Experimental Study of the Cross-infection Risk due to the Cross-flow of Exhaled Airflows and a Plane Jet with the Protected Occupied Zone Ventilation

Guangyu Cao, Peter Vilhelm Nielsen, Chunwen Xu, Rasmus Lund Jensen

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

Abstract

The objective of this study is to determine how the cross infection risk can be minimized between two persons with a plane jet of the protected occupied zone ventilation (POV) system. The exhaled air of infected people can be one of the sources of infectious respiratory viruses and bacteria. The infectious exhaled air may from the respiratory activities such as the breathing, coughing, sneezing, and talking. A plane jet was formed in the POV system to separate the room into a source zone and a target zone in a climate chamber, in which tow breathing thermal manikins are employed to produce breathing airflows. The exhaled air velocity and the downward jet velocity were measured at a frequency of 10 Hz, by which the maximum velocity of exhaled airflow can be obtained. In this study, the promising results show that the downward plane jet of POV system can break the exhalation airflow from the source manikin when the supply air velocity in the plane jet is above a certain level. With the downward plane jet, the personal exposure risk from the exhalation airflow is significantly reduced. The supply air velocity of the plane jet plays a critical role in reducing the personal exposure. A supply air velocity higher than 3.0 m/s (9.8 fps) is able to break the exhaled airflow.
Original languageEnglish
Title of host publicationASHRAE 2014 Annual Conference
Number of pages8
PublisherAmerican Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.
Publication date2014
Publication statusPublished - 2014
EventASHRAE 2014 Annual Conference: 2nd Annual Research Summit - Seattle, WA, United States
Duration: 28 Jun 20142 Jul 2015
Conference number: 2

Conference

ConferenceASHRAE 2014 Annual Conference
Number2
CountryUnited States
CitySeattle, WA
Period28/06/201402/07/2015

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Cao, G., Nielsen, P. V., Xu, C., & Jensen, R. L. (2014). Experimental Study of the Cross-infection Risk due to the Cross-flow of Exhaled Airflows and a Plane Jet with the Protected Occupied Zone Ventilation. In ASHRAE 2014 Annual Conference American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc..