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

Abstract

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.