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Hi all,

I was looking how to heat an electrolyte in order to study a sample with a microscope and I found about the Peltier modules. My problem is that I need an specific Peltier module. It has to be cylindrical.

Have anybody seen something like that? I have been surfing and trying to gather information, but I could not find a supplier.

I am open to suggestions.

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Sounds to me like a Peltier is kind of a backhanded way to heat something. You have to cool something to make heat. Peltiers are designed for cooling. You add energy (electricity) and they get cold. The heat is just a byproduct.that you have to deal with.

What not just a heater? How hot, maybe you know how many watts you need?
A round heater would be much easier to locate that a round pelt.

How about one of those coffee cup coaster style heaters? Maybe on a rheostat to control the temp?

 
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how about just doing it like it has been done for decades... wind a spool around object, add electricity.. spool gets hot... this is how a toaster, a watercooker, almost any heating element works



Or, if you want to be more fancy and play with magnetic fields... try induction heating, then you can set ice aflame
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you won't find an off the shelf cylindrical peltier, but you can improvise by machining a cube of aluminium with a cylindrical hole in the center, attach 4 standard tecs to the 4 flat faces of the cube with the cold sides facing in and attach a heatsink to the hotside of the tecs and use screws into the alu cube to clamp down, try to thermally isolate the screws from the heatsink.

EDITED: to remove ideas re heating the cube as OP wants to cool the inside face.
 

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Quote:
Originally Posted by fego View Post

I'm looking for a cylindrical Peltier where the outside gets hot and the inside cool.
Does it exist?
You could make an arrangement where four long rectangular elements form a square, the inside is in contact with a conductive tube and the outside is in contact with a machined piece with the cube being on the faces adjacent to the peltier elements and the outside being cylindrical... But that will be quite a thing to get machined, and not cheap.

Arrangement such as:



Center orange piece is the square with a circular center bore to be machined, outer orange piece is the tube with a square center bore to fit the outside of the peltiers.

All in all, not cheap to make and you're probably better off with a traditional heater unless you do need the cool bit to be down the center for some reason.
 

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maybe wrap some nichrome wires around it and run a small current over the wires.

its basically the stuff inside heater elements
 
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