Hot face cooling for Peltier module

[Forhorse]

I have one lying around in the garage, salvaged from an old vacation center. I never tried it, it should.
it has the triple connection 230V / 12V / gas but I think that this kind of fridge is mainly efficient on gas, right?

[THAD]

Thank you for the feedback, but I wonder especially if a coolant for example like for the engines of the cars can cool the hot face if it runs in a closed circuit. In fact my question is: do you know of ways to cool the hot side of a peltier, without consuming electricity (or very little), and without taking up too much space? Yes I know it sounds impossible said like that, which is why I think a coolant isn't such a bad idea.

Thank you for your advice

THAD

[eclectron]

Thank you for the feedback, but I wonder especially if a coolant for example like for the engines of the cars can cool the hot face if it runs in a closed circuit. In fact my question is: do you know of ways to cool the hot side of a peltier, without consuming electricity (or very little), and without taking up too much space? Yes I know it sounds impossible said like that, which is why I think a coolant isn't such a bad idea.

Thank you for your advice

THAD

It is to deport the problem.
Either you have an inexhaustible source of cold enough liquid,
Either the liquid must be cooled, which involves a circulation pump and a radiator plus a fan for the radiator.

As said yesterday, the Peltier makes a lot of heat (consumes a lot) to cool little.
There is really a lot of heat to dissipate.

You don't say what cold temperature you hope to reach and what is the cold temperature source that would allow you to cool the peltier (the ambient air, a stream, ...?)

[THAD]

I hope to get to -20 degrees on the cold side and + 20 degrees on the hot side so this is a small / medium performance peltiers, the peltiers would be battery powered, and I would hope to release the most heat with mini fans, + a closed circuit and small pump with coolant: definition: heat transfer fluid used, in a generally closed circuit, in order to remove heat from a system which produces more than it can evacuate naturally.

If the liquid is able to cool a car engine, would a small amount be enough to keep 20-25 degrees on the hot face?

Couldn't it work?

[THAD]

And the coolant comes into boiling temperature at 108 ° C. With a medium performance peltier there is no chance that the liquid will reach this temperature. This is why I would like to do without radiators + fans. My device would not be used continuously which would allow the liquid to cool quietly for a new use.

[THAD]

Does anyone specialize in or know themselves very well in Peltier modules?

[eclectron]

In practice, it is difficult to obtain a temperature delta greater than 20 ° C between the hot side and the cold side.
if you aim at -20 ° C on the cold side, the hot side must be at 0 ° C .... voila, it is folded.

specialist is saying a lot but I made a realization: a micro oven -55 ° C / + 125 ° C.
To reach s-55 ° C, the hot side was cooled by .... freezer of a fridge which already went down to -22 / 25 ° C (from memory).

Peltier stacks are also possible, it looks like a step pyramid, inverted

[THAD]

Thank you electron, I will explain in summary, I want to tinker with a very thin device (a little bigger than the width of a Peltier module). So impossible to add a radiator or stacked peltiers (pyramidal).

I tell myself that coolant is not so stupid is it?

[THAD]

What would you think would be the best way to drastically cool the hot face and which takes up the least space and consumes the least possible energy? Yes I'm aware it's not easy at all

[eclectron]

Thank you electron, I will explain in summary, I want to tinker with a very thin device (a little bigger than the width of a Peltier module). So impossible to add a radiator or stacked peltiers (pyramidal).

I tell myself that coolant is not so stupid is it?

Yes, coolant, but it's little different from water.
it is essentially the freezing point that changes, which obviously does not interest you.
Just because it says "coolant" doesn't mean it has unusual cooling properties.
Between 0 and 100 ° C, you take water, it does the same job.

coolant or water, are a heat transfer fluid, which transports the calories from point A to point B and must absolutely be evacuated at point B.
A metal conducts heat even better than water, but the heat must be evacuated somewhere.
Your problem is where to evacuate the heat in the end? and then how?
the temperature delta value of 40 ° C that you want to reach is impossible to achieve with a single Peltier.

in this video, if he let the experiment run longer, the finned radiator and water would get hot and the cold side would heat up.
For this to work properly at all times, the water must be cooled.
What he says about the thermal paste is also very important, we quickly lose degrees of differences.

What you want to do (40 ° C difference) is impossible.