6-12 July
Formal presentation 2 – 10 July
We further developed previous nozzle designs, such as a dome-shaped prototype with holes spread throughout its body. The surface area of the holes combined is approximately equal to the surface area of the original nozzle hole. Tests for efficiency were done in the next week.
To achieve better sealing, 4 corner clamps were designed and incorporated into our prototype. The clamp was modelled with a triangular shape in mind to ensure rigidity. A screw and a pyramidal base was attached to the clamp. However, we did not expect that the 4 corner clamps would cause the acrylic to bend in a convex manner and leave greater gaps at the side. To mitigate the convex bending and side gaps, additional clamps were installed at the midpoints of each edge to distribute pressure more evenly. In the picture below, the green corner clamp was the original clamp. The red clamp was designed to solve the bending issue, while the black one was designed as an alternative but eventually not incorporated into our prototype.
Electrical components were assembled, including an LCD screen that displays concentration of PM and VOC. The LCD screens would eventually be mounted on our prototype to allow the user to view the values for PM and VOC concentration. VOC sensors were exposed to atmospheric air and left to calibrate for over 48hrs.
ANSYS simulation was carried out to replicate air flow into our suction filter when placed in an average room. First, the suction filter was modelled as a hollow cylinder with arbitrary dimensions. Air with a velocity of 1 m/s flowed through the inlet at one end of the cylinder. The outlet at the other end was set at 0 Pa. Next, a 5m x 5m planar surface was created and then extruded to a height of 3m to simulate a room surrounding the suction filter.
