Interaction of convective flow generated by human body with room ventilation flow: impact on transport of pollution to the breathing zone

Dusan Licina, Arsen Krikor Melikov, Chandra Sekhar, Kwok Wai Tham

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Abstract

This study aims to investigate the interaction between the human convective boundary layer (CBL) and uniform airflow from two directions and with different velocities. The study has two objectives: first, to characterize the velocity field in the breathing zone of a thermal manikin under its interaction with opposing flow from above and assisting flow from below; and secondly, implication of such a flow interaction on the particle transport from the feet to the breathing zone is examined. The results reveal that the human body heat transports the pollution to the breathing zone and increases concentration by factor of 5.5. Downward flow of 0.175 m/s does not change airflow patterns and pollutant concentration in the breathing zone, while the velocity of 0.425 m/s offsets the thermal plume and minimizes the concentration. Since the downward flow at 0.30 m/s collides with the CBL at the forehead level, it prolongs particle dwell time and consequently, increases the concentration in the breathing zone by 106%. Adding the assisting flow dilutes the pollution and reduces the concentration compared to case of a pure CBL. Findings that the assisting flow of 0.30 m/s and above reduces the velocity in the breathing zone due to the blocking effect of the chair suggest that furniture should be carefully considered in numerical results predictions and optimal air distribution.
Original languageEnglish
Title of host publicationProceedings of Indoor Air 2014
Number of pages8
PublisherInternational Society of Indoor Air Quality and Climate
Publication date2014
Article numberHP0127
Publication statusPublished - 2014
Event13th International Conference on Indoor Air Quality and Climate - University of Hong Kong, Hong Kong, Hong Kong
Duration: 7 Jul 201412 Jul 2014
Conference number: 13
http://www.indoorair2014.org/

Conference

Conference13th International Conference on Indoor Air Quality and Climate
Number13
LocationUniversity of Hong Kong
CountryHong Kong
CityHong Kong
Period07/07/201412/07/2014
Internet address

Keywords

  • Radiant cooling
  • Personalized ventilation
  • Contaminant distribution
  • Personal exposure

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