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Using a Peltier (320W)

P

Parkre

Senior member
Okay, I am using a 320W pelt as a heat source for a heatpipe. This homemade heatpipe is huge. It has a 12in air hammer (copper tube for homes to absorb inconsistant waterflow) for the top going to a T-joint (where the pressure gauge is) to a 2 inch copper block (where the pelt is). On the cold side of the pelt, I have an aluminum block to cool (for a soda can to sit in).

After about 5 min, the pelt get cold (not freezing cold, but cool) and the heatpipe gets hot. around 70C. the cold side only gets around 18C (yeah, not cold).

The only thing I can think of is I do not have enough mass on the cold side. But if that's the case, then frost would form before the entire pelt started heating.

NOW the weird part, that 320 is measured at 12V. I am only running 1.7 volts through right now because the heatpipe doesn't seem like it can handle much (no fins could be the cause).

Anyone might know what could cause this??? Thanks
 
Peltiers will never be more than 65 or so C below the temperature of the hot side of the plate.

Lemme see if I've got the rest of what you've said correct...

You are running at 1.7 volts DC? That number seems kinda low!

You're using a air cooled unit that has water filled heat pipes, correct?
 
Maximum temperature difference is 69C, that's the theoretical difference--you can't ever get higher than that.

You need ACTIVE cooling to remove the heat from a peltier.

They're about 20-30% efficient, if memory serves me correct. [Vs 45% for fridges/etc.]

Stick a fan on that sucker.
 
MORE COOLING POWER!!!!!!!!!!!!!!!!! yup, more power. this is the first I have heard in a LONG time of someone using non active cooling (or even non water cooling) on a pelt.
 
Dude, you just need to cool it better. That monster you made isn't going to cut it. However, if you can pay for a huge slab of copper, why not just buy some water blocks?
 
Welll, the idea behind the experiment is the heatpipe itself. And it's filled with r134a (it was vaccumed out first).

Also one of the other lab groups is testing and analyzing the some of the waterblocks I built for my pc. The contact area is made of silver. They turned out nice.
 
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