Outlet of the Fan for Overcoming the Suction Limit of Fan Law

Author(s): Chul Hwan Seul

Ventilation systems are crucial for controlling the indoor air quality in closed spaces and mitigating health hazards. However, for a high suction performance, fan-based ventilation requires considerable energy consumption along with subsequent environmental and financial drawbacks. According to the Dalla Valle physical theory, which is a universal physical law applied to fans, it is impossible to achieve air suction beyond the fan's inherent output capacity or to change the suction pattern. However, this research introduces a method to overcome the Dalla Valle physical equation through suction beyond the fan's inherent output capacity and changes in the fan's suction pattern. Our method combines the use of a bladeless fan in series with an axial fan to exploit airflow dynamic properties and increase the output efficiency. Our findings show that the proposed fan configuration provides a new foundation for developing improved ventilation systems to overcome the limitations of fan laws.