Need a charge?
Island Pacific School
Floor Location : J 046 N
The main purpose of my project was to create a phone charger that runs solely on the the differential heat temperatures (example: Hot water with cold water). I wanted to create the charger so that it generate its own electricity without wasting electricity that could be used on something else, because if you think of all of the electricity that is used to charge your phone for a year, that would be a lot of power gone. Also say you're in an emergency like camping, for instance; you break your leg and your phone is dead, how will you contact emergency if your phone is dead.
The way that I made my project was that I took a peltier element, ran 10 tests without the aid of any power booster and recorded the voltage. Then I put something called a joule thief and attached it to the peltier element. A joule thief is something that creates a buildup of electricity and releases it. This increases the voltage. Then I ran 10 of the exact same tests and measured the voltage and filled out the data. Then I took the top 5 highest voltages with a joule thief and checked to see if I could get a slight charge or in my case a lower rate of decreasing battery life.
I thought that the peltier element will charge a phone but it will take about a day to get around 50%. I also thought that when ice water is used to cool one side of peltier element and hand heat to heat the other side it will charge the phone the best and become the most efficient. The reason I thought this is because it will create the most efficient polarity change, and the most convenient. Also I thought with the joule thief the phone will charge faster because the joule thief will allow more voltage to charge.
During all of my tests, I didn't get a high enough voltage to charge a phone. The highest amount of voltage was 0.289 volts or 289 Milli-volts and that was using "Hot water with room temp air".
During all of my tests I was surprised because the hot air polarities with a temperature difference greater than about 20 degrees Celsius (a peltier element generates the most efficient amounts of electricity when the temperature difference is of about 20 degrees celsius) would be less efficient in terms of voltage.