Transient Simulation of Ventilation Rate and Moisture load for Cold Attic Constructions - A CFD Analysis

Examensarbete för masterexamen

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Type: Examensarbete för masterexamen
Master Thesis
Title: Transient Simulation of Ventilation Rate and Moisture load for Cold Attic Constructions - A CFD Analysis
Authors: Hellsvik, Ragnar
Abstract: In this Master's thesis, numerical modeling of transient air, heat and mass transport is investigated in a principal cold attic construction through the use of the commercial CFD software ANSYS Fluent. A numerical model that was developed and validated for steady state simulations in an earlier project is now being used for transient simulations over a total time of 24 hours to capture the daily variations in temperature and humidity levels. The attic model contain wooden joists lying in a layer of insulation at the bottom of the attic, and a triangular shaped air cavity. Natural convection due to the temperature gradients between the hot floor and the cold roof along with forced convection driven by the ventilation system is investigated. An hygrothermal analysis and numerical methods are applied to estimate the moisture load at the inner roof boundary for different ventilation rates. The project has been performed as a collaboration between ÅF Industry AB and the Division of Building Technology at Chalmers University of Technology.
Keywords: Building Futures;Husbyggnad;Building Futures;Building Technologies
Issue Date: 2015
Publisher: Chalmers tekniska högskola / Institutionen för bygg- och miljöteknik
Chalmers University of Technology / Department of Civil and Environmental Engineering
Series/Report no.: Examensarbete - Institutionen för bygg- och miljöteknik, Chalmers tekniska högskola : 2015:57
Collection:Examensarbeten för masterexamen // Master Theses

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