Performance of "ductless" personalized ventilation in conjunction with displacement ventilation: Impact of disturbances due to walking person(s)

Barbara Halvonova, Arsen Krikor Melikov

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The performance of the novel "ductless" personalized ventilation in conjunction with displacement ventilation (DV) was compared with the performance of DV alone under realistic conditions involving disturbances due to walking of one or two persons. An office room with two workstations was arranged in a full-scale test room. Two thermal manikins were used as sedentary occupants at the workstations. Two pollution sources, namely exhaled air by one of the manikins and passive pollution on the table in front of the same manikin were simulated. The performance of the ventilation systems was evaluated with regard to the quality of inhaled air and thermal comfort of the seated "occupants". The walking person(s) caused mixing of the clean and cool air near the floor with the polluted and warmer air at higher levels and disturbed the displacement principle which resulted in a decrease of the inhaled air quality. The performance of the "ductless" PV under the tested conditions was better as opposed to DV alone. Thus in practice the "ductless" PV will be superior to DV alone as regards perceived quality of inhaled air. The location of a walking person was found to be important. Person(s) walking close to the displacement diffuser will cause greater disturbance.
Original languageEnglish
JournalBuilding and Environment
Volume45
Issue number2
Pages (from-to)427-436
ISSN0360-1323
DOIs
Publication statusPublished - 2010

Keywords

  • Thermal comfort
  • Inhaled air quality
  • Movement of occupant
  • "Ductless" personalized ventilation
  • Displacement ventilation

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