Effect of Geometric Parameters on Ventilation Performance in a Dry Room

Lee, Kwan-Soo; Choi, Seokho

doi:10.1081/drt-120005861

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…All classrooms are rectangular shape and have openings for cross ventilation, described as the best approach to natural ventilation. Slight differences in the dimensions, shape and configuration of openings may influence the ventilation efficiency ( Chenvidyakarn and Woods, 2005 ; Lee and Choi, 2002 ), but since all classrooms are cross-ventilated and similar in shape, this aspect was not considered in the work. Windows face north, opening to the outside where there is a one-storey building in the immediate vicinity.…”

Section: Methodsmentioning

confidence: 99%

Ventilation conditions and their influence on thermal comfort in examination classrooms in times of COVID-19. A case study in a Spanish area with Mediterranean climate

Miranda

Romero

Valero-Amaro

et al. 2022

International Journal of Hygiene and Environmental Health

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Section: Methodsmentioning

confidence: 99%

Ventilation conditions and their influence on thermal comfort in examination classrooms in times of COVID-19. A case study in a Spanish area with Mediterranean climate

Miranda

Romero

Valero-Amaro

et al. 2022

International Journal of Hygiene and Environmental Health

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“…However, air infiltration in buildings is usually not considered as part of the design of the ventilation system [1]. This causes a non-predictive air track model that entails an inhomogeneous air quality distribution through the indoor space, whose impact depends on the occupants' location [28]. The distribution of the air quality can be evaluated by assessing the ventilation efficiency and age of the air [29], which can be modeled by knowing the air infiltration rate and the position of the air leakage paths using Computational Fluid Dynamics (CFD) software.…”

Section: Introductionmentioning

confidence: 99%

Impact of Air Infiltration on IAQ and Ventilation Efficiency in Higher Educational Classrooms in Spain

et al. 2021

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Indoor air quality (IAQ) in educational buildings is a key element of the students’ well-being and academic performance. Window-opening behavior and air infiltration, generally used as the sole ventilation sources in existing educational buildings, often lead to unhealthy levels of indoor pollutants and energy waste. This paper evaluates the conditions of natural ventilation in classrooms in order to study how climate conditions affect energy waste. For that purpose, the impact of the air infiltration both on the IAQ and on the efficiency of the ventilation was evaluated in two university classrooms with natural ventilation in the Continental area of Spain. The research methodology was based on site sensors to analyze IAQ parameters such as CO2, Total Volatile Organic Compounds (TVOC), Particulate Matter (PM), and other climate parameters for a week during the cold season. Airtightness was then assessed within the classrooms and the close built environment by means of pressurization tests, and infiltration rates were estimated. The obtained results were used to set up a Computational Fluid Dynamics (CFD) model to evaluate the age of the local air and the ventilation efficiency value. The results revealed that ventilation cannot rely only on air infiltration, and, therefore, specific controlled ventilation strategies should be implemented to improve IAQ and to avoid excessive energy loss.

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“…9 discovered that the position of the inlet opening was more important than that of the outlet. Lee and Choi 10 studied four different positions for outlet openings, the aspect ratio of the horizontal section and the type of ventilation, determining that the air change efficiency reached its higher value when the aspect ratio was 1:4, and that the arrangement of the outlet openings at higher positions achieved better efficiencies. Hassan et al.…”

Section: Introductionmentioning

confidence: 99%

Effects of the radiant heating system location on both the airflow and ventilation efficiency in a room

Rabanillo-Herrero

Padilla-Marcos

Feijó-Muñoz

et al. 2018

Indoor and Built Environment

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The effect of temperature of the heating system elements is a parameter that could affect the airflow in terms of buoyancy and thermal comfort and that should be studied to ensure the quality of ventilation. This study aimed to assess the air change efficiency and thermal comfort with three thermal conditioning systems (radiators, underfloor heating and radiant ceiling) in winter conditions, varying its position in the interior space. This can be used by architects and engineers when planning the position of the heating systems or refurbishing a room. The experimental analysis was developed in the test chamber of the Laboratory of Ventilation of the University of Valladolid, serving as validation of multiple CFD simulations. The results show that, being the thermal comfort achieved, the mean air change efficiency varied only 2.40% among all cases, which makes this factor not significant. Even so, the trajectory of the airflow in the premise would be affected by the thermal action, due to the convective effect, presenting great differences according to the location of the thermal systems. Thus, the air trajectory could falter when it enters the room or rise towards the ceiling creating areas with lower temperature in its centre.

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Effect of Geometric Parameters on Ventilation Performance in a Dry Room

Cited by 9 publications

References 5 publications

Ventilation conditions and their influence on thermal comfort in examination classrooms in times of COVID-19. A case study in a Spanish area with Mediterranean climate

Ventilation conditions and their influence on thermal comfort in examination classrooms in times of COVID-19. A case study in a Spanish area with Mediterranean climate

Impact of Air Infiltration on IAQ and Ventilation Efficiency in Higher Educational Classrooms in Spain

Effects of the radiant heating system location on both the airflow and ventilation efficiency in a room

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