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Author Topic: immersion oil smoke coming out of the miner ...  (Read 354 times)
lucifsg
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October 29, 2019, 05:21:46 PM
 #21

And how could you cool novec ? Could you use a fish tank pump with it like i did with miral oil ?
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October 29, 2019, 06:09:51 PM
Last edit: October 29, 2019, 06:56:50 PM by NotFuzzyWarm
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 #22

And how could you cool novec ? Could you use a fish tank pump with it like i did with miral oil ?
NO! As said before Novec uses 2-phase heat transfer -- not just simple 'make some fluid hot, move fluid elsewhere, cool off and return to system'.
Does no one know how to use a search engine anymore?...
For a start, ref https://www.allied-control.com/datatank-container-unit-1-4mw/ and https://www.youtube.com/watch?v=a_vJbGgxPTU
Beyond that, search for "2-phase cooling".

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November 03, 2019, 07:18:06 PM
Last edit: November 04, 2019, 12:40:08 AM by frodocooper
 #23

A took a look elsewhere and what i got is this:

Novec immersion needs a sealed tank, you just fill it enough to submerge your electronics, then close it air tight. Novec will evaporate and return to liquid state on its own. No pumps.

But, you have to keep it well sealed. That could be tricky...

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November 06, 2019, 03:21:43 AM
 #24

That video link is amazing - here's another one.

https://www.youtube.com/watch?v=YyKIZPuepl8

The fact that it circulates itself with the boiling and condensing back into the pool is awesome. Just need some way to get the heat out of the tank. One of them uses a water circulated external cooler to cool the area inside the sealed tank. Some of the review videos look more like an open tank setup with condensation bars which are removable - probably more manageable than the sealed off tank. Not sure how much 'pressure' there is or if it's more of an atmospheric chamber of low pressure. Very fascinating.

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November 06, 2019, 03:39:28 AM
 #25

That video link is amazing - here's another one.

The fact that it circulates itself with the boiling and condensing back into the pool is awesome. Just need some way to get the heat out of the tank. One of them uses a water circulated external cooler to cool the area inside the sealed tank. Some of the review videos look more like an open tank setup with condensation bars which are removable - probably more manageable than the sealed off tank. Not sure how much 'pressure' there is or if it's more of an atmospheric chamber of low pressure. Very fascinating.

I suppose you could add heat sinks or such to the walls/ceiling of the tank. Problem with not sealing it is you would lose much of it and Novec is not exactly cheap...

Using a regular water cooling method to remove heat from the top (inside?) of the tank also sounds interesting, sealing everything afterwards is tricky, you need to seal the holes for wires and the water cooling tubing for the tank. I guess that's the most efficient method.

You are right about pressure, would be interesting to check it once the thing is closed and cycling. Possibly lowering the pressure a bit is needed to keep things balanced. So add another tube to pump some air out and some pressure meter Smiley

If the ceiling is metal (aluminum, copper or silver Smiley), with a (water) heatsink, maybe you don't even need the water cooling to get inside the tank at all... I'd do the whole thing in copper (or at least the ceiling upper walls) with maybe a little window to inspect Novec liquid level.

Also tank size ratio probably affects efficiency. Smaller tanks for individual miners, a few miners per tank? There is probably an efficiency ratio in there.

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November 17, 2019, 09:11:03 PM
 #26

Cheapest way to make Fake fan circuit you can find on this link.

Work very good.

https://www.techidiots.net/notes/fake-fan-sensor
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November 17, 2019, 11:53:42 PM
 #27

Quick question: Wouldn't you want to remove the fans completely and open the box up as much as possible in the oil? Otherwise I could see hot spots forming near the chips which would result in bad things.

Does the oil need to circulate in the tank, or can it be quiescent?
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November 18, 2019, 01:58:08 PM
Merited by frodocooper (2)
 #28

The oil needs to circulate, depending on the viscosity simple convection will do the trick assuming the tank has fins on it. Think pad-mounted utility transformer: the fins on them are hollow and connected by pipes to the tank. Hot oil rises, flows into the pipes and as it cools in the fins falls to the bottom, through the outflow pipes back into the tank.

For bitcoin to succeed the community must police itself - Joshua Zipkin aka Joshua Alexander leaked AMT A1 miner skype chats
How a miner mfgr SHOULD operate: HaggsFIN trip to Canaan My info useful? Donations welcome! 1Fuzzyk398kDWVjuC5qPX5v6CjSkvbgAbd
-Support Sidehacks miner development. Donations to:   1BURGERAXHH6Yi6LRybRJK7ybEm5m5HwTr
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