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Author Topic: Oil Submerged Configurations Discussion Thread  (Read 13781 times)
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Bicknellski (OP)
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July 12, 2013, 10:11:39 AM
Last edit: July 12, 2013, 10:23:33 AM by Bicknellski
 #61

https://bitcointalk.org/index.php?topic=179769.msg2712907#msg2712907

Stealing from the water block ideas... muhahaha.

The MO-RA3 is a heat exchanger featuring excellent cooling performance and various possibilities of application. Its reliability allows for usage in workstation and server environments and it is sturdy enough for industrial applications. And, of course, it is powerful enough to cool even the hottest gaming PC. True to the slogan “there is no replacement for surface but more surface”, the MO-RA3 uses 36 m copper tubing and 3.0 square meter of aluminium fins for excellent heat transfer from cooling fluid to ambient air.

The cooling fluid passes the 72 tubes in a four-time parallel layout. This design and the flow-optimised connection block ensure a low flow-resistance, despite the large size of the heat-exchanger. The connection block improves flexibility as well by providing G1/4“ threads in three directions. The fins of the MO-RA3 have been optimised specifically for low-rpm fans. Their enormous surface and effective geometry guarantee excellent cooling performance.

Possible fan configurations

MO-RA3 420 LT

Nine 140 x 140 x 25 mm fans

MO-RA3 420 PRO

Eighteen 140 x 140 x 25 mm fans

http://shop.watercool.de/epages/WatercooleK.sf/en_GB/?ObjectPath=/Shops/WatercooleK/Products/25120


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July 14, 2013, 05:43:54 PM
Last edit: July 14, 2013, 06:02:43 PM by Bicknellski
 #62

Doing a little layout work...




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ultrix
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July 14, 2013, 09:03:19 PM
 #63

I was thinking something like this but as a fiberglass unit.



Recycling all the rage... what about an old freezer? http://webpages.charter.net/redusc/Freezer.html Don't drill through the walls for piping.




Almost all mineral oil distillates degrade HDPE, LDPE, acrylics, etc.   I would avoid plastic and stick to steel as its cheap, easy to work with, and structurally sound.

Also with regards to radiators/pumps.  Again, I'll say avoid PC cooling crap (emphasis on crap).  They all use poor gasket material (EDPM, which swells when it comes in contact with most oils), most have plastic impellers, and provide zero characterization data.   If you use it, you'll be guessing and waiting for failure.  Engineering post component selection rarely provides correct or efficient designs.
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July 14, 2013, 09:06:09 PM
 #64

Also, focus on getting the heat outdoors.  What is the point if you're still blowing it in the room to be dissipated by the air conditioning unit?   You should focus on a model similar to the portable air conditioner units that have window mount exhausts, only in this case, window mount radiators.   Even in extreme environments, like Arizona/New Mexico, you're still able to air exchange the heat and keep the oil at < 55C.
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July 14, 2013, 09:18:58 PM
 #65

Crystal Plus 70T Mineral Oil

http://www.steoil.com/wp-content/uploads/2011/04/70T-MSDS.pdf

Anyone else got some MSDS data sheets on different potential mineral oils or transformer oils?

That's only food grade mineral oil and lacks characterization with regards to flash point, PBA content, material interaction.  It would likely attack solder masks and bonders on and in PCB.

76 Transformer Oil - cheap, easy to find
http://www.conncoll.edu/offices/ehs/EnvhealthDocs/Transformer_Oil.pdf
DSI Opticool - hard to find, apparently good stuff
http://dsiventures.com/wp-content/uploads/2013/02/PDS-Opticool.pdf

With regards to volume, 55 gallons is about the smallest you can find.   Usually transformer oil is sold by the tanker (~10k gallons).  It requires 350 gallons to fill a 42U rack sized tank.

I've been meaning to experiment with EDM fluid, as it has similar requirements to transformer oil in its primary function and is available in 5 gallon pails.  However, this being said, its $25USD/gallon in pails.  The only reason I'm suggesting this unknown is it may give opportunity to experiment instead of making conjectures about infeasible things like plastic bathtubs, horse laxatives, and $10 chinese pumps that water cooled PC folks pay $90 for.  Thermodynamics and fluid dynamics are sciences not something you come up with an end all solution without calculation, experimentation, and process metrics and refinement.


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July 14, 2013, 09:21:20 PM
 #66

maybe the pads might be the best route.
http://www.frozencpu.com/products/17467/thr-178/Fujipoly_Ultra_Extreme_System_Builder_Thermal_Pad_-_Full_Sheet_-_200_x_150_x_05_-_Thermal_Conductivity_170_WmK.html

The best you can buy, and should do ~400 chips each sheet, if you cut them small enough. Don't need a whole 1/4 sheet to cover the whole board, esp since these are wicked expensive.

Sure there are cheaper alternatives directly from China.

http://www.aliexpress.com/item/5Pcs-lot-30CMx3CMx0-3MM-Thermal-Pad-CPU-GPU-DDR-RAM-CHIP-3320-01-05/632016505.html

US $3.22 / lot
5 pieces / lot , $0.64 / piece

But... 17.0 W/mK vs 3.2W/mK ...

If i had 400 chips to use up 1 expensive sheet (and all the time in the world), id put the expensive one just under the vias, use the cheap sheet (with holes) for rest of the board.

Those sheets will degrade in oil.  More correctly they will swell and then dissolve.  As will thermal grease.  You want indium foil.  Its expensive, but you don't need much per IC.  Alternatively since the heat per area of the IC in this application is low, why not just lap a copper shim?


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July 15, 2013, 06:00:19 AM
Last edit: July 15, 2013, 05:58:21 PM by Bicknellski
 #67

Also, focus on getting the heat outdoors.  What is the point if you're still blowing it in the room to be dissipated by the air conditioning unit?   You should focus on a model similar to the portable air conditioner units that have window mount exhausts, only in this case, window mount radiators.   Even in extreme environments, like Arizona/New Mexico, you're still able to air exchange the heat and keep the oil at < 55C.


That's an opaque wall in the diagram, I guess, is hard to see but I put it between the tank and heat exchanger obviously we would put the heat exchanger outside. Not much room on tinkercad workspace. We will source as you have instructed and update the list. In terms of getting huge orders of oil don't think that will happen not as easy here in Indonesia to source things like this so we will do what we can. Worry about getting bamboozled on the oil. I will try and get a tank that does less than 350 gallons but will need to see on prices. I don't have the resources and need to have something smaller that I can manage.

Also what about fiberglass tanks they should be ok would they not?
What about PEX pipes as they are much easier to fit and manipulate are they prone to degrading with this oil?
Oil or Hydraulic Pumps?

Notes:

Indium under the heatsinks or a copper shim.
Heat exchanger all metal properly engineered.
Transformer oil as specified.
Steel tanks (Fiberglass?).
Fittings and pipes metal (PEX?).

Do proper calculations before parts purchased.

Quote
"Thermodynamics and fluid dynamics are sciences not something you come up with an end all solution without calculation, experimentation, and process metrics and refinement."

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