1. Elecrivert Joaquin Miller Middle School
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2. What are the differences and similarities between thermoelectric generators and Stirling engines in terms of efficiency and affordability?
Stirling Engines
FEATURES
Stirling Engine is around 50% efficiency
Generator up to 90% efficiency
50% * 90% = best case 45% efficiency
Larger and more costly.. Small ones are $ and are still fairly large.
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3. Thermoelectric Generators
What are the differences and similarities between thermoelectric generators and Stirling engines in terms of efficiency and affordability?
Thermoelectric Generators
FEATURES
TEGs efficiency 5-8%
Generates ~ 0.07 to 0.2W at 60 to 80C
$29
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4. What are the differences and similarities between thermoelectric generators and Stirling engines in terms of efficiency and affordability?
Solar Panels
FEATURES
Solar Panels are typically 15-20% efficient
1W panel about $4 to 6
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5. How should we build this device and how large does it have to be for it to work efficiently to charge up a small device like a cell phone?
Phone Charging
Cell phone charging ranges from about 1W to about 18W currently.
For example an iPhone 8 has an 1821mAh battery and takes about 3 hours to charge at 5W or 15 hours at 1W.
One thermoelectric generator would take about 214 hours with a hot beverage on it to charge an iPhone 8 from 0 to 100%.
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6. Can the materials used to build such a device be easily acquired
Can the materials used to build such a device be easily acquired? Where do we get the materials needed to build this for ourselves?
Materials
All of these things can be purchased.
To convert generated power to phone charging voltage (5V) a buck or boost converter is needed.
Example: for $15
for electronic components
for electronic components and kits
for the thermoelectric generator
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7. What other companies have a product already built and why is this product not well known?
Power Pot
Converts heat while cooking to charge a phone.
This product is discontinued now, I think the price was high for many people.
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8. What other companies have a product already built and why is this product not well known?
OnePuck
Claimed to use a Stirling Engine inside, started in 2013 this product never shipped.
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9. What other companies have a product already built and why is this product not well known?
Solar battery pack
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10. Would it be better if we changed our product to a wearable
Would it be better if we changed our product to a wearable? Why or why not?
Wearable
It might be, the current technology isn't really there yet for doing this thermally. Thermo-electric generators work best with a large difference in heat between one side and the other. Other options are motion-based generators in shoes, wrist band, etc.
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11. Expected Outcomes
The students need guidance and advice for how to proceed with their project. They would like insight into how to collect, store, and convert heat into electricity. They would also like to build some aspect of their product before the semester is done.
I would try this with the thermoelectric generator. The efficiency is low and you won't get a large amount of charge out of something like a hot beverage but it should work. The next step after that would be to design with a Stirling Engine which could be much more efficient but probably much higher cost, larger, and more difficult to design.
It is also an option to add solar charging, this works fairly well and is proven already.
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12. Thank You
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