4. Discussion

4.      Discussion

Factors affecting condensation:

Condensation will form on any object when the temperature of the object is at or below the dew point temperature of the air surrounding the object

Singapore Relative Humidity: 80% …….. 24°C

Temperature  / °C
Humidity / %
Relative Dew Point / °C
27
75
22
27
45
13
16
75
11
16
45
4
2
75
-2
2
45
-9

Definition Of Dew Point Temperature
Dew point temperature is defined simply as the temperature at which water vapor, when cooled, will begin to condense to the liquid phase

BUT
The range of a minimum temperature of Singapore is  of 23 °C and a maximum of 32 °C.


Elements of our tower that might contributed to failure:
1) Nylon mesh too big
2) Setup too small
3) Design not ergonomically fit for water to drip.
4) Structure might be too hot > 24°C

What need to be done to ensure success:
1)Maintaining the tower’s temperature at 24°C
2) A bigger sized tower
3) Need a controlled environment that does not have fluctuated temperature and we can easily monitor the tower.



















4.1    Key findings

As you can see from both graphs, there is no water collected in any of the experiment testings and this is not due to the time it was collected from the forest. Thus we can safely eliminate that this was the cause of the failure to collecting water.




4.2    Explanation of key findings
We think that the material is the main contribution to this failure as the nylon might have already absorbed all the water that condensed on this tower. Thus there would not be any water collected in the bowl below. Next, the nylon is porous making it heat up until it is the same temperature as the environment. This means that no water will condense as there is now no cold platform to condense on.

Thus, we decided to seal up the polypropylene bag as the second trial. This would mean that cool air inside the bag will be kept cool for a longer period of time (12 hours at least). As condensation can take place anytime when the bag is cool and since the polypropylene bag  is waterproof, the water droplets will drip into the bowl below.











4.3    Evaluation of engineering goals

We are able to construct a tower that is meant to harvest water with minimal materials such as rattan and tape without using equipment such as saws. Nothing was wasted as we reused the tape and rope when we remake the tower so that it is more stable. Also, no water or any other things are needed.  The current tower is about 105cm by 300cm, which is a small area, thus there would not be any problem with us transporting it around. The method used to build this is very simple too and it will take one or two person to set it up in a few hours. And last but not least, it can collect water that is safe for consumption.















4.4    Areas for improvement

1) Maintaining the tower’s temperature at 24°C as condensation cannot take place when  the temperature is over 24°C.
2) A bigger sized tower to be able to collect more water.
3) Need a controlled environment that does not have fluctuating temperature or else it might affect some of the results.
4) We can make the prototype more stable so that it can withstand the rain.
5) We can also use better materials to get better results. (e.g. rattan with better quality.)
6) A better way of presenting the data we collected so far such that it is very clear to the readers like by using a data logger.
7) A better and simple way to describe the methods to readers.
8)Stronger and more flexible materials

9)Better way to connect the rattans.

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