Study of ventilation flow in a room induced by solar chimneys
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A Solar Chimney is a structure for ventilation purpose installed on the roof or side of any building to induce the stagnant air present in the room / building naturally to the outside using solar heat and attracts the fresh air from outside into the building. Many researchers and scientists have carried out studies based on computation and experiments for different type of solar chimney systems. Despite the fact that extensive work has already been carried out in this field but still huge potential exists to make this system more effective and economical. The focus of the study and research is on solar chimney based ventilation systems. The use of Computational Fluid Dynamics (CFD) in solar chimney based system has been investigated and CFD models have been developed for research. In this study, naturally induced flow through a Two and Three Dimensional square rooms having dimensions (3 Meter × 3 Meter) and (3 Meter × 3 Meter × 3 Meter) respectively have been developed and investigated through numerical analysis. The numerical analysis has been carried out using Computational Fluid Dynamics (CFD) software. An inclined solar chimney has been used on the roof of the above mentioned square room to induce air flow through the room. Based on the previous research in this field, the chimney height has been taken as 1.5 meter (effective length 2.12 meter), width of the chimney (0.3 meter for 2D room and 0.4 meter for 3D room). The chimney inclination angle is 45 degree with roof top and solar heat flux rate for chimney heated wall has been fixed as 300 W/m². The room air inlet is square shaped having dimensions 0.4 meter × 0.4 meter. The purpose is to investigate the effect of change of room air inlet position (Bottom, Center, Top of the room side wall) to ultimately design / suggest most effective scenario. The graphical and numerical analysis shows that by changing the room air inlet location, the air flow rate and flow pattern significantly changes. The best pattern is the one where air is evenly distributing in the room and passes through the sitting area of the occupants i.e. around floor of the room. Keeping this important factor in view, the desired air flow pattern, in both 2D and 3D simulations, has been seen in a model with air inlet location at top of the side wall.
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