Double-skin facades (DSF) have been implemented to harness benefits of increased energy efficiency, acoustic isolation, and access to natural ventilation. The continued innovation and implementation of these systems presents a need for revised structural standards that account for the differing airflow inlet and outlet configurations. Recent multi-story double-skin applications in North America are evaluated to document the current airflow and structural design methodologies utilized in practice. Multi-story double-skin configurations are the focus due to their prevalence in the United States, as learned following a review of 30 existing projects of which 21 had multi-story cavity partitioning. Preliminary simulations are performed using a two-dimensional transient simulation model where the variables considered included cavity aspect ratio (height/depth), ventilation geometry and permeability. These simulations revealed a prominent sensitivity to airflow inlet and outlet configurations, leading the research to extensive three-dimensional simulations with varied airflow configurations while holding other variables constant. To evaluate the structural response of multi-story double-skin facades, the effects of various airflow configurations on the pressure coefficient distribution are examined by using computational fluid dynamics to simulate a wind tunnel testing environment with scaled building geometries. The simulation method is first calibrated and reviewed against existing wind tunnel studies. A prototypical geometry is developed and three-dimensional steady-state computational fluid dynamic simulations are run for twelve configurations of airflow inlet and outlet combinations. The interior skin’s coefficient of pressure profile fluctuates considerably depending on the varying inlet and outlet configurations. Computational fluid dynamics with multiphysics software is evaluated to determine its potential effectiveness as a design tool for the determination of coefficients of pressure for double-skin facades. A set of guidelines is provided for 1) the evaluation process of coefficients of pressure for double-skin facades and 2) the design of various multi-story double-skin facades.
|Commitee:||Carlson, Anders, Schiler, Marc, Wong, Hung Leung|
|School:||University of Southern California|
|School Location:||United States -- California|
|Source:||DAI-A 77/11(E), Dissertation Abstracts International|
|Keywords:||Building enclosure, Computational fluid dynamics, Double-skin facade, Multi-story, Pressure coefficients|
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