USING CFD SIMULATIONS TO IMPROVE THEMODELING OFWINDOW DISCHARGE COEFFICIENTS
Erin L. Hult, Gianluca Iaccarino, Martin Fischer
Accurate parameterization of flow through window openings is necessary in order to model passive and mixed-mode ventilation strategies using airflow network models and energy simulation tools. In these tools, lit- tle guidance is typically provided on selecting airflow pa- rameters such as the discharge coefficient for windows. Detailed computationalfluid dynamics (CFD) simulations can provide an inexpensive, flexible method for develop- ing such parameterizations. In this study, the discharge coefficient for pivoted windows is considered, using an- alytical and CFD modeling as well as comparison with previous data. The discharge coefficient parameteriza- tion currently used in EnergyPlus can lead to an under- estimate of flow through pivoted windows by up to fac- tor of 2. This parameterization for the discharge coeffi- cient as a function of window angle and aspect ratio is modified, and Reynolds-averaged numerical simulations are used to validate this new formulation. Analytical and numerical results compare well with measurements from windowmanufacturers.
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