Electricity Generated By Body Heat?

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The human body may be the greenest source of renewable energy yet. Body heat leaves our body at an astounding rate...but what if we can recapture that energy? Welcome, to thermoelectrics!

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Thermoelectricity and the Human Generator

[quarksamurai]

One post shared on reddit in right time and people are gonna apreciate all the good videos you make

[benbraceletspurple]

I'm looking into this for human powered flight.

[mbbag]

Great Video, thanks for the inputs. please beware: at 2:33 you state "we waste 65W per second". Watt is already a measure of energy exchange (Joules per second). Watt per second would be Joules per second squared, some sort of "energy flow acceleration" which is probably not what you meant. Also, at 5:38, the watch is a heat exchanger, not a heat pump. A heat pump transfers net heat thanks to work supplied by a compressor.

[daemonnice]

if you understand temperature properly from a physics perspective, it represents kinetic energy, therefore, a temperature differential equates analogously with an electric potential gradient.

[oliverscott]

When I'm in winter, the heat gets transfered from my hands to the rest of my body to keep me warm, and my hands get cold. So I will have to wait next year to try that experiment.

[noelandrew]

A simple version of this that i'm Surprised you didn't mention, Thermocouples, where two wires of different metals are twisted together and produce an electrical charge when heated, its the science behind the contact thermometers that come with most digital multimeters. the output changes depending on the amount of heat, and these changes are how we use to differentiate temperature electronically before the the IR laser Thermocouple was created. its a fascinating area to research and won me a major Science fare when i was younger.

[kennethstudstill]

1:12 Thermoelectric power plants use steam turbines to make electricity. Using the seebeck effect on waste heat from power plants appears to just be a concept.
3:16 3:30 Both voltage and current must be known to calculate power.

[ARandomTroll]

"we lose 65 watts every second to heat energy" so basicaly our energy output is growing... wonder when i will start to glow like a light bulb

[hopLight]

On top of the great content, you included probably the least annoying and most seamless advertisement for a company. Looking into their watches now!

[JustinTopp]

I love your videos man please keep them up. I want to eventually make a 50+ watt thermoelectric generator. You should make a microbial fuel cell

[Plasma.Prince]

3:00 Is there any internal circuitry? An Inverter? A Transformer? Or is it just a thermoelectric circuit?

[GhostsOfSparta]

Would be amazing if we able to generate plasma arc using human body heat!

[thygate]

600 AA batteries per day sounded a bit much, so i thought i'd check ..
E = P * t = 60 Watt * 24 h = 1440 Wh of energy consumed by one human that is idle for all of one day. (1440 Wh * 3600 = ~5.2 Megajoule or ~ 1250 kcal)
A typical AA alkaline battery has a capacity rating of 2500 mAh, at 1.5 Volt that gives it an energy of about 2.5 Ah * 1.5 V = 3.75 Wh
1440 / 3.75 = 384 AA batteries worth of energy are consumed by a human doing nothing all day.
Given that some sources list 3100 kcal/day for an average human, 600 seems quite reasonable.

[rainbowsprinkles]

A Peltier-Seebeck device can operate either as a heat pump xor a heat engine, but doing both simultaneously would not make thermodynamic sense. It can either use electric work to pump heat at cost of adding some waste heat of its own, or it can harness movement of heat to do electric work in exchange for increasing thermal resistance- though the latter cost can be partially or even more than fully offset by the installation providing a path of lower thermal resistance than otherwise, as is likely to be the case with a metal-bodied watch! Both have tremendous potential usefulness, it's just that, more or less like any reversible heat engine, it can only operate in one work direction at a time. The cost of increased thermal resistance when generating electric current would prolly be awesome for applications where human bodies need additional thermal insulation, such as in cold weather!

[deeznetz]

Did you know the seebeck effect is reversible. Whereby you could reverse the charge flow by reversing the heat and cold? Dr. Tennant states you need -25mv to function optimally and -50mv to heal or make a new cell. The mv equate to ph level.
Can you do a video on induction? Or explain how I can pull -25mv out of the air to charge me up?

[lioakira]

I want that powerwatch S2, but the price is forbidding for Brazilian reality.

At 1:18, I found some papers about wast power plants using thermoeIectric effect, but is there some active anywhere? Most of waste or any type of thermal power station don't uses thermoelectric effect, because they work indirectly. Chemical/Thermal -> Kinetic -> Eletric.

;D

[sreejithajayakumar]

Can you make the DIY of the Tesla coil shown in "Tesla Coil vs iphone"???

[Plasma.Prince]

I'm getting ideas!!! You could feed this power through an inverter, then feed that AC power outputted from the inverter into a high voltage transformer. Feeding that 1.5 volts through a regular 12000v NST would supply a 150v of AC power. Which can be further stepped up with another transformer!

[mykulpierce]

try carbon and aluminum as the two materials!

[rembliekain]

Hey maybe you can show us how to make a wrist band with a usb port that can convert body heat in to more than enough energy to charge a phone, using parts easily found at a local hardware store or fabric shop.