Simonetti, M.; Fracastoro, G.V.; Perino, M.
Bibliographic info:
The 6th International Conference on Indoor Air Quality, Ventilation & Energy Conservation in Buildings IAQVEC 2007, Oct. 28 - 31 2007, Sendai, Japan

Application of night cooling to educational buildings looks very promising in mild climates. Night coolingstrategy performance in a school building to be realised in Italy during 2008 has been studied by meansof a commercial CFD code.Due to the symmetry of the building, first a 2D numerical model consisting of a vertical section throughthe three-storey building has been developed. The CFD model includes the solid zone describing theconcrete structure. A conjugate heat transfer transient simulation has been implemented to evaluatethe natural ventilation flow and the cooling power during a typical mid-season and summer nightcooling cycle .A similar 3D model has been used to obtain a more detailed description of the air distribution in theroom and to test the results of different turbulence modeling approaches: Reynolds Average NavierStokes (RANS) and Large Eddy Simulation (LES).Some critical aspects of turbulence modeling in buoyancy multi-scale model have been detected andare critically analyzed.Results obtained predict cooling energy saving up to 50% and will be compared with experimentalresults obtained from the monitoring of the building, scheduled starting from year 2009.