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Accessing the thermal mass above suspended ceilings via a perimeter gap : A CFD study of naturally ventilated spaces


Reference:

Morey, S., Coley, D. A. and Kershaw, T. J., 2010. Accessing the thermal mass above suspended ceilings via a perimeter gap : A CFD study of naturally ventilated spaces. International Journal of Ventilation, 9 (2), pp. 163-175.

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    Official URL:

    http://www.ijovent.org/doi/abs/10.5555/ijov.2010.9.2.163

    Abstract

    There is a growing desire to reduce peak temperatures within non-domestic buildings by accessing the thermal mass of separating floors. These floors are typically formed of concrete and can store reasonable amounts of heat. Unfortunately, they are usually thermally isolated from the room below by a suspended ceiling. Therefore, some architects try to access the concrete by leaving a perimeter gap in the suspended ceiling in each room to allow airflow across the underside of the separating floor. For visual and acoustic reasons, there is the desire to make this gap as small as possible. Using computational fluid dynamics we examine the relationship between gap size and airflow above the suspended ceiling for naturally ventilated spaces. We show that although the precise details of the airflow depends on the size of the room, levels of incidental gains, ventilation rates and the location of heat sources, in all cases increasing the perimeter width within realistic bounds results in a linear increase in the mean tangential speed of airflow across the underside of the ceiling. This is common for both single sided and cross ventilated rooms and for both single and double raft designs; however, the double raft design performs significantly better.

    Details

    Item Type Articles
    CreatorsMorey, S., Coley, D. A. and Kershaw, T. J.
    DOI10.5555/ijov.2010.9.2.163
    DepartmentsFaculty of Engineering & Design > Architecture & Civil Engineering
    RefereedYes
    StatusPublished
    ID Code25102

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