ZAER: A Zonal Model for Heat Transfer and Air Flow in
Unconditioned Buildings. - An Experimental Validation
L. Gharbi1,
N. Ghrab-Morcos1,2, 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
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Abstract
This paper presents a
three-dimensional zonal model, ZAER, for heat transfer and air flow
calculations. It is based on an intermediate approach between
single-air-node and CFD models. The indoor air volume is divided into
macroscopic homogeneous zones. Heat and mass balance equations are written
for each zone, while the mass flow rates across the interfaces are
calculated by power pressure laws. The simulation tool ZAER allows the
determination of temperature fields and air flow distributions inside
unconditioned buildings, taking into account external boundary conditions.
We also present an experimental validation of the model by comparing its
predictions with experimental data obtained from measurements on the
experimental cell Minibat (CETHIL, INSA Lyon Laboratory), for different
configurations. The results obtained are in good agreement with
experimental data, and suggest that the ZAER model is an appropriate tool
to assess satisfactorily temperature heterogeneity and air movement within
a room.
Key words: zonal model,
temperature fields, air flow pattern, discharge coefficients, ZAER.
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