Preliminary study of fan-filter unit performance relating to the constituent components

By experiments, studies the influence of AC motor versus brushless DC motor, 2D-blade fan versus 3D-blade fan and different structures on the performance of fan-filter unit (FFU) including aerodynamics, energy consumption and air velocity uniformity. The results show that an FFU equipped with brushless DC motor is more economical than that with AC motor, saving more energy when running at the lower speed conditions. An FFU equipped with 2D-blade fan has different performances from that with 3D-blade fan and they have different scopes of application. Air velocity uniformity of an FFU depends heavily on its structure, and a structure with larger plenum chamber and air outlet area and symmetry arrangement of air outlets contributes to improvement of air velocity uniformity.