Temperature and Humidity testing within enclosures using probes and excel
Temperature and Humidity testing within an enclosure
Mar 22, 2016
Temperature and Humidity testing within an enclosure using a humidity and temperature probe, arduino, and excel. Silica and Plastic were found to have the most desirable properties.
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Temperature and Humidity testing within enclosures using probes and excel
Equipment:
✴- Temperature and Humidity Sensor
■- Arduino Demonolive ◉- Scales ➢- Enclosure Simulator
∞- Material Holder
◀- Misting Bottle
Absorbent Materials:
✴- Silica Crystals (kittie litter)
■- Rice (long grain)
◉- Cooking Salt
➢- Bi-Carb Soda
✴
■
◀
◉
∞➢
✴ ■ ◉ ➢
Humidity Testing
Method 1 - 3ml of Mist in Room
1) Attach sensor to inside of container2) Measure 50 grams of Material and place inside container( simulated enclosure).3) Spray 3ml (3 sprays from misting bottle) of hot water into container and quickly close.4) Let container sit in place for 15 minutes. Data is recorded every 20 seconds and collated in laptop.5) Data is analysed and converted into graph form.
Method 2 - Humid Bathroom
1) Make bathroom hot and humid - leave hot water running for 5 minutes at beggining of experi-ment, with heater on for full duration on experiment.2) Attach sensor to inside of container3) Measure 50 grams of Material and place inside container( simulated enclosure).4) Let container sit in place for 15 minutes. Data is recorded every 20 seconds and collated in laptop.5) Data is analysed and converted into graph form.
Humidity Testing
18.45
18.5
18.55
18.6
18.65
18.7
18.75
18.8
18.85
18.9
18.95
40
50
60
70
80
90
100
0 200 400 600 800 1000 1200
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Control - 3ml Mist in Room
16.4
16.6
16.8
17
17.2
17.4
17.6
17.8
18
18.2
18.4
40
50
60
70
80
90
100
0 200 400 600 800 1000 1200 1400 1600
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Control - Humid Bathroom
Humidity Testing
17.5
17.6
17.7
17.8
17.9
18
18.1
18.2
18.3
18.4
40
50
60
70
80
90
100
0 100 200 300 400 500 600 700 800 900 1000
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Bi-Carb - 3ml Mist in Room
18
18.5
19
19.5
20
20.5
21
21.5
40
50
60
70
80
90
100
0 100 200 300 400 500 600 700 800 900
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Bi-Carb - Humid Bathroom
Comments: Bi-Carb Soda showed positive results in the bathroom test. These were not significant overall however.
Humidity Testing
17.95
18
18.05
18.1
18.15
18.2
18.25
18.3
18.35
18.4
18.45
40
50
60
70
80
90
100
0 100 200 300 400 500 600 700 800 900 1000
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Rice - 3ml Mist in Room
21.4
21.6
21.8
22
22.2
22.4
22.6
22.8
23
23.2
23.4
40
50
60
70
80
90
100
0 100 200 300 400 500 600 700 800 900 1000
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Series1 Series2
Rice - Humid Bathroom
Comments: Rice was surprisingly effective. I am not sure if it is the actual rice which is enabling the absorption or the starch which surrounds the rice. Further testing with washed rice and isolated starch needs to be performed to confirm the active absorptive material.
Humidity Testing
17.8
18
18.2
18.4
18.6
18.8
19
19.2
40
50
60
70
80
90
100
0 100 200 300 400 500 600 700 800 900 1000
Tem
pera
ture
°C
Hum
id %
Time in Seconds
Humidity Temperature
Silica - 3ml Mist in Room
24.6
24.7
24.8
24.9
25
25.1
25.2
25.3
25.4
40
50
60
70
80
90
100
0 200 400 600 800 1000 1200
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Silica - Humid Bathroom
Comments: Silica has easily outperformed all other dehumidifying materials. This materi-als can also be reused by simply applying heat and evaporating the absorbed moisture. It is also relatively cheap with 1.75kg costing 7.95 at a local petstore. The absorbance is also increased if you spread the material out rather than having it bunched together.
Humidity Testing
17.5
17.6
17.7
17.8
17.9
18
18.1
18.2
18.3
18.4
40
50
60
70
80
90
0 100 200 300 400 500 600 700 800 900
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Salt - 3ml Mist in Room
23.4
23.6
23.8
24
24.2
24.4
24.6
24.8
25
25.2
40
50
60
70
80
90
100
0 100 200 300 400 500 600 700 800 900 1000
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Salt - Humid Bathroom
Comments: Salt did work as an absorbent, however the rate at which absorption occurred was to low for it be useful to protect electronics. One benefit of using this material would be how easily it is sourced and the cost, both making it highly accessible.
Humidity Testing
Insulating Enclosures:
✴ Metal Ammunition Container ■- Styrofoam Container ◉- Plastic Storage Container ➢- Clear Plastic Bag (air acts as insulator)
0
5
10
15
20
25
30
35
40
50
60
70
80
90
100
0 100 200 300 400 500 600 700
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Probe in Hot Environment
✴ ■
◉
➢
Method
1) Place probe within container and seal shut.2) Place container in front of heater within sealed room.3) Leave in place for 15 minutes, collecting data every 20 seconds 4) Colate and graph data collected with probe
Temperature Testing
22
22.5
23
23.5
24
24.5
25
25.5
26
30
40
50
60
70
80
90
100
0 100 200 300 400 500 600 700
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Plastic Container in Hot Environment
0
5
10
15
20
25
30
40
50
60
70
80
90
100
0 200 400 600 800 1000 1200
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Metal Container in Hot Environment
Temperature Testing
23.5
24
24.5
25
25.5
26
26.5
27
27.5
28
28.5
29
40
50
60
70
80
90
100
0 100 200 300 400 500 600 700 800 900 1000
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Styrofoam in Hot Environment
20
22
24
26
28
30
32
34
40
50
60
70
80
90
100
0 100 200 300 400 500 600 700 800 900 1000
Tem
pera
ture
°C
Hum
idity
%
Time in Seconds
Humidity Temperature
Clear Bag in Hot Environment
Temperature Testing
Results: Temperature Testing
Plastic insulated the most
The clear plastic container gave the best insulating results. This could partly have to do with how the actual container was also sealed, using two side latches and rubber lining. It could also have to do with the form of the object. However it is clear that the material itself also has an effect as the form of the styrofoam and metal container was quite similar however gave varied results The metal container used a similar design with latches and rubber lining, however this did not improve insulation as much. These results were very surprising to me. I hypoth-esised that the metal container would be the best at insulating purely because it was equipment from the army to hold ammunition and therefore should be temperature stable. It was surprising to see how much it heated up compared to the other containers. The plastic bag, which was essentially going to work by having such a large space of air to maintain its temperature also showed bad results for insulation. One way to improve this test would be to have 4 simultaneous probes running in the same environment. This way it would be definite that there are no variances which are leading to differences in the data. This will be improved in future testing using two separate probes.
Results: Humidity Testing
Silica is most absorbent
Silica has clearly come out on top as the most absorbent in the quickest amount of time. It has the highest rate of absorption. The rate of absorption appeared to increase as the silica was spread out, increasing its surface area. Perhaps some sort of padding could be made out of the silica which could line the inside of the enclosure, creating a highly absorptive surface as well protection in terms of insulation and padding for the bot.
I believe the first set of data is not as valid as the second data collected inside a very humid environment, the bathroom. The bathroom had water droplets forming on the walls and tiles so i believe the readings which range in the 90% area are quite accurate. I believe the method of creating humidity with a spray bottle in the first experiment did not properly simulate humidity immediately. Rather it created an environment within the enclosure which was wet and gradually became more humid, giving results where humidity constantly rose. I decided to include both sets of data to show that still in both the experiments silica showed the best results.
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