| Title |
A Study on Ventilation Rate Analysis of Natural Ventilation System by Numerical Analysis |
| Authors |
Choi Tae-Hwoan ; Kim Tae-Yeon ; Leigh Seung-Bok |
| Keywords |
Natural Ventilation System ; Airflow ; CFD |
| Abstract |
The importance of well insulated and air tight building is increasing by the recent issue of energy conserving for buildings. However, air tightness of residential buildings causes the problem of decreasing ventilation rates and it is threatening occupants’ health with low indoor air quality. Not only that but also, many problems of mechanical ventilation system, as the alternative for the problem, are reported from recent studies. Thus, natural ventilation system is considered as one of the most efficient approach for the IAQ problem. Within this context, the necessity of verifying the ventilation performance of natural ventilation system is increasing. To confirm, first of all, the reliability of airflow quantity analysis of natural ventilation system by CFD simulation, depressurization test was carried out in a test cell for a natural ventilation system using a blower door and CFD simulation was also carried out under the same condition. The wind pressure coefficients of the analytical building and the discharge coefficient of the natural ventilation system were found by CFD simulation for network airflow analysis. For the analysis of the annual ventilation performance of the natural ventilation system, a network airflow simulation (TRNFLOW) was used. As the results, the natural ventilation system can provide more than 0.7ACH of annual average ventilation rate with appropriate installation area ratio and of appropriate installation area the system. |