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Now, just so we’re clear, this isn’t my crazy pipe dream. Engineers have been working on ways of reclaiming wasted energy for years, first through “dumb” methods that capture waste heat, and more recently using microelectronic and nanoscale devices that capture energy from your every movement. In Sweden, for example, Stockholm’s Central Station uses heat exchangers to convert commuter body heat into hot water, which is then piped to an office building next door — an approach that could easily be replicated in shopping malls and supermarkets around the world. Last year, we wrote about a piezoelectric film — a material that you can place anywhere to produce electricity from the smallest of movements, such as typing on a keyboard or the swing of your arms as you walk. The University with battery like IBM ThinkPad 240 battery , IBM ThinkPad 240Z battery , IBM ThinkPad A30 battery , IBM ThinkPad A31 battery , IBM ThinkPad 600 battery , IBM 02K7016 battery , IBM ThinkPad G40 battery , IBM 08K8026 battery , IBM ThinkPad T21 battery , IBM ThinkPad T20 battery of Wisconsin has created a special shoe that uses electrowetting to produce 10 watts — a huge amount of energy — just from walking.
The only reason such energy harvesting techniques aren’t widely used is down to the relative immaturity of the tech. In the case of piezoelectric generators, they produce minuscule amounts of electricity that struggle to power a computer, let alone a sensor. While it’s easy to capture body heat on a grand scale, such as in Sweden, there’s still no easy way to harvest large amounts of waste heat on a local, wearable scale. There is even one research group at the University of Southampton that is using the human heart itself — the flow of blood passing through a turbine — as a power source for a pacemaker. Even there, though, their technique can only capture 17% of the power required (and a pacemaker requires very little power).
We also need to find out just how much power we can safely harvest from the human body — a child might only be able to provide 5 watts, while Usain Bolt could probably power a small family home, if you kept him pumped full of Mountain Dew. There might also be the possibility that drawing too many watts would force your body to burn up fat supplies, which would make for a very geek-friendly diet.
In short, human batteries are coming — it’s just a matter of time and research. The first people to tap their bodies for power will probably be soldiers, who are often lumbered down by tons of equipment, including bulky batteries. If a few watts can be reclaimed from their body heat, or the movement of their backpack, then their quality of life could be significantly improved.