Localized Ventilation Method for Providing Clean Air to Hospitalized Patients

Lei Shu, Mariya P. Bivolarova*, Arsen K. Melikov

*Corresponding author for this work

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Three novel air terminal devices (ATDs) for localized ventilation were designed (ATD with perforated inner plate, ATD with honeycomb diffuser, and ATD with lobbed nozzle). The ability of the ATDs to provide clean air to the breathing zone of a person lying in a hospital bed was studied. Experiments were performed in a simulated full-scale hospital patient room. A thermal manikin was used to simulate a patient. The ATD was located above the head of manikin. Heated dummy simulated a doctor standing beside the bed. Tracer gas was used to simulate contaminated air exhaled by the doctor. The supply and the exhaust flow rates were controlled at 15.3 L/s and 14.8 L/s, respectively. The supply air temperature and room temperature were kept at 23 °C and 25.3 °C, respectively. Increase of the supply air speed resulted in a cleaner air supply to the breathing zone but also increased the risk of draught. The ATD with a lobbed jet nozzle was able to reduce contaminants by more than half in the breathing zone and to provide the lowest draught risk at the face. This ATD is a better solution to supply clean air in practice comparing to the other two ATDs.

Original languageEnglish
Article number02003
JournalE3S Web of Conferences
Number of pages6
Publication statusPublished - 2021
EventCold Climate HVAC & Energy 2021 - Virtual event, Tallinn , Estonia
Duration: 20 Apr 202121 Apr 2021


ConferenceCold Climate HVAC & Energy 2021
LocationVirtual event
Internet address


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