Experimental analysis on wall jet night ventilation system

Wenhui Ji, Per Kvols Heiselberg, Qing Luo, Houhua Wang, Zili Zhang

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

Abstract

This paper presents an experimental analysis on night ventilation with wall-attached jet system. In this night ventilation scheme, wall jet is generated by the induced cool outdoor air flowing downward over the inner surface of concrete wall. Full-scale experiments have been performed to study the cooling effect of night ventilation system in Chongqing, China. The velocity gradient of the air curtain in the near wall region is measured. Obvious decline of inner wall surface temperature and room air temperature is observed at the moment when ventilation starts. The wall surface cooling efficiency index and room air distribution efficiency index are defined and calculated. The experimental results reveal that high momentum of wall jet contributes to the cooling effect of walls and room air.
Original languageEnglish
Title of host publicationPROCEEDINGS — Roomvent & Ventilation 2018 : Excellent Indoor Climate and High Performing Ventilation
EditorsRisto Kosonen, Mervi Ahola, Jarkko Narvanne
Place of PublicationHelsinki
PublisherSIY Indoor Air Information Oy
Publication date2018
Pages433-438
ISBN (Electronic)978-952-5236-48-4
Publication statusPublished - 2018
EventRoomvent 2018: International Conference on Air Distribution in Rooms - Aalto University, ,Finland, Espoo, Finland
Duration: 2 Jun 20185 Jun 2018
https://roomventilation2018.org/

Conference

ConferenceRoomvent 2018
LocationAalto University, ,Finland
CountryFinland
CityEspoo
Period02/06/201805/06/2018
Internet address

Fingerprint

Ventilation
Air
Cooling
Air curtains
Momentum
Concretes
Temperature
Experiments

Bibliographical note

Track 3 – Energy and Ventilation: Energy Performance of Buildings (EPB1)

Keywords

  • Night ventilation
  • Air jet
  • Cooling efficiency

Cite this

Ji, W., Heiselberg, P. K., Luo, Q., Wang, H., & Zhang, Z. (2018). Experimental analysis on wall jet night ventilation system. In R. Kosonen, M. Ahola, & J. Narvanne (Eds.), PROCEEDINGS — Roomvent & Ventilation 2018: Excellent Indoor Climate and High Performing Ventilation (pp. 433-438). Helsinki: SIY Indoor Air Information Oy.
Ji, Wenhui ; Heiselberg, Per Kvols ; Luo, Qing ; Wang, Houhua ; Zhang, Zili. / Experimental analysis on wall jet night ventilation system. PROCEEDINGS — Roomvent & Ventilation 2018: Excellent Indoor Climate and High Performing Ventilation. editor / Risto Kosonen ; Mervi Ahola ; Jarkko Narvanne. Helsinki : SIY Indoor Air Information Oy, 2018. pp. 433-438
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title = "Experimental analysis on wall jet night ventilation system",
abstract = "This paper presents an experimental analysis on night ventilation with wall-attached jet system. In this night ventilation scheme, wall jet is generated by the induced cool outdoor air flowing downward over the inner surface of concrete wall. Full-scale experiments have been performed to study the cooling effect of night ventilation system in Chongqing, China. The velocity gradient of the air curtain in the near wall region is measured. Obvious decline of inner wall surface temperature and room air temperature is observed at the moment when ventilation starts. The wall surface cooling efficiency index and room air distribution efficiency index are defined and calculated. The experimental results reveal that high momentum of wall jet contributes to the cooling effect of walls and room air.",
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Ji, W, Heiselberg, PK, Luo, Q, Wang, H & Zhang, Z 2018, Experimental analysis on wall jet night ventilation system. in R Kosonen, M Ahola & J Narvanne (eds), PROCEEDINGS — Roomvent & Ventilation 2018: Excellent Indoor Climate and High Performing Ventilation. SIY Indoor Air Information Oy, Helsinki, pp. 433-438, Roomvent 2018, Espoo, Finland, 02/06/2018.

Experimental analysis on wall jet night ventilation system. / Ji, Wenhui; Heiselberg, Per Kvols; Luo, Qing; Wang, Houhua; Zhang, Zili.

PROCEEDINGS — Roomvent & Ventilation 2018: Excellent Indoor Climate and High Performing Ventilation. ed. / Risto Kosonen; Mervi Ahola; Jarkko Narvanne. Helsinki : SIY Indoor Air Information Oy, 2018. p. 433-438.

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

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AU - Heiselberg, Per Kvols

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N1 - Track 3 – Energy and Ventilation: Energy Performance of Buildings (EPB1)

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AB - This paper presents an experimental analysis on night ventilation with wall-attached jet system. In this night ventilation scheme, wall jet is generated by the induced cool outdoor air flowing downward over the inner surface of concrete wall. Full-scale experiments have been performed to study the cooling effect of night ventilation system in Chongqing, China. The velocity gradient of the air curtain in the near wall region is measured. Obvious decline of inner wall surface temperature and room air temperature is observed at the moment when ventilation starts. The wall surface cooling efficiency index and room air distribution efficiency index are defined and calculated. The experimental results reveal that high momentum of wall jet contributes to the cooling effect of walls and room air.

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KW - Air jet

KW - Cooling efficiency

KW - Night ventilation

KW - Air jet

KW - Cooling efficiency

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EP - 438

BT - PROCEEDINGS — Roomvent & Ventilation 2018

A2 - Kosonen, Risto

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PB - SIY Indoor Air Information Oy

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Ji W, Heiselberg PK, Luo Q, Wang H, Zhang Z. Experimental analysis on wall jet night ventilation system. In Kosonen R, Ahola M, Narvanne J, editors, PROCEEDINGS — Roomvent & Ventilation 2018: Excellent Indoor Climate and High Performing Ventilation. Helsinki: SIY Indoor Air Information Oy. 2018. p. 433-438