15-year-old Canadian girl latest invention manufacture an environmentally friendly energy saving flashlight, using only the palm of heat emission, if the Google Science Fair Jury appreciate this invention, is expected to grant its super Invention Award.
Keywords: Peltier thermoelectric effect tiles LED Flashlight
According to foreign media reports, the 15-year-old Canadian girl latest invention manufacture an environmentally friendly energy saving flashlight, using only the palm of heat emission, if the Google Science Fair Jury appreciate this invention, is expected to grant its super Invention Award.
Canadian girl Ann - Marco Brzezinski (Ann Makosinski) in 2012 took part in another science fair, she is exhibiting another flashlight, using kinetic drive LED lights, the one she hopes invention work through the thermoelectric effect flashlights, small amount of current can be generated between the surface of a material cold.
She said in an interview: "I believe we have had a nasty experience when we urgently need the torch, has not been able to find a flashlight without batteries can imagine that, if we do not use the battery flashlight , will avoid a lot of toxic batteries buried in the soil. "
Led scientists to suspect that the human body can produce enough heat to maintain a flashlight battery, the girl did not use the latest design flashlight body full of heat, the heat is only palm it.
First, she measured the palm about 57 milliwatts to generate heat energy to maintain the power required LED lights around 0.5 mW; Next, she uses another assembly - Peltier tiles, when the side of the heat and cooling the other side will produce current; Eventually she Peltier tiles and the circuit connected to a hollow aluminum tube, the tube can be cooled by a Peltier gas tiles, tiles while heating the other side of the palm, in this temperature Effect can produce electricity.
LED torch light is very soft release, but enough to find your keys or illuminate a book page, a test, she uses flashlights about half an hour, when the ambient temperature is about 10 degrees Celsius, according to the temperature difference can determine flashlight length of time.
She said: "At present this is only a prototype flashlight, and then will be put into production, but I designed components is very powerful, of course, if it is put to use and manufacture, I will try to wrap up the electronic components sealed so It does not in contact with water and other substances, in order to use a longer time. "