Convective heat transfer coefficients at windward building facades: CFD simulations and new generalized expressions

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Abstract

The surface-averaged forced Convective Heat Transfer Coefficient (CHTC) distribution across the facades of a building is influenced by the complex interplay between a wide range of parameters including building geometry, position on the building facade, wind speed and wind direction. Existing CHTC expressions, however, consider the impact of these parameters either incompletely or not at all. Earlier studies have shown
that this shortcoming can lead to significant errors in Building Energy Simulations. This paper, therefore, systematically investigates the combined effects of wind speed, building height and width, and wind direction on the surface-averaged forced CHTC for the windward facade of buildings and presents a new generalized CHTC expression as a function of these parameters. This expression is derived from high-resolution CFD
simulations of wind flow and forced convective heat transfer for 70 different building geometries, 8 wind directions and 4 reference wind speed values. The 3D steady Reynolds-averaged Navier-Stokes equations
are solved combining the high-Re number realizable k-ε model and the low-Re number Wolfshtein model. The CFD simulations are based on a validation study with wind-tunnel measurements of surface temperature
for a reduced-scale cubic model. The accuracy of the expression is confirmed by detailed in-sample and outof-sample evaluations.
Original languageEnglish
Title of host publication7th International Symposium on Computational Wind Engineering (CWE 2018), Seoul, South Korea, June 2018
Number of pages4
Publication statusPublished - 2018
Event7th International Symposium on Computational Wind Engineering (CWE2018) - The-K Hotel Seoul, Seoul, Korea, Republic of
Duration: 18 Jun 201822 Jun 2018
Conference number: 7
http://cwe2018.weik.or.kr

Conference

Conference7th International Symposium on Computational Wind Engineering (CWE2018)
Abbreviated titleCWE 2018
Country/TerritoryKorea, Republic of
CitySeoul
Period18/06/1822/06/18
Internet address

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