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


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
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


ConferenceRoomvent 2018
LocationAalto University, ,Finland
Internet address

Bibliographical note

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


  • Night ventilation
  • Air jet
  • Cooling efficiency


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