Unsteady nodal modeling of building ventilation networks - CEA - Commissariat à l’énergie atomique et aux énergies alternatives
Article Dans Une Revue Building and Environment Année : 2022

Unsteady nodal modeling of building ventilation networks

Résumé

Ventilation network design and analysis are generally performed using nodal approaches (egg. 1 node for eachzone) and quasi-static assumption. Thus, inertia effects of ducts are neglected as well as any possible acousticresonance that could occur in any internal volume. These effects might be not as negligible as one could thinkwhile studying particular transient boundary conditions. Wind effect, including its turbulence, even at relativelysmall velocity, windstorm impact, flow disturbance, imply internal pressure fluctuations that cannot be caught ifquasi-static assumption is considered within nodal numerical models. Inertia effect is not automatically linked tocompressible and resonance assumptions can be identified even in incompressible conditions.The present study aims to identify in which cases the quasi-static assumption can be made. Simple stepwiseboundary conditions are applied on a simple configuration with one zone and two ducts. The MATHIS software,developed to analyze ventilation systems in buildings and chosen as the standard tool in the French context, isused for this study and validated under unsteady state for a single zone case. A new approach is proposed to builda unique graphical analysis from two groups of terms, being define using a dimensionless method. Its usageenables to highlight in which situation internal pressure resonance will happen and therefore helps the modelerto choose the correct assumptions for further simulations.
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Dates et versions

cea-04250006 , version 1 (19-10-2023)

Identifiants

Citer

Ali Esber, Xavier Faure, Francois Demouge, Etienne Wurtz, Simon Rouchier. Unsteady nodal modeling of building ventilation networks. Building and Environment, 2022, 209, pp.108671. ⟨10.1016/j.buildenv.2021.108671⟩. ⟨cea-04250006⟩
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