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The downside of using a Phase change and/or extreme cooling - Page 19

post #181 of 204
Parylene you have to send out. They use a CVD (Chemical Vapor Deposition) process that is not something you can do at home (unless you have a high vacuum system lying around).

The other materials you should be able to use as a DIY project. I have used the tech spray material with a paint brush for prototype work in the past. In production we has an automated spray system that minimized our consumption per part.

If you can afford the parylene, it is well worth it. My contact at Kisco in the past would drop his iPhone in a cup of coffee to demonstrate how well it worked.

As for Act Nano, I know someone on their board of directors. I can make some inquiries, but I am guessing that price wise it will be higher than the tech spray.
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post #182 of 204
Wow can't believe that is possible biggrin.gif
Pretty amazing stuff!
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post #183 of 204
Or you could just use Vaseline and save yourself $300+
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post #184 of 204
Well yeah but either way it's amazing technology when you think of the applications, although it's pretty expensive.
Although when you expose your mainboard/processor to these kinds of conditions you can't expect it to last forever, doesn't matter how well it's been treated, exposing electronics to those kinds of temperatures is risky ! biggrin.gif
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post #185 of 204
You saw the results of Vaseline. I have used the stuff (parylene) and run electronics through a 6 week long salt spray test without a problem.

Some of the other materials are a lot less expensive (few $ range), but you have to pay more attention during application to make sure everything is coated. Get five friends (or mobos) together and you can get the parylene for a lot less. You pay by the run, not necessarily by the unit. If it all fits in the chamber then you're good to go.

Coat your entire system and you could run it submerged in water! even salt water. I have seen people commenting on wanting a submerged rig with fish in the tank, well this is the way to do it.

If you're going the grease route then I would go with silicone grease over vaseline anyways.
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post #186 of 204
So everytime we want to bench something new just throw $300 at it instead of $5 Vaseline.



Makes sense if you don't think about it.
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post #187 of 204
Thread Starter 
Quote:
Originally Posted by szeged View Post

So everytime we want to bench something new just throw $300 at it instead of $5 Vaseline.



Makes sense if you don't think about it.

If you are doing something like my rig... it makes sense.... if you are benching... nope.
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post #188 of 204
Kisco is also at the high end for parylene coating. If you want the absolute best then that's who you would use. Even then, get a couple of friends to get gear coated at the same time and the cost goes down fast.

Look around and I am sure you could find companies that could do a single mobo for $100. It is an extreme coating. I don't think anyone is going to need protection from 6 weeks of non-stop salt spray.

If you are going to be running a $1,000 CPU at sub-zero temperatures for long term, then its not such a bad investment. (JMO)
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post #189 of 204
Quote:
Originally Posted by LED Guy View Post

You saw the results of Vaseline. I have used the stuff (parylene) and run electronics through a 6 week long salt spray test without a problem.

Some of the other materials are a lot less expensive (few $ range), but you have to pay more attention during application to make sure everything is coated. Get five friends (or mobos) together and you can get the parylene for a lot less. You pay by the run, not necessarily by the unit. If it all fits in the chamber then you're good to go.

Coat your entire system and you could run it submerged in water! even salt water. I have seen people commenting on wanting a submerged rig with fish in the tank, well this is the way to do it.

If you're going the grease route then I would go with silicone grease over vaseline anyways.

I might be getting a bit off topic but how would you feed the fish without getting the water dirty? And as well as that their 'stool' going around in the water. Fish are sensitive to temperature changes as well so...
post #190 of 204
Obviously you just need a bigger tank so you have a huge thermal reservoir. The rate of temperature change will take care of itself then. Direct the outflow of the aquarium filter at the critical components that you want to keep cool (and clean).

The heat capacity of water is 4.181 J/g C. Say you have a really big (500 gallon) tank. That gives you tank with a heat capacity of about 8,000,000 J/C. If your system draws 1,000 W then assuming adiabatic conditions your rate of temperature increase would be 0.000126 C/sec or 0.45 C/hr. That is well within the tolerance of even sensitive fish.

Adiabatic operation (zero heat transfer to the environment) is the exact opposite of what you would want for the system. Still even with a wet/dry trickle type filter you should get great heat transfer to the air and not even need an external radiator. Your filter would active like an evaporative cooler, so you might want a small fan to give you good counter current flow in the filter area.

After doing the math, 500 gallons is probably overkill and you could get everything to work with anything over 150 gallons or so. It would depend a lot on the filter set up and air flow there. I'm usually conservative in my math and estimates so you might be able to go even smaller.

Feel free to check my math and see if I missed anything. 1 gallon water = 3785 g, 1 W = 1 J/sec
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