After a literature review about zonal models, we have developed a simplified approach to simulate buoyancy-driven flow in rooms. With two different simple models we have computed the Annex-20 test case d using the procedure prescribed by Lemaire (Annex 20 report, R.I. 1.15). The two simplified methods employ a two-zone and five-zone model. The simulation results of test case d are submitted for comparison with experimental data of heat fluxes and air temperature profiles. The two-zone and five-zone models are also compared with each other.
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