Pressure Distribution inside Stream Tube of Cross-ventilated Detached House and Simple-shaped Rectangular Model

Natural ventilation rates through openings are predicted based on connected value of resistance coefficients and wind pressure coefficients. The former values can be obtained from the chamber method, and the latter values, from the wind tunnel test with a sealed building. In the cross-ventilation phenomena, however, the connected values of resistance coefficients of each opening are larger than real situation. It is also questionable that the wind pressure coefficients of a sealed building can be really applied to real buildings. Therefore, the stream tube through openings will be analyzed as the flow in real situation by CFD analysis to investigate the transported power with a purpose to establish the prediction method of flow rate based on power balance. Two types of model, a simple-shaped rectangular model and a detached house model, were analyzed with three cases of opening size. Flow fields inside and outside of the model are to be compared between two types of model. The cross-sectional area and average pressure inside the stream tube will be calculated. Based on this analysis, transported power and power loss will be shown. Finally, static pressure inside the stream tube and on the floor will be compared