25mV Joule Thief powered by peltier merely using our body heat -Free energy 24/7

[e2matrix]

Yikes DTF!       Glad you are okay and hopefully still have power there.   It's times like this everyone could really benefit having a good independent-of-the-grid energy source. 

[conradelektro]

@DreamThinkBuild: very nice picture of the snow chaos in your garden, hope you will be able to clean up without too much trouble.

The heating elements are very nice and interesting, because they seem so sturdy and easy to use.

But I would not heat up (or cool down) a Peltier Element by help of electricity because the efficiency of a Peltier Element lies between 4% and 7%. So, one wants to use heat (or cold) which is just there for free like from the sun or the warmth from a combustion engine or the cold from the snow.

Greetings, Conrad

[scratchrobot]

I made a mini version 

http://www.youtube.com/watch?v=wbfd0k8FzmE

[conradelektro]

I made a mini version 

http://www.youtube.com/watch?v=wbfd0k8FzmE

@scratchrobot: very nice build.

How long does it take till the cold side of the Peltier Element (which is not touching your body) becomes as warm as your body and the LED stops glowing?

The experiments I did (either with body warmth or with heat from an oven or with heat from candles) showed that cooling is the big problem. It is very difficult to keep the cold side of the Peltier Element cold (after a few minutes).

One would have to pump a lot of cold water passed the cold side to transport the heat away. In real technical solutions one sees very big heat exchangers.

Greetings, Conrad

[scratchrobot]

@scratchrobot: very nice build.

How long does it take till the cold side of the Peltier Element (which is not touching your body) becomes as warm as your body and the LED stops glowing?

The experiments I did (either with body warmth or with heat from an oven or with heat from candles) showed that cooling is the big problem. It is very difficult to keep the cold side of the Peltier Element cold (after a few minutes).

One would have to pump a lot of cold water passed the cold side to transport the heat away. In real technical solutions one sees very big heat exchangers.

Greetings, Conrad

It runs only for about a minute or so, i also tried the other side of the peltier against the window to cool it and get about the same runtime,
Maybe if i keep one side warm with my body and cool the other side against the window it keeps running 

Greetings