Natural ventilation is an important factor in the design of sustainable buildings; it has the potential to improve air quality, while providing thermal comfort at reduced energy costs. Computational fluid dynamics (CFD) simulations provide comprehensive information on the internal flow pattern and can be used as a design tool. The present work offers insight of natural ventilation in a fully functional building, namely, the solar facility Interlock House in Iowa. Ventilation in the house is studied during summer months with some of its furniture included. The results show quantitative agreement between numerical simulations and experiments of vertical temperature profiles for each room. The temperature profile of the room with the inlet opening shows a more pronounced temperature variation. Flow patterns show higher velocities near the walls and marked flow circulation towards the opposite side of the building. The purpose of this work is to validate the numerical model that predicts airflow distribution for different configurations. INTRODUCTIONAlmost 40% of the energy usage in the US is utilized in buildings and about 48% of that usage corresponds to heating and cooling. Natural ventilation is an important factor in the design of sustainable buildings; it has the potential to improve air quality, while providing thermal comfort at reduced energy costs. Although the benefits of natural ventilation make it an attractive alternative, as wind and thermal energy are free resources, a good

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Abstract-Particle pollutant is the prime pollutant of most cities in china, the tiny particle accumulated lots of harmful substance, and it is the carrier of bacteria, revealing the Mechanism of particle transport has an important meaning on controlling the indoor particle pollutant and disease prevention. This article sets up the model of particle penetrating the building envelope based on mathematics modeling, this model takes the pressure difference between indoor and outdoor( air change rate in rooms), crack depth, crack height and particle size as the input parameters and using the CFD to do the simulation analysis , drawing a conclusion.

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