattern and vertical distribution, and breathing air quality using indices, such as local air quality index and scale of ventilation efficiency. The results demonstrated a considerable variation between cases in terms of contaminant distribution pattern, number of occupants affected, average inhaled‐air quality, and diffusion radius. Accordingly, given the ventilation system design, best and worst case‐scenarios were pointed out and factors affecting the variation were highlighted and further investigated to conclude the impact of each factor.

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Comparing mixing and displacement ventilation in classrooms: pupils’ perception and health

Abstract: Both mixing and displacement ventilation may be appropriate in school classrooms as long as the overall design, ventilation rates, and maintenance of systems are satisfactory.

Cited by 17 publications

References 29 publications

A Multidisciplinary Research Framework on Green Schools: Infrastructure, Social Environment, Occupant Health, and Performance

A Multidisciplinary Research Framework on Green Schools: Infrastructure, Social Environment, Occupant Health, and Performance

Perception of Cabin Air Quality among Drivers and Passengers

Effect of source location on contaminant dispersion pattern and occupants inhaled air quality in lecture room under displacement ventilation

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