Building Simulation

, Volume 10, Issue 5, pp 737–754 | Cite as

Numerical assessment of the efficiency of fenestration system and natural ventilation mechanisms in a courtyard house in hot climate

Research Article Indoor/Outdoor Airflow and Air Quality


This paper presents an assessment of the efficiency of the fenestration system in a courtyard house in hot climate. The empirical work draws better understanding of the wind behavior inside and outside the building and the manner of both the wind-driven and stack ventilation through conducting computational fluid dynamics (CFD) modeling. Numerous steady state simulations were applied for different time-steps to cover possible variations of boundary conditions to get aggregated results for airflow during summer in a couple of spaces in the house. The results were analyzed and values of the air change rates were extracted for the summer season. The role of each component involved in the natural ventilation process was identified through determination of the airflow pattern and break-down assessment. Simulations showed the stabilization of wind velocity inside the courtyard which protects the building against undesirable high velocities. The analysis demonstrated the efficiency of the distribution of openings as well as the role of the roof wind-escape in the enhancement of air circulation and the indoor air quality. For two different spaces, the wind escape device is found to increase the air change rates (ACH) as more as 25% and 60% than the 2-side ventilation case in which the ACH was increased as more as 45% and 27% than the single-side. The relationship between cross ventilation and indoor temperature was illustrated through the transient simulations.


natural ventilation airflow CFD simulation indoor temperature 


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The study is a part of a research work financed through a scholarship from the German Academic Exchange Service (DAAD).

Supplementary material

12273_2017_357_MOESM1_ESM.pdf (823 kb)
Numerical assessment of the efficiency of fenestration system and natural ventilation mechanisms in a courtyard house in hot climate


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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Wael A. Yousef Mousa
    • 1
  • Werner Lang
    • 1
  • Thomas Auer
    • 2
  1. 1.Institute of Energy Efficient and Sustainable Design and BuildingTechnische Universität MünchenMünchenGermany
  2. 2.Building Technology and Climate Responsive DesignTechnische Universität MünchenMünchenGermany

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