Protected zone ventilation and reduced personal exposure to airborne cross-infection

Guangyu Cao (Corresponding Author), P.V. Nielsen, R.L. Jensen, P. Heiselberg, L. Liu, Jorma Heikkinen

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)

Abstract

The main objective of this study was to examine the performance of protected zone ventilation (PZV) and hybrid protected zone ventilation (HPZV) to reduce the direct exposure to exhaled air from others' breathing. Experimental measurements are carried out to test the performance of PZV in a full-scale office room with two breathing thermal manikins. The measurements were performed under three configurations, including two standing manikins at different distances: 0.35, 0.5, and 1.1 m. When the supply air velocity is increased to 4 m/s in the downward plane jet, the dimensionless concentration is 40% lower than for fully mixed ventilation, which can be considered as a measure of protection from the zoning condition. The measurement results showed that in both the PZV and the HPZV system it is possible to decrease the transmission of tracer gas from one manikin to the opposite manikin; therefore, it probably would reduce the risk of air borne cross-infection between two people at the same relative positions. The results suggest that PZV and HPZV may be used to reduce the exposure of people in a protected zone from indoor pollutants emitted in a source zone.
Original languageEnglish
Pages (from-to)307-319
JournalIndoor Air
Volume25
Issue number3
DOIs
Publication statusPublished - 2015
MoE publication typeA1 Journal article-refereed

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Cross Infection
Ventilation
Manikins
Air
Respiration
Zoning
Hot Temperature
Gases

Keywords

  • protected zone ventilation
  • air velocity
  • cross-infections
  • contaminants
  • plane jet

Cite this

Cao, G., Nielsen, P. V., Jensen, R. L., Heiselberg, P., Liu, L., & Heikkinen, J. (2015). Protected zone ventilation and reduced personal exposure to airborne cross-infection. Indoor Air, 25(3), 307-319. https://doi.org/10.1111/ina.12142
Cao, Guangyu ; Nielsen, P.V. ; Jensen, R.L. ; Heiselberg, P. ; Liu, L. ; Heikkinen, Jorma. / Protected zone ventilation and reduced personal exposure to airborne cross-infection. In: Indoor Air. 2015 ; Vol. 25, No. 3. pp. 307-319.
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Cao, G, Nielsen, PV, Jensen, RL, Heiselberg, P, Liu, L & Heikkinen, J 2015, 'Protected zone ventilation and reduced personal exposure to airborne cross-infection', Indoor Air, vol. 25, no. 3, pp. 307-319. https://doi.org/10.1111/ina.12142

Protected zone ventilation and reduced personal exposure to airborne cross-infection. / Cao, Guangyu (Corresponding Author); Nielsen, P.V.; Jensen, R.L.; Heiselberg, P.; Liu, L.; Heikkinen, Jorma.

In: Indoor Air, Vol. 25, No. 3, 2015, p. 307-319.

Research output: Contribution to journalArticleScientificpeer-review

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T1 - Protected zone ventilation and reduced personal exposure to airborne cross-infection

AU - Cao, Guangyu

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AU - Jensen, R.L.

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AU - Liu, L.

AU - Heikkinen, Jorma

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N2 - The main objective of this study was to examine the performance of protected zone ventilation (PZV) and hybrid protected zone ventilation (HPZV) to reduce the direct exposure to exhaled air from others' breathing. Experimental measurements are carried out to test the performance of PZV in a full-scale office room with two breathing thermal manikins. The measurements were performed under three configurations, including two standing manikins at different distances: 0.35, 0.5, and 1.1 m. When the supply air velocity is increased to 4 m/s in the downward plane jet, the dimensionless concentration is 40% lower than for fully mixed ventilation, which can be considered as a measure of protection from the zoning condition. The measurement results showed that in both the PZV and the HPZV system it is possible to decrease the transmission of tracer gas from one manikin to the opposite manikin; therefore, it probably would reduce the risk of air borne cross-infection between two people at the same relative positions. The results suggest that PZV and HPZV may be used to reduce the exposure of people in a protected zone from indoor pollutants emitted in a source zone.

AB - The main objective of this study was to examine the performance of protected zone ventilation (PZV) and hybrid protected zone ventilation (HPZV) to reduce the direct exposure to exhaled air from others' breathing. Experimental measurements are carried out to test the performance of PZV in a full-scale office room with two breathing thermal manikins. The measurements were performed under three configurations, including two standing manikins at different distances: 0.35, 0.5, and 1.1 m. When the supply air velocity is increased to 4 m/s in the downward plane jet, the dimensionless concentration is 40% lower than for fully mixed ventilation, which can be considered as a measure of protection from the zoning condition. The measurement results showed that in both the PZV and the HPZV system it is possible to decrease the transmission of tracer gas from one manikin to the opposite manikin; therefore, it probably would reduce the risk of air borne cross-infection between two people at the same relative positions. The results suggest that PZV and HPZV may be used to reduce the exposure of people in a protected zone from indoor pollutants emitted in a source zone.

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Cao G, Nielsen PV, Jensen RL, Heiselberg P, Liu L, Heikkinen J. Protected zone ventilation and reduced personal exposure to airborne cross-infection. Indoor Air. 2015;25(3):307-319. https://doi.org/10.1111/ina.12142