Experimental Study Abour How the Thermal Plume Affects the Air Quality a Person Breathes

Inés Olmedo, Peter V. Nielsen, Manuel Ruiz de Adana, Piotr Grzelecki, Rasmus Lund Jensen

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review


The Personal Micro Environment (PME) depends directly on the heat transfer in the surrounding environment. For the displacement ventilation systems the convective transport mechanism, which is found in the thermal plume around a person, influences the human exposure to pollutants. The aim of this research is to increase the knowledge of how the thermal plume generated by a person affects the PME and therefore the concentration of contaminants in the inhalation area. An experimental study in a displacement ventilation room was carried out. Experiments were developed in a full scale test chamber 4.10 m (length), 3.2 m (width), 2.7 m (height). The incoming air is distributed through a wall-mounted displacement diffuser. A breathing thermal manikin exhaling through the mouth and inhaling through the nose was used. A tracer gas, N2O, was used to simulate the gaseous substances, which might be considered as biological contaminants, exhaled by the manikin. The manikin was operated in three different heat fluxes with a value of: 0W, 94 W and 120 W. During the experiments six concentration probes were situated in the room. Three concentration tubes were fixed on the surface of the manikin at three different heights: hips, chest and nose (inhalation). The three other tubes were situated in a vertical line at 0.50 m from the manikin and at the same three heights. The results show the highest concentration of contaminants around the manikin when the manikin heat load is fixed to 0W. However, the concentration is significantly reduced in the case with 120 W, especially in the breathing area.
Original languageEnglish
Title of host publicationRoomvent 2011
Number of pages6
PublisherTAPIR Akademisk Forlag
Publication date2011
ISBN (Print)978-82-519-2812-0
Publication statusPublished - 2011
EventRoomvent 2011 - Trondheim, Norway
Duration: 19 Jun 201122 Jun 2011
Conference number: 12


ConferenceRoomvent 2011


Bibliographical note

Published on a USB.


  • Thermal Plumes
  • Manikin
  • Displacement Ventilation
  • Tracer Gas

Cite this

Olmedo, I., Nielsen, P. V., Ruiz de Adana, M., Grzelecki, P., & Jensen, R. L. (2011). Experimental Study Abour How the Thermal Plume Affects the Air Quality a Person Breathes. In Roomvent 2011 TAPIR Akademisk Forlag.