CFD modelling of naturally ventilated double-skin facades with venetian blinds

Ji, Y; Cook, M; Hanby, V; Infield, D; Loveday, D; Mei, L

Abstract

This study describes computational fluid dynamics (CFD) modelling of naturally ventilated double-skin facades
(DSFs) with Venetian blinds inside the facade cavity. The 2D modelling work investigates the coupled convective,
conductive and radiative heat transfer through the DSF system. The angles of the Venetian blind can be adjusted
and a series of angles (08, 308, 458, 608 and 808) have been modelled. The modelling results are compared with the
measurements from a section of a prototype-facade testing facility and with predictions from a component-based nodal model. Agreement between the three methods is generally good. It is thought that discrepancies in the results
are caused by the simplification of the CFD model resulting in less turbulence mixing within the facade cavity. The
CFD simulation output suggests that the presence of the Venetian blinds is able to enhance the natural ventilation
flow within the facade cavity and significantly reduce the heat gains to the internal environment. It was also found
that the convective heat transfer coefficients on the glazing surfaces are insensitive to the blind angles. The work demonstrated the capability of CFD for modelling complicated heat transfer processes through the DSF system and offered some guidance for CFD practitioners who wish to model similar type of flow.

Citation

Ji, Y., Cook, M., Hanby, V., Infield, D., Loveday, D., & Mei, L. (2008). CFD modelling of naturally ventilated double-skin facades with venetian blinds. Journal of Building Performance Simulation, 1(3), 185-196. https://doi.org/10.1080/19401490802478303

• Journal Article Type: Article
• Publication Date: Jan 1, 2008
• Deposit Date: May 27, 2011
• Journal: Journal of Building Performance Simulation
• Print ISSN: 1940-1493
• Publisher: Routledge
• Peer Reviewed: Peer Reviewed
• Volume: 1
• Issue: 3
• Pages: 185-196
• DOI: https://doi.org/10.1080/19401490802478303
• Keywords: double-skin facade, CFD, natural convection, solar radiation, heat transfer
• Publisher URL: http://dx.doi.org/10.1080/19401490802478303