Hi, guys welcome to electrical projects channel.
Today I’ll show a really cool device…
I mean it is so cool that it can make ice.
It is a thermoelectric cooler, also known as Peltier device.
If you connect this device to a 12V DC power source, one side of this device becomes very
hot and another side becomes very cold.
Since one side of this device becomes very hot I’ll need to use a heat sink.
Without a heat sink, one side of this device becomes too hot to touch in a couple of seconds,
so good cooling is important here.
In order to make heat transfer even better, I’ll use some thermal paste.
So, let’s apply some thermal paste.
Now let’s press on it, and we’re almost ready to make ice.
For an even better heat sink cooling I’ll put it in the water.
Now let’s connect a 12 Volts power supply.
Now, let’s connect the second wire and cooling starts.
Now it is cooling…
Let’s put some water drops here.
Oh hell, my finger sticks, it is really cold.
Let’s disconnect it and look at ice that we’ve made.
Homemade ice without a fridge.
Well, let’s try it again.
I wonder what would happen if you touch it with your tongue?
Well, probably this video would become much more interesting, but we’ll leave it for
another time.
Now I should disconnect it.
Ok, now let’s be more scientific, so let’s use a temperature sensor.
Test… works fine.
Let’s apply some thermal paste to it.
Now, let’s connect it and take some measurements.
Wow, -14 degrees celsius...
let's disconnect it
So, the lowest is -17 degrees Celsius,
wow!
and at the start, we had 20 degrees…
well, let’s do it again.
The water a little bit warm now.
Well, it seems that it is not going below -17 degrees.
Let’s disconnect it.
The water is warm, and it ok considering that this device consumes 55 Watts of energy.
But the really interesting thing about this device that it can work in reverse, we just
need to make temperature difference.
And that’s what I’m going to demonstrate now.
For the first demonstration, I’ll connect a small 5V DC motor.
To make temperature difference I’ll use a lighter.
Pretty cool isn’t it.
Now, let’s see how much voltage it makes...
well it is just 0.6V…
Let’s measure short-circuit current…
well, it is 0.14A
Well, current is OK, but the voltage is really low.
0.6 Volts seems to be enough for the motor to start rotating, but it is not enough for
example for an LED.
To make LEDs work with 0.6V we need a voltage booster.
Well, some time ago I’ve built one, it really simple it uses just one transistor,
so let’s connect it and test it.
Well, it works…
And that is all for today, don’t forget to like this video and subscribe to my channel.
Thanks for watching!
See you next time.