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When predicting the performance of night ventilation with Building Energy Simulation models, the results are highly sensitive to the selection of the convective heat transfer coefficient (CHTC). Therefore, a numerical study was conducted, simulating rooms with Fluent 12 for 8h of flow time. The study was limited to 2D and results must be considered as qualitative. 14 initial conditions were applied...
The energy performance of night cooling depends largely on the convective heat exchange between thermal mass and room air. This is assessed with BES models, although they have an inaccurate treatment of surface convection by using surface-averaged values for the convective heat transfer coefficient, assuming perfectly mixed air as well as simplified dynamical behavior. Therefore, a clear insight in...
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