To evaluate the performance of different turbulence models in room airflow applications measurements in a test room will be compared to numerical calculations. The measurements are taken in a 6 x 4 x 3 m3 room with two heated dummies and a computer. Zero heat flux boundary conditions are achieved by controlling the inner and outer wall temperature. Two different ventilation systems will be examined in order to get momentum and buoyancy driven flow fields. Temperature measurement and Particle Streak Tracking data will be compared to the numerical predictions.
In the unsteady calculations of room thermal environments, two simple and effective methods were introduced to reduce computer efforts through two case studies. One method (method-A) was applied to a passive solar room analysis (caseA) and another method( method-B) was applied to estimation of energy consumption in an air-conditioned room (caseB). In method-A, flow fields are calculated intermittently, namely, calculated every Nta time step while temperature fields are calculated every time step here, Nta≥ 1.
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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