THREE DIMENSIONAL SIMULATION OF WIND DRIVEN VENTILATION THROUGH A WINDCATCHER WITH DIFFERENT INLET DESIGNS
- ASME International
- Publication Type:
- Journal Article
- Journal of Thermal Science and Engineering Applications, pp. 1 - 34
Windcatcher is an effective natural ventilation system, its performance depends on several factors including wind speed and wind direction. It provides a comfortable and a healthy indoor environment since the introduced fresh air decreases the moisture content and reduces the pollutant concentration. Since the wind speed and its direction are generally unpredictable, it is important to use special inlet forms and exits to increase the efficiency of a windcatcher. In this study CFD (computational fluid dynamics) modelling is implemented using Ansys Fluent to investigate the airflow entering a three dimensional room through a windcatcher with different inlet designs. Three designs are studied which are a uniform inlet, a divergent inlet and a bulging convergent inlet. The air flow pattern with all inlets provided adequate ventilation through the room. With all the applied wind velocities (1, 2, 3 and 6 m/s) at the domain's inlet the divergent inlet shape has captured the highest air flow through the room and provided higher average velocity at 1.2 m high enhancing the thermal comfort where most of the human occupancy occurs. With 6 m/s wind velocity the divergent inlet has captured 2.55% more flow rate compared to the uniform inlet and 4.70% compared to the bulging convergent inlet, it has also provided an average velocity at 1.2 m high in the room of 7.16% higher than the uniform inlet and 8.44% higher than the bulging convergent inlet.