Paper Conference

Proceedings of SimBuild Conference 2012: 5th conference of IBPSA USA

     

SIMULATING NATURALLY VENTILATED BUILDINGS WITH DETAILED CFD-BASED WIND PRESSURE DATABASE

Bing Wang, Timur Dogan, Debashree Pal, Christoph Reinhart

Abstract: Natural ventilation has long been recognized as a sustainable design strategy to replace or reduce energy associated with fans or active cooling systems in buildings. When it comes to designing a passive system based concept that involves natural ventilation, a major difficulty for design teams is to reliably predict indoor ventilation rates especially in buildings located in a dense urban context. This manuscript proposes a new concept to model ventilation rates and hourly annual indoor temperature distributions using a combination of outside CFD (Computational Fluid Dynamics) calculations and indoor airflow network calculations. In the first step, CFD calculations for eight cardinal wind directions are used to populate a custom database of pressure coefficients for each window in an urban scene. In the second step, hourly wind data and pressure coefficients method have been implemented in Rhinoceros 1 in combination with Phoenics 2 and EnergyPlus 3. Example results are presented for several typical cases, indicating the improvement of this workflow on simulation results, especially for building with particular shape and urban context.
Pages: 353 - 360
Paper:
simbuild2012_06a_3_Wang