Experimental study of diffuse ceiling ventilation in classroom

Christian Anker Hviid, Søren Terkildsen

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Diffuse ceiling ventilation is a novel air distribution device that combines the suspended acoustic ceiling with ventilation supply. A diffuse ceiling distributes the supply air above the acoustic tiles and has proven performance in laboratory experiments. To study the performance in real conditions a classroom was retrofitted with mechanical ventilation and a diffuse ceiling. The employed ceiling comprises active panels penetrable to air and impenetrable passive panels. The performance was studied with regard to air movements, temperatures and air change efficiency at two different air changes. The experiments were carried out during class to obtain realistic conditions. At both airflows did the ceiling perform satisfactorily with air movements and temperatures within the requirements of indoor climate standards. The air change efficiency is comparable to conventional mixing ventilation.
Original languageEnglish
Publication date2012
Number of pages10
Publication statusPublished - 2012
Event33rd AIVC conference – 2nd TightVent conference: Optimising Ventilative Cooling and Airtightness for [Nearly] Zero-Energy Buildings, IAQ and Comfort - Copenhagen, Denmark
Duration: 10 Oct 201211 Oct 2012


Conference33rd AIVC conference – 2nd TightVent conference
Internet address


  • Diffuse ceiling ventilation
  • Ventilation efficiency
  • Ventilation
  • Draught rating
  • Tracer gas


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