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Heatsink a little smaller than peltier. How to address?

post #1 of 3
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Hi, I'm trying to set up a Peltier 12706 cooler in a DIY project and it's just a few mm too small for the Arctic 64 heatsink I have:

This is all craigslist-sourced stuff for a hobby project, so I want to try to finagle this heat sink and not buy anything additional.

Will I destroy the peltier device if the edges are sticking out without direct contact to the sink? If so, what's the best way to address this? I was looking into copper shims, but people are saying this may greatly decrease the efficiency of the heat transfer. Interested to hear what ideas people have. Thanks!

Ismail


post #2 of 3
Here's my experience, judge for yourself:
*same situation, bigger Peltier than the surface of the chip
*but my chip is a DSP that dissipates something like 10W (obviously such a chip can be aircooled if the air is cold, it happens that the environment is 120°C so it needs the Peltier to be kept under its max Tjmax of 110°C)
*test at 25°C: the edges of the Peltier are about 10°C hotter than the bottom/interface of the heatsink with the Peltier. The total dissipated power is the 10W of the DSP and 5W from the Peltier, the heatsink is active cooled.

Based on this I'd say since your Peltier doesn't surpass chip/HSF surface by much, then the ceramics conduction should be enough to keep the edges cool enough. The semiconductor in the Peltiers I have is supposed to hold 150°C, so even if you have some fringe temperature slightly high (say 100°C CPU + 20°C delta being aside) it should still work. My suggestion is you should take some precautions while testing with lower than max heat dissipation; to keep safe you could place a fan temporary towards the CPU socket and vary the airflow to see what it does for the CPU and Peltier temperature. An IR camera it'd be golden rolleyes.gif
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post #3 of 3
You could always throw a quarter inch copper block between them to act as a heat spreader, take some sand paper to the edges making it into a pyramid and mate flush with both sides. That should keep the heat distributed evenly enough.

-Z
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