What is the CFM of the Front fan and the rear fan of the Ant miner S9?

[QuintLeo]

Dont use tarps. Use foam board insulation to build your hot isle. Tarps have no structural rigidity and will just make a mess of things.

How about Drywall? Thanks.

 Drywall is almost always FIRE rated, it WILL handle high heat levels if it's properly installed.
 Down side is that it's not very strong structurally - it needs a solid frame and optimally something like plywood to back it for strength, or you risk poking holes in it pretty easily.

 Foam board insulation is NOT generally fire rated (I'm not sure if fire-rated foam board EXISTS), and doesn't handle high heat levels as well.

 Tarps are a bad idea, even if they are hot temp rated - they flap around too much. Tolerable for TEMPORARY situations but I would never use one in any sort of a permanent installation.

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[Philopolymath]

I think you guys are in hot moist climates are in for a rude awakening...if you are not more careful.

Tarps.... bad idea
Drywall/gyproc...GOOD idea.... cheap but pain in the ass to cut nice custom holes in ...
Foam insulation..good idea..cheap easy to cut custom holes...BUT high temp fire resistant foam IS expensive...

If you think you need fire resistance chances are your op temps are so hi you miners will be dead in no time anyway..



And you still need to vent the hot aisle outside...that means ANOTHER high volume fan...
Or are you planning to just have the hot aisle exposed to the wind and rain sunshine insects etc...that would be very dumb...

And you still need to supply the sealed box (Miner house) with LOTS of CLEAN COOL DRY AIR..that will be expensive...

Don't mean to discourage you....just a reminder that operating environment has a HUGE impact on effectiveness and longevity of components.

[NotFuzzyWarm]

About filtering the air, mainly just need to keep out bugs, leaves and other floating bits of Nature. Just find some of the threads about the various mines and look at their pics. Most use a wall of filter material. At home could of course use a bunch of furnace filters but best would be getting wide rolls of air filter material and support it on frames. Check McMaster or others for it, typically available on rolls up to 48" wide and near dirt-cheap.

If the local humidity permits that can easily be expanded to also become a very large evap cooler system... You already have the sir flow, just add a water drip or spray system along the top of the filters.

edit: If doing evap of course build the filter system to be wet....

[QuintLeo]

Dry air is NOT critical - I've yet to see any miner that wasn't specified to 80% or higher humidity for operating conditions.
Just need to keep the humidity low enough that you don't get condensation at the intake.

 Furnace filters work fine - a common 20" x 20" furnace filter is an almost PERFECT fit for most common "box" fans.

 Dripping on top of those filters = VERY BAD idea, they are PAPER filters they don't handle getting wet like that.
 Might work OK with fiberglass-based filters, but those don't FILTER very well.
 They probably would work as an evap pad, but not nearly as well as a standard Aspen type pad (lots less surface area).

 
 I concede that the MINERS don't really need the good filtering I insist on - it's more about avoiding my own problems with sinus issues, especially with the very very high smoke levels my area has suffered through a lot of this summer.

[GMPoison]

@QuintLeo: I wish I were a good drawer so I could convey my idea for the tarp usage better, I can see it perfectly in my head but it's very difficult to explain to other people haha. There is a company online that makes custom tarps that are relatively inexpensive that allow you to choose the material they use for insulation. They could be sized perfectly to be attached flush to the back of storage racks that the miners will be sitting on, with holes cut directly where the miners will be sitting for exhausting the heat directly out of the "makeshift insulated room". Using them this way, the tarps wouldn't flap around at all, as they would be secured flush to the back of the racks as an insulation barrier and way to direct airflow from a portable industrial AC, that way the entire warehouse space doesn't need to be cooled, just this makeshift insulated room where the intakes for the miners will be.  

@NotFuzzyWarm: As far as intake air goes I won't be worried about using the garage door to suck hot Florida air in, but rather use that for exhausting the heat out. One of these feeding directly into my little "makeshift insulated room" idea seems like it would work well as "intake air", that way the entire warehouse space doesn't need to be cooled, but just this tiny insulated room where the miner intakes are. Then some large drum fans exhausting all of the heat out that the miners produce, which would never be recirculated into their intakes as their exhaust would be fed directly out of the small insulated room via the holes cut into the tarps, attached to the racks.

[NotFuzzyWarm]

added edit to ^^ about filters and making them into evap cooling. Again, check McMaster.

Just read your portable cool link. Along that line see those from one of my go-to companies Global Industrial Products Link should put you in the right area.

[philipma1957]

Note I will check filtering mentioned here we need some  as  we get bugs in the gear at times.
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3 layer system and a rack for the gear


this is the rack I have 2 side by side

https://www.target.com/p/adjustable-3-tier-wide-wire-shelving-chrome-room-essentials-153/-/A-17136152?lnk=rec|slp|search_bought|slp|17136152|5




first layer is used in car engine components.  it wraps around the racks and directs air to a pair of gable fans

https://www.amazon.com/Car-Insulation-Deadener-Automotive-Lightweight/dp/B016QUS1YE/ref=sr_1_1?


second layer light duty  reflects heat
https://www.amazon.com/Reflectix-BP48050-48-Inch-Bubble-Pack-Insulation/dp/B0002YPIOW/ref=sr_1_fkmr0_2?

third layer

reflects heat and in our case prevent roof leaks

https://www.amazon.com/Heavy-Duty-Silver-Tarp-12X20/dp/B0009Q39CQ/ref=sr_1_8?s=hi&ie=UTF8&qid=1504830877












finished product  we can do 13 kwatts with this set up.   I spent  90 + 90 + 30 = 210

  I needed a 20 foot car insulation piece  to wrap around  the 2 racks   6+6+3+3 = 18 ft  fully wrapping the two racks


we have 4 avalon 721/741  4400 watts  we have 4 s-9's 5000 watts 9400 watts 24/7/365


all three layers of insulation  the rack acts as a structure for the car insulation  this makes the loft 10 f lower  then outside temp 100f outside 90 f under the loft and three layers.




only the car insulation  if 100f  summer temp that loft was 105f



two fans from home depot

[BitcoinIntern]

Was browsing through stuff and found this...Scary...

http://gizmodo.com/a-huge-fire-took-out-a-bitcoin-mining-operation-1655981855

[GMPoison]

Was browsing through stuff and found this...Scary...

http://gizmodo.com/a-huge-fire-took-out-a-bitcoin-mining-operation-1655981855

I remember when that happened... never skimp out on your electrician, lol.

[Michael20]

Could it not be a option, to open the miner. So its naked, and put som 120mm fans above it? Yes then you couldn't exhaust the air so easy.

[BitcoinIntern]

Could it not be a option, to open the miner. So its naked, and put som 120mm fans above it? Yes then you couldn't exhaust the air so easy.

That would void the warranty.

[NotFuzzyWarm]

Not to mention would not cool the miner very well at all.... High power in small package = forced air cooling. Period.
Even if opened and the boards splayed out you still need a lot of airflow moving over the heatsinks. Use enough 120mm fans and sure, it is doable but a pretty pointless exercise in my book.

[LamboHT]

I've been also researching the cooling requirements and airflow management for my soon to arrive Antminers.  I've run across a resource that may be helpful.  It's from APC Electric which is, according to their website, the "industry-standard for reliable power and physical IT infrastructure."  

It's a whitepaper on calculating the total cooling requirements for a data center.

http://www.apc.com/us/en/support/resources-tools/white-papers/calculating-total-cooling-requirements-for-data-centers.jsp

The other resource is from a company called Upsite Technologies which is all about optimizing data center cooling.

https://youtu.be/sWinOiYqPSE

You are effectively building a very small data center and you don't have to reinvent the wheel to implement best practices to your own "mini-center".  Obviously you won't spend the kind of money big companies do but you can still take the principles of efficient energy use, airflow management and cooling techniques and creatively fit them to your needs.  Good luck and keep us posted !

[QuintLeo]

APC makes some good gear - they are my VERY long time "go to" supplier for UPS systems - but that whitepaper ASSUMES the use of standard air conditioning, which is an expensive BAD choice for most miners in most of the world.

 It would be better to reference the Yahoo "Chicken Coop" data center design, which is specifically designed for low cost - or take a good look at the Gigabyte "mining shed" design and all of the other "large farm" flow-through air setups, as miners tend to handle warm temps a little better than most traditional server designs.

 Oddly enough, I had a tentative design I'd thought out and done some planning on 2-3 years BEFORE I heard of the Yahoo design - that ended up being somewhat similar but will handle open-rig miners (the Yahoo design DEPENDS on being used with rack-mount cases).