Abstract
In South Korea, the installation of a mechanical ventilation system is mandatory for the management of indoor air quality, and various studies concerning the ventilation rate and performance of the ventilation system have been conducted. However, only a few studies have been conducted regarding the recirculation rate of the ventilation system. If the appropriate arrangement of intake and exhaust vents in the ventilation system is not considered, the pollutants emitted from the circulation movement may be recirculated into the indoor environment and cause the degradation of the performance of the ventilation system. Therefore, this study aimed to quantitatively analyze the recirculation rate of pollutants emitted from a kindergarten building with an installed mechanical ventilation system in Seoul, South Korea, using computational fluid dynamics (CFD) analysis, and analyze the effectiveness of the guide panel installed for the prevention of the pollutants’ recirculation. The number of cases for the CFD analysis was set to a total of ten based on the ventilation rate in a mechanical ventilation system, external wind direction, and the existence of the guide panel for preventing the recirculation of exhaust air. The maximum recirculation rate of exhaust air without the installation of a guide panel was shown to be 20.0%. The maximum recirculation rate in the case where the external wind speed, direction of wind, and the ventilation rate were assumed to be identical to the other case but the guide panel for preventing the recirculation of exhaust air was assumed to be installed was 7.7%, 12.3% lower compared with the case with maximum recirculation rate.
Highlights
In modern society, with the increasing number of indoor activity hours of residents, the attention towards the necessity to manage indoor air quality and ventilation is rising.In addition, in East Asian countries including South Korea, rapid economic development and industrialization have led to a high concentration of air pollutants, regardless of the season [1,2]
Seoul,The this Cases study evaluated the recirculation rate of of exhaust of the ventilation system, and Figures 2 and 3 show the installation of the ventilation system and the geometry for Targeting a kindergarten building with a mechanical ventilation system located in Seoul, this study evaluated the recirculation rate of exhaust air of the ventilation system, and Figures 2 and 3 show the installation of the ventilation system and the geometry for computational fluid dynamics (CFD) analysis
Through the analysis performed before CFD analysis, the study determined that the effect of the CO2 diffusion coefficient on the recirculation rate would be negligible, so that the exhaust air emitted from the ventilation unit in each floor was considered to exhibit identical properties to that of external air, through which the study could quantitatively analyze the effect of
Summary
With the increasing number of indoor activity hours of residents, the attention towards the necessity to manage indoor air quality and ventilation is rising.In addition, in East Asian countries including South Korea, rapid economic development and industrialization have led to a high concentration of air pollutants, regardless of the season [1,2]. With the increasing number of indoor activity hours of residents, the attention towards the necessity to manage indoor air quality and ventilation is rising. In South Korea, the installation of mechanical ventilation systems in new apartment buildings with more than 100 households has been mandatory since 2016, such that the ventilation of 0.5 room volumes per h can supply fresh external air to indoor spaces and the indoor air quality can be guaranteed up to a certain level [4]. The mechanical ventilation system has become an essential, not an optional, component for the management of indoor air quality and is mandatory in new or remodeled houses, as well as facilities for the children and elderly.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
