2. Method And Experimental Design

2.1    Equipment
Cost ($)
5 x 2m
Nylon Mesh
1 x 2m
Cables ties
5 x 2m
Duct Tape
2 Rolls
0 (Brought From Home)

2.3    Procedures
  1. Curl the 1st Rattan into position, which is a circle shape.
  2. Repeat this for at least 3 times with the last rattan being the smallest.
  3. Take a long strip of rattan and curl it side ways such that it intersects with all three circle.
  4. Tie the junction up with the cable
  5. Repeat step 3 and 4 until the tower is secure. (It can stand now)
  6. Using another long strip of rattan, curl it in the opposite direction and repeat step 4 and 5 to form an ‘ X ‘  at the junction
  7. Make 3 separate loop with the metal wire
  8. Spread the mesh over the 3 different loop.
  9. Go through the holes of the mesh alternatively to secure the mesh
  10. Attach the mesh with the other structure by hooking them in place
  11. Leave the set up for about 12hrs. ( Place )

2.4    Risk Assessment and Management
  1. We might cut ourselves as the Rattan’s end is sharp. We should smoothen the end before we use them or tape them up.
  2. We might poke ourselves with the metal wire for the frame and thus we should bend the tip of the wire such that it is blunt.
  3. We need to be careful with the mesh as our fingers might get stuck and panicking might bruise our fingers. We should remain calm and seek for help when we get entangled with the mesh.
  4. We might get hit by the rattan springing back and thus we should always maintain a firm grip on the rattan.

2.5    Data Analysis

Day 1: We did not collect any water probably because the water was evaporating faster than the rate of condensation.

Day 2: After adding a sheet of aluminium at the top of the tower to prevent the evaporated water from escaping, we collected 10 ml of water. We suspec ted the water that was collected was rainwater as it had rained overnight .

Day 3: This time, removed the aluminium sheet on but making a narrow opening in the mesh. We managed to collect 20ml of water but we deduced that it was rainwater as it had also rained overnight.
Day 4: We combine the aluminium sheet and the mesh together. We left it overnight again and found out that there was no water in it the next day. Thus we came to the conclusion that the water that was collected during the previous days was all rainwater.

Nylon Mesh

Polypropylene Bag
1. Ensures the air circulation within the model.

2. More flexible to ensure that the water condensed will flow down at a higher rate.

1. Traps cool air inside the bag

2. Air is poor conductor of heat thus the tower would be cooler for a longer period of time.

1. Absorbs some water

2. Heats up too easily

3.  Easily damaged
1. Hard to maintain

2. Hard to stick it together

Overall Effectiveness

 Experimental Design:

Our project was based on this tower: where,

So we came up with different ways to enhance the condensation process and ended up with this:


But adding a fan is impossible thus we created one without a fan:

When we tested it in the forest :

But this design was proven ineffective in collecting water as the rate of condensation is slower than the rate of evaporation. Thus we ended up with another design which we added a aluminium sheet above to allow evaporated water to condense again.

After we discovered that the structure still did not work, we replaced the nylon mesh with a polypropylene bag we got from IKEA.

No comments:

Post a Comment