| Title |
A Study on the Application Evaluation of Double Damper to Prevent Headwinds in Building Direct Exhaust System |
| Authors |
천창현(Chyeon, Chang-Hyun) ; 손유라(Son, Yu-Ra) ; 금하영(Kum, Ha-Yeong) ; 양정훈(Yang, Jeong-Hoon) |
| DOI |
https://doi.org/10.5659/JAIK.2021.37.10.165 |
| Keywords |
Direct Exhaust System; Headwind; Vent Cap; Double Damper; CFD; Exhaust Airflow Rate |
| Abstract |
The air supply and exhaust ports of the direct exhaust system installed outside the building are pressurized by external wind pressure, which
results in poor exhaust performance. The purpose of this study is to evaluate the performance of Double Damper developed to improve the
exhaust performance of the direct exhaust system degraded by external wind. When external wind is generated through CFD analysis, the
distribution of air flow velocity and internal static pressure of Double Damper are analyzed. As a result, the exhaust air flow from the
exhaust system was emitted to the second exhaust section of Double Damper. In the case of downwash during external wind, there was no
inflow of external wind through the vent cap because the internal static pressure of the Double Damper represents a negative value. The
external wind was reproduced with headwinds of 0o, 23o, 45o, 68o and 90o based on vent cap. When Double Damper was installed, the
exhaust system had a flow rate growth rate of up to 14.14%. Double Damper was able to improve headwind blocking and exhaust
performance if the headwind was greater than exhaust emission and static pressure. Double Damper confirmed that it is effective when using
a vent cap that is vulnerable to headwind. |