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CFD study of the different inlet configurations and airflows in a room with IJV
University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.
2022 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

A method of providing ventilation using impinging jets (IJV) utilizes stratification while delivering air at a high velocity. As a result of this attribute and the simplicity of its terminal construction, IJV offers an advantage over the well-known Displacement Ventilation (DV) system. The corner IJV system was used during this investigation to construct the Computational Fluid Dynamics (CFD) simulation protocol. To verify the suitability of the turbulence model used in the CFD simulation, numerical values derived from several turbulence models were compared to full-scale experiment data. The results of this study demonstrate that turbulent models are the most important factors when using CFD for the study of the velocity field generated by IJVs terminals. A parametric study was conducted after the models were created and verified using the CFD software COMSOL to determine which is the most suitable arrangement for occupants' ventilation and draught avoidance in a square room. Calculations using computational methods were conducted to characterize the rooms' performance under different operating conditions and cross-sections of the air supply terminals. Among the findings of the research is that increasing the cross-section of the supply terminal reduces the sensation of local discomfort, but decreases air velocity speeds. Furthermore, placing the supply terminal on the same side of a room block improves occupant satisfaction, whereas placing the supply terminal on opposite sides enhances ventilation efficiency.

Place, publisher, year, edition, pages
2022. , p. 62
Keywords [en]
Ventilation, CFD, Impinging Jet Ventilation
National Category
Energy Systems
Identifiers
URN: urn:nbn:se:hig:diva-39980OAI: oai:DiVA.org:hig-39980DiVA, id: diva2:1698238
Subject / course
Energy systems
Educational program
Energy systems – master’s programme (two years)
Supervisors
Examiners
Available from: 2022-09-26 Created: 2022-09-22 Last updated: 2022-09-26Bibliographically approved

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CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard-cite-them-right
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • sv-SE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • de-DE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf