Apply Of CFD Software In HVAC And Analysis Of Natural Ventilation In Tiered-seating Classroom

CFD stands for Computational Fluid Dynamics and is a new subject of Computer Science and Numerical Calculation. Some research in depth was done on commercial CFD software, such as Fluent, Ansys CFX, PHOENICS, Star-CD and so on. Especially in Fluent, this paper summarizes four solutions in HVAC simulation which are Natural Convection, VOC concentration field, VOC absorption by wall, humidity field. After that, natural ventilation in tiered-seating classroom has been come up with first time in this paper, and is simulated by Fluent, and some answers are presented. These researches contribute to HVAC on CFD.Natural ventilation was used by architect in the world, and they made use of this method in the way of construction, which had the advantage without additional investment.Dooryard is one of the ordinary natural ventilation architecture whose characteristic is practical and fit for almost everywhere. Sunshine is used by dooryard and the air's temperature is ascending in building, and force the air ventilates from bottom to top. In the way energy is saved. Four Dooryard building were investigated by author and some suggestions were made.Tiered-seating classroom is a special type of architecture and provides good fields of vision and audition for students at back seats of the classroom, but, whether its natural ventilation is better than, or at least the same as that of ordinary classroom remains unknown. This is the key point we care about, so computational fluid dynamics (CFD) was used to simulate the airflow in one ordinary classroom and two tiered-seating ones. At last, some conclusions and suggestion were made on natural ventilation architecture.