Experimental study of the heat transfers and passive cooling potential of a ventilated plenum designed for uniform air distribution

Christian Anker Hviid, Julian Lessing

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    Abstract

    suspended ceiling to uniformly distribute the supply air to the occupied zone. This, in effect, increases the thermal mass of the room because the upper slab of the room no longer is isolated from the occupied zone.
    In this study, the cooling potential of a diffuse ceiling ventilation system is
    investigated by experiments focused toward characterizing the convective heat
    transfer of the plenum. The heat transfers are quantified from four different air flow rates, the temperature of the air supplied to the plenum and the mean surface temperature, i.e. the total heat transfer coefficient of the plenum.
    The established heat transfer coefficient is used for analysis of the cooling performance of the system in dynamic building simulation program which showed that during peak summer days, the scenario with ventilated plenum would exhibit temperatures in the occupied zone approx. 1-1.5 °C lower than the baseline with unventilated plenum.
    In conclusion this study disclosed the mean heat transfer of the plenum with an inlet jet of approx. 1.2-0.4 m/s and temperature differences of 0.5-4.5 °C and showed that ventilation supply through the plenum can be used to augment the night cooling potential.
    Original languageEnglish
    Title of host publicationCLIMA 2016 - proceedings of the 12th REHVA World Congress
    Number of pages10
    Publication date2016
    Publication statusPublished - 2016
    Event12th REHVA World Congress CLIMA 2016 - Aalborg, Denmark
    Duration: 22 May 201625 May 2016

    Conference

    Conference12th REHVA World Congress CLIMA 2016
    Country/TerritoryDenmark
    CityAalborg
    Period22/05/201625/05/2016

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