Impact of Thermal Plumes Generated by Occupant Simulators with Different Complexity of Body Geometry on Airflow Pattern in Rooms

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Abstract

The impact of thermal plumes generated by human body simulators with different geometry on the airflow pattern in a full scale room with displacement ventilation (supply air temperature 21.6°C, total flow rate 80 L/s) was studied when two seated occupants were simulated first by two thermal manikins resembling accurately human body shape and then by two heated cylinders. The manikins and the cylinders had the same surface area of 1.63 m2 and the same heat generation of 73 W. CO2 supplied from the top of the heat sources was used for simulating bio-effluents. CO2 concentration was measured at 16 heights in 9 locations and at 20 points in a horizontal plane 0.2 m below the ceiling. The thermal plumes generated by the manikins had greater volume flux than the plumes above the cylinders and it equalled the supply airflow rate at a lower height than in the case with cylinders. This resulted in substantially different vertical CO2 concentration distributions in the room. In the lower “cleaner” zone the CO2 concentration was higher when the occupants were simulated by the thermal manikins than when simulated with the cylinders. The results reveal that simulation of occupants by objects with simplified geometry, such as cylinders, is insufficient for obtaining accurate results when studying airflow in rooms with displacement ventilation.
Original languageEnglish
Title of host publicationProceedings of the 7th International Thermal Manikin and Modelling Meeting – 7I3M
Number of pages8
Place of PublicationCoimbra, Portugal
Publication date2008
Publication statusPublished - 2008
Event7th International Thermal Manikin and Modelling Meeting - Coimbra, Portugal
Duration: 3 Sep 20085 Sep 2008
Conference number: 7
http://www.adai.pt/7i3m/

Conference

Conference7th International Thermal Manikin and Modelling Meeting
Number7
CountryPortugal
CityCoimbra
Period03/09/200805/09/2008
Internet address

Keywords

  • tracer gas technique
  • office
  • heated cylinder
  • thermal plume
  • thermal manikin
  • displacement ventilation

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