Efficiency of a heated air curtain under cross-jet temperature gradients

C. Alanis Ruiz; T. van Hooff; B. Blocken; G.J.F. van Heijst

doi:10.26868/25222708.2021.30770

Efficiency of a heated air curtain under cross-jet temperature gradients

C. Alanis Ruiz
, T. van Hooff
, B. Blocken
, G.J.F. van Heijst

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

Abstract

The infiltration of unconditioned outdoor air to controlled indoor environments can have negative impacts on the energy performance and indoor environmental quality of buildings. Air curtains can be used to reduce infiltration through entrance doors where transit is frequent. The stability and performance of air curtains strongly depends on the combination of jet and environmental forces that act on them, including forces due to cross-jet density gradients and injection of buoyancy in the jet. This study addresses the performance of a heated air-curtain system by means of validated computational fluid dynamics (CFD) simulations. Two performance indicators are considered: (1) separation efficiency (related to mass transport), and (2) thermal efficiency (related to heat transport). The results indicate that based on the performance indicators, the use of a heated air curtain is not favorable over the use of an isothermal air curtain.

Original language	English
Title of host publication	BS 2021 - Proceedings of Building Simulation 2021
Subtitle of host publication	17th Conference of IBPSA
Editors	Dirk Saelens, Jelle Laverge, Wim Boydens, Lieve Helsen
Place of Publication	Bruges, Belgium
Publisher	International Building Performance Simulation Association (IBPSA)
Pages	511-517
Number of pages	7
ISBN (Electronic)	9781775052029
DOIs	https://doi.org/10.26868/25222708.2021.30770
Publication status	Published - 2022
Event	Building Simulation 2021 Conference - Bruges (Belgium), Bruges, Belgium Duration: 1 Sept 2021 → 3 Sept 2021 https://bs2021.org/

Publication series

Name	Building Simulation Conference Proceedings
ISSN (Print)	2522-2708

Conference

Conference	Building Simulation 2021 Conference
Abbreviated title	BS 2021
Country/Territory	Belgium
City	Bruges
Period	1/09/21 → 3/09/21
Internet address	https://bs2021.org/

Keywords

air curtain performance
separation efficiency
thermal efficiency
infiltration
computational fluid dynamics (CFD)

Access to Document

10.26868/25222708.2021.30770

Cite this

Alanis Ruiz, C., van Hooff, T., Blocken, B., & van Heijst, G. J. F. (2022). Efficiency of a heated air curtain under cross-jet temperature gradients. In D. Saelens, J. Laverge, W. Boydens, & L. Helsen (Eds.), BS 2021 - Proceedings of Building Simulation 2021: 17th Conference of IBPSA (pp. 511-517). Article 30770 (Building Simulation Conference Proceedings). International Building Performance Simulation Association (IBPSA). https://doi.org/10.26868/25222708.2021.30770

Alanis Ruiz, C. ; van Hooff, T. ; Blocken, B. et al. / Efficiency of a heated air curtain under cross-jet temperature gradients. BS 2021 - Proceedings of Building Simulation 2021: 17th Conference of IBPSA. editor / Dirk Saelens ; Jelle Laverge ; Wim Boydens ; Lieve Helsen. Bruges, Belgium : International Building Performance Simulation Association (IBPSA), 2022. pp. 511-517 (Building Simulation Conference Proceedings).

@inproceedings{ef59cf11699440e78b53f70a2500ac56,

title = "Efficiency of a heated air curtain under cross-jet temperature gradients",

abstract = "The infiltration of unconditioned outdoor air to controlled indoor environments can have negative impacts on the energy performance and indoor environmental quality of buildings. Air curtains can be used to reduce infiltration through entrance doors where transit is frequent. The stability and performance of air curtains strongly depends on the combination of jet and environmental forces that act on them, including forces due to cross-jet density gradients and injection of buoyancy in the jet. This study addresses the performance of a heated air-curtain system by means of validated computational fluid dynamics (CFD) simulations. Two performance indicators are considered: (1) separation efficiency (related to mass transport), and (2) thermal efficiency (related to heat transport). The results indicate that based on the performance indicators, the use of a heated air curtain is not favorable over the use of an isothermal air curtain.",

keywords = "air curtain performance, separation efficiency, thermal efficiency, infiltration, computational fluid dynamics (CFD)",

author = "\{Alanis Ruiz\}, C. and \{van Hooff\}, T. and B. Blocken and \{van Heijst\}, G.J.F.",

year = "2022",

doi = "10.26868/25222708.2021.30770",

language = "English",

series = "Building Simulation Conference Proceedings",

publisher = "International Building Performance Simulation Association (IBPSA)",

pages = "511--517",

editor = "Dirk Saelens and Jelle Laverge and Wim Boydens and Lieve Helsen",

booktitle = "BS 2021 - Proceedings of Building Simulation 2021",

note = "Building Simulation 2021 Conference, BS 2021 ; Conference date: 01-09-2021 Through 03-09-2021",

url = "https://bs2021.org/",

}

Alanis Ruiz, C , van Hooff, T, Blocken, B & van Heijst, GJF 2022, Efficiency of a heated air curtain under cross-jet temperature gradients. in D Saelens, J Laverge, W Boydens & L Helsen (eds), BS 2021 - Proceedings of Building Simulation 2021: 17th Conference of IBPSA., 30770, Building Simulation Conference Proceedings, International Building Performance Simulation Association (IBPSA), Bruges, Belgium, pp. 511-517, Building Simulation 2021 Conference, Bruges, Belgium, 1/09/21. https://doi.org/10.26868/25222708.2021.30770

Efficiency of a heated air curtain under cross-jet temperature gradients. / Alanis Ruiz, C.; van Hooff, T.; Blocken, B. et al.
BS 2021 - Proceedings of Building Simulation 2021: 17th Conference of IBPSA. ed. / Dirk Saelens; Jelle Laverge; Wim Boydens; Lieve Helsen. Bruges, Belgium: International Building Performance Simulation Association (IBPSA), 2022. p. 511-517 30770 (Building Simulation Conference Proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic › peer-review

TY - GEN

T1 - Efficiency of a heated air curtain under cross-jet temperature gradients

AU - Alanis Ruiz, C.

AU - van Hooff, T.

AU - Blocken, B.

AU - van Heijst, G.J.F.

PY - 2022

Y1 - 2022

N2 - The infiltration of unconditioned outdoor air to controlled indoor environments can have negative impacts on the energy performance and indoor environmental quality of buildings. Air curtains can be used to reduce infiltration through entrance doors where transit is frequent. The stability and performance of air curtains strongly depends on the combination of jet and environmental forces that act on them, including forces due to cross-jet density gradients and injection of buoyancy in the jet. This study addresses the performance of a heated air-curtain system by means of validated computational fluid dynamics (CFD) simulations. Two performance indicators are considered: (1) separation efficiency (related to mass transport), and (2) thermal efficiency (related to heat transport). The results indicate that based on the performance indicators, the use of a heated air curtain is not favorable over the use of an isothermal air curtain.

AB - The infiltration of unconditioned outdoor air to controlled indoor environments can have negative impacts on the energy performance and indoor environmental quality of buildings. Air curtains can be used to reduce infiltration through entrance doors where transit is frequent. The stability and performance of air curtains strongly depends on the combination of jet and environmental forces that act on them, including forces due to cross-jet density gradients and injection of buoyancy in the jet. This study addresses the performance of a heated air-curtain system by means of validated computational fluid dynamics (CFD) simulations. Two performance indicators are considered: (1) separation efficiency (related to mass transport), and (2) thermal efficiency (related to heat transport). The results indicate that based on the performance indicators, the use of a heated air curtain is not favorable over the use of an isothermal air curtain.

KW - air curtain performance

KW - separation efficiency

KW - thermal efficiency

KW - infiltration

KW - computational fluid dynamics (CFD)

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DO - 10.26868/25222708.2021.30770

M3 - Conference contribution

T3 - Building Simulation Conference Proceedings

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BT - BS 2021 - Proceedings of Building Simulation 2021

A2 - Saelens, Dirk

A2 - Laverge, Jelle

A2 - Boydens, Wim

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PB - International Building Performance Simulation Association (IBPSA)

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T2 - Building Simulation 2021 Conference

Y2 - 1 September 2021 through 3 September 2021

ER -

Alanis Ruiz C , van Hooff T, Blocken B, van Heijst GJF. Efficiency of a heated air curtain under cross-jet temperature gradients. In Saelens D, Laverge J, Boydens W, Helsen L, editors, BS 2021 - Proceedings of Building Simulation 2021: 17th Conference of IBPSA. Bruges, Belgium: International Building Performance Simulation Association (IBPSA). 2022. p. 511-517. 30770. (Building Simulation Conference Proceedings). doi: 10.26868/25222708.2021.30770

Efficiency of a heated air curtain under cross-jet temperature gradients

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