Paper 4: Volume 4 No.1 June 2005 Edition
Thermal and Airflow Modelling of
Mediterranean Buildings:
Application to Thermal Comfort in Summer
L. Gharbi1, N. Ghrab-Morcos1,2 and
J. J. Roux3
1 National School for Engineers of Tunis, BP
37, 1002 Tunis Belvédère, Tunisie
2 CERTES, Université Paris 12, 94010 Créteil, France
3 Thermal Engineering Centre, National Institute of Applied
Sciences, Lyon, France
Abstract
The assessment of building thermal comfort quality in the
Mediterranean context necessitates an accurate knowledge of air
temperature and velocity fields inside the space. Also, these thermal and
airflow aspects must be considered in combination because of their very
strong interdependence. In this particular context, a three-dimensional
calculation model of coupled heat transfer and airflow calculation has
been developed, which enables the evaluation of temperature field and
airflow pattern inside unconditioned buildings under transient conditions,
taking into account external conditions. This approach is based on a
temperature and pressure driven zonal airflow model, coupled with a
thermal model founded on the coupling of reduced-order state models. By
combining this with a thermal comfort model it is possible to evaluate the
thermal quality of buildings by the prediction of a comfort vote. This
paper presents an application of the coupled simulation tool dealing with
the influence of a night natural cross-ventilation strategy upon the
summer thermal comfort of a Tunisian building.
Key words: zonal model, heat transfer, temperature
and velocity fields, airflow pattern, natural ventilation, thermal
comfort.
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