Paper 3
Simulating Air Flow, with a Zonal
Model, for Natural Convection in a Partitioned Dwelling
Y. Boukhris, L. Gharbi and N. Ghrab-Morcos
National School for Engineers of Tunis, BP 37, 1002
Tunis Belvédère, Tunisie
Abstract
Convective heat and mass transfer through large internal openings play
an important role in the aero-thermal behaviour of buildings. These
phenomena become even more dominant in the case of naturally ventilated
buildings. The three-dimensional zonal model of coupled heat transfer and
air flow calculations ZAER (Zonal AERial model) has been extended to
enable predictions of variations in temperature distributions and airflows
between and within rooms subjected to natural convection. This new model
has been validated by comparison with experimental measurements and with
results from the zonal model of Wurtz and a computational fluid dynamic (CFD)
tool. A sensitivity analysis with respect to physical parameters is also
presented. The results indicate that this simulation model is an effective
tool for predicting airflow and temperature distribution within a
partitioned dwelling in the case of natural convection.
Key words: zonal model, indoor air, natural convection, ZAER,
large internal opening.
References
Allard F, Brau J, Inard C and Pallier JM: (1987) "Thermal
experiments of full-scale dwelling cells in artificial climatic
conditions", Energy and Buildings, 10, pp 49-58.
Allard F and Utusumi Y: (1992) "Airflow through large
openings". Energy and Buildings. 18, pp 133-145.
Buhl F, Erdem E, Nataf JM, Winkelman F and Sowell E: (1993)
"Recent improvements in SPARK: Strong component decomposition,
multivalued objects and graphical interface", Lawrence Berkeley
National Laboratory Report LBL- 33906- August.
Clark JA, Dempster WM and Negrão C: (1995) "The implementation of
a computational fluid dynamics algorithm within the ESP-r system".
Proceedings of the Building Simulation'95, International Building
Performance Simulation Association, Madison, USA.
Feustel HE and Rayner-Hooson A: (1990) "COMIS Fundamentals",
Berkeley, CA, Lawrence Berkeley National Laboratory, LBNL-28560.
Fissore A, Liebecq G and Sebbar Y: (1990) "Airflow patterns within
buildings", IEA Annex 20 report Subtask 2.1: Flows through large
openings. Université de Liège. Institut de Mécanique.
Gharbi L: (2005) "Modélisation des échanges thermo-aérauliques
dans les bâtiments en régime dynamique". PhD Thesis: Ecole
Nationale d'Ingénieurs de Tunis/Institut National des Sciences
Appliquées de Lyon.
Gharbi L, Ghrab-Morcos N and Roux JJ: (2004) "ZAER: A zonal model
for heat transfer and air flow in unconditioned buildings-an experimental
validation", International Journal of Ventilation, 3, (1), pp11-20.
Gharbi L, Ghrab-Morcos N and Roux JJ: (2005) "Thermal and airflow
modelling of Mediterranean buildings: Application to thermal comfort in
summer", International Journal of Ventilation, 4, (1), pp 37-48.
Inard C: (1988) "Contribution à l'étude du couplage thermique
entre un émetteur de chauffage et un local. Etudes expérimentales en
chambre climatique". PhD Thesis: Institut National des Sciences
Appliquées de Lyon.
Inard C, Bouia H and Dalicieux P: (1996) "Prediction of
temperature distribution in buildings with a zonal model", Energy and
Buildings, 24, pp125-32.
Limam K: (1993) "Contribution à l'étude des transferts de
chaleur et de masse dans les cavités partitionnées. Application à la
caractérisation des transferts aérauliques dans les bâtiments à
travers les grandes ouvertures verticales". PhD Thesis: Institut
National des Sciences Appliquées de Lyon.
Mahajan BM and Hill DD: (1986) "Interzonal natural convection for
various aperture configurations", ASME Winter Annual Meeting, Anaheim
(California).
Ren Z: (2002) "Enhanced modeling of indoor air flows,
temperatures, pollutant emission and dispersion by nesting sub-zones
within a multizone model". PhD Thesis: The Queen's University of
Belfast.
Ren Z and Stewart J: (2003) "Simulating air flow and temperature
distribution inside buildings using a modified version of COMIS with sub-zonal
divisions", Energy and Buildings, 35, pp257-271.
Shiralkar G, Gadgil A and Tien CL: (1981) "High Rayleigh number
convection in shallow enclosures with different and temperature",
International Journal of Heat and Mass transfer, 24, pp 1621-1629.
Van der Maas J, Hensen JLM and Roos A: (1994) "Ventilation and
energy flow through large vertical openings in buildings". 15th AIVC
conference, Buxton, Great Britain, pp 290-301.
Voeltzel A, Carrié FR and Guarracino G: (2001) "Thermal and
ventilation modelling of large highly-glazed spaces", Energy and
Buildings, 33, pp121-132.
Walton GN: (1997) "CONTAM'96 User Manual", NISTIR 6055,
National Institute of Standards and Technology, USA.
Wurtz E: (1995) "Modélisation tridimensionnelle des transferts
thermiques et aérauliques dans le bâtiment en environnement orienté
objet". PhD Thesis: Ecole Nationale des Ponts et Chaussées.
Wurtz E, Nataf JM, and Winlelmann F: (1999). "Two- and
three-dimensional natural and mixed convection simulation using modular
zonal models in buildings", International Journal of Heat and Mass
Transfer, 42, pp 923-940.
|
