Agreed. I'm running roughly the same but using a single exhaust fan with a max of 3560 CFM. http://www.airkinglimited.com/page/window-fan.html

It's doing a great job so far. Will prob have to add a second soon as I add more miners.
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Wow thats really low. I am guessing it is because u have 10 degrees outside. Mine is 25-32, no seasons, juz permanently that temp.

I am using 18kw out if my 20kw at the moment. Also my layout is such that I point the machine hot air at the exhaust fan . I believe that helps. There is a good amount of space behind the miner for thr hot air to occupy but the airflow is strong and it gets sucked out quickly anyways. Since u have almost twice as much watts, maybe 11000cmh could be enough. I believe it depends on layout too. More is better and safer I guess. Also, good air pressure is important to pull the air into the ducts.

The bigger issue is how mining difficulty is going up too fast these days though sigh.

Dude, there is no correlation. Tbat is just u thinking someone is looking out for u lol.

More miners = higher difficulty
Price has nothing to do with difficulty

And yes, while people are less likely to order when it is not profitable, bare in mind that miners are ordered 2-3 months in advance, no one calculates the total difficulty that all the miners will create, and the media sensationalizes mining which makes people juz buy...
So, more manufacturers means that every month, there are much more machines going online than when there were less manufacturers. And currently, it is already rising too fast.
Many D3 miners will probably never break even....

Lets hope samsung re-evaluates the market and backs off.

Not good. It seems the asic manufacturers are going to war? Bitmain will win but at wat cosr to miners. Reminds me of how OPEC increased production to kill off shale oil producers. OPEC made far lesser money then and shale oil producers lost alot. I guess this will be the case for samsung. Mining profit will be really low though, unfortunately. Juz a 6 gpu rig makes alot more than any asic now lol. That is ridiculous considering asic is so much easier to handle.

I see but isnt it better to just put the intake fan to exhaust?

At first, I wanted alot of fan power (based on wat I read on the net and some calculations) but the engineer recommended me about 5000 cmh and I end up putting about 5500 CMH only. I can control the fan speed via a controller but I just leave it on near full power. I only lower the fan for a couple of seconds when I change air filter paper. If I buy an additional slide-in panel for the filter, I can probably change it by juz changing the whole panels and not the filter paper. I wouldnt need the fan speed controller then lol and can juz leave it at full power. I dont use any sensors, juz a simple fan speed controller, something like this http://img.directindustry.com/images_di/photo-mg/5369-9723484.jpg  . I skip using those expensive variable speed drives....dont need it lol.
 
My area is about 24-32 degrees and weirdly, I can get around 30 degrees inside when outside is 32 degrees but this is on the cold side of the miners. I never measured the hot side as the air is bound to be hot. More importantly, there is only 1 row of shelves and all the hot air goes into a sort of collection area and is immediately thrown out by the fan.


I wonder if 18,000 cmh is overkill. Anyways, more airflow cant be wrong. Bare in mind, 18,000cmh is huge, and so if any water gets pulled in the intake duct, it is going to pull the water quite alot in the direction of air flow. Also, the exhaust fan may push the air outside quite strongly for a few meters. Do note, u dont want trees receiving that warm exhaust air as they will probably die. U should check how far forward the air will be pushed out and if that will affect other stuff. Also, make sure the exhaust hot air cannot come back in if the wind changes direction. For my setup, the middle to bottom portion of the room has little more airflow and thus, is abit cooler to put all my miners there, rather than on top portion.

Your antminers will be far louder than your fans. There are far cheaper fans on amazon also. I used an expensive box fan due to the need to fix it with ducting, a fan speed controller and I also rig it to off the distribution box if it were to malfunction.

How many CMH of fans is the exhaust fan? By right, if u push air outside, air will automatically come in, u dont need an intake fan.
The centre fan helps cool the miners? What temps u have outside and wat are your antminer temps?

For my setup, the middle to bottom area has more air flow and is abit cooler to put machines there then right at the top. So, I place all my asics there lol

This is not good. Difficulty going up and more manufacturers joining the asic party as it is. Bitcoin price is now consolidating/stagnating. To make matters worst, news sources keep saying mining is great.
Hope those new manufacturers think about it and dont join the asic party as we dont need more difficulty....

Unfortunately there is alot of sensational news on mining for all coins,  not just btc and ltc. No miner will win if difficulty is too high. Everyone will juz mine even if it makes a couple of bucks a month. Many newbies wont break even.

I hope our dear bitmain finds some kinda cooperative legal solution with their competitors

Yep, spot.on. it will be like the D3 or thd obelisk miner which will have a very hard time ROI now.
Obelisk miner will probably never roi. Kodak also gave a ridiculous proposal for mining that puts them in profit and users in likely losses.
Samsug is a huge company and this is juz small business for them.


And that is why it is actually a good thing that we dont have more manufacturers. The most profitable mining time would have beem when bitmain had a monopoly.

More mabufacturers means more machines and since there is a fixed amount of new bitcoin that can be mined every 10mins, that means less profit per miner.

In general, miners are bought 2-3 months in advance. This makes things worst. People will see the profitability as low but somewhat decent and order. By the time the order reaches them, the profit is lower due to difficulty increases. This is made worst when many manufacturers deliver at the same time.... The media will irresponsibly sensationalize mining because they need something to write.

This is not like a normal product where more competition means cheaper prices for consumers and so competition means consumers win. There is a limited amount of coins released every time period that can be earned by evrryone...

U got this idea from reading the news?
Have u done your preparation for the mining location, profitability calculations, etc?

I see.

This is a very ridiculous thing to say.

Of course higher bitcoin prices = higher profits but u gotta be freaking retarded to assume that bitcoin price will rise 10 times this year juz because it did so last year. Past performance does not indicate future performance, period...

And if by some miracle that happens, it would be much more profitable to juz buy and hold bitcoin rather than put money into mining equipment.

Dude, there is NO CORRELATION between price and difficulty period lol. Price got pumped last year due to hype and good news from media. That seems to have died down for now.

If there is a correlation, dash price needs to be 2-3 times higher than it is now due to the difficulty's phenominal rise. Antminer D3 will then make some significant profit instead of wat it is doing now.
Bitmain isnt dumb either. They diversify to AI chips as well, not juz mining.

U gotta be nuts if u think btc can rise 10 times a year. That would make its mkt cap over 2trillion plus this year and 20 trillion next year...thats juz impossible and it will actually be posing a significant risk to financial system in just few years from now.

I hope u are right buddy

My post makes alot of sense. I think u just dislike bitmain too much.

Dude, last year, Bitcoin price went up from 800 usd to 20,000 usd to now about 10k+ usd. That is a price increase of 12-20x or so.
Did mining get 12-20x MORE profitable?
No, it didnt.
Why?
Because bitmain and other manufacturers push out so much equipment to push difficulty far far higher....

Now, wat do u think will happen when more manufacturers add to even MORE mining equipment and BIGGER difficulty increase??
Bitcoin price will need to go up 12-20x again...same as last year... to keep mining profitability sort of the same.

I dont see bitcoin rising to 120,000- 200,000 usd this year. It has stagnated for a month as it is.......
We can have a case where mining does not make money but selling miners makes money.

I did mine with around 20kw. I am not sure what i am looking at exactly in your drawing.

I hope u realize that the sound will be VERY LOUD. U can hear it even 15-20 meters away.


Tips:
Shelves - use good shelves shelves that can take over 100kg, not those ikea shelves with 32-40kg max load weight.
Your air intake and exhaust - MAKE SURE the exhaust HOT air does not recirculate into the AIR INTAKE in any situation. Meaning the hot air that goes out does not get to back into the intake if the wind blows a certain way. Account for the fact that wind changes and put a good margin of safety on this.

Airflow - U dont need air intake. As long as the room is sealed and air is pushed outside the room, air will automatically enter the room through any opening. The amount it pushes air out depends on the pascal air pressure in the room. Mine is around 200 pascal via box fan, something like page 280 here http://rosenberg.com.sg/wp-content/uploads/2015/04/worldoffans_en-2.pdf . U can use any sort of fan though. In general, dont take air in from ground as the air is abit more dusty and since warm air rises, it is abit better to put air out-take/exhaust fan at higher point or at least middle.
Also six 0.1m2 holes is about 0.6m2 total. That may be too much. Your air pressure pascal might be too low. U may wanna get an engineer to calculate or perhaps start with smaller holes and widen them slowly.

Air dust filter - This is important but do note that it will slow down the air flow coming in a little depending on wat air filter type u put, be it G3/G4/etc filter.

Rain and air intake area - This is important. Since u have ALOT of airflow going in and out of your small room, u gotta make sure the air intake does not pull in water as well. I suggest having the direction of air coming in not point directly at your miners as it may bring some water in. For example, the intake air comes in through a duct that face downward to the ground, making the air come in facing downwards. This way, if any water droplets gets pulled in, it will drop to the floor. I suggest leave some distance between air intake and shelves. Same with exhaust, u may need to push the air through a fan through a duct due to rain, depends on situation.

If u have the space and it is economical enough, u may want to split it into 3-4 exhaust fans rather than 2, so that if one fails, u still have 2-3 working. Alternatively, u may wanna try get an electrician to use control circuitry with your box fans (if your box fan has that function), to wire it to the distribution box such that if the box fan fails, it shuts off the power at distribution box. This is because if box fan fails, your machines will overheat and the miner goes into overheat protection mode which works fine but I juz rather avoid. However, not all electricians know how to do this, juz fyi. May cost abit also.


Electrical -
Best to use power factor of 0.8 - 0.85.
Since it is on 24/7, this is continuous load, do not put more than 80% load on a breaker. Meaning if it is 20amp breaker, put at most 16 amp on it. Same with each socket, best to put more sockets and dont overload.
Make sure your wires are all good copper wires that are big enough. U dont want them overheating.
Use good mcb like hager or MK. Dont use cheap china mcb which may cause issues.
I use a surge arrestor for the distribution box to prevent surges. U may want one.

This is insane. There is too much mining difficulty already. This would make mining difficulty rise further...it is plain stupid.
Samsung can make huge losses here.

Anyone have any idea when this will hit the market?

I already have a surge arrestor for my distribution box. Will that also help against ethernet surge issues?

Problem is the grounding of the ethernet surge protector is not that easy and I do worry wat could happen if the grounding socket gets loose and lightning occurs. There is alot of airflow in that room after all.

I cant seem to find an ethernet surge protector in a powerstrip or plug for 220volts. I would prefer that over a ethernet surge that has to connect to a ground connection


Hmm I also read that ethernet surge protectors tend to mess up bandwith network packets. That isnt good as I need it smooth. Is there such a thing as a netwotk switch with stronger built in ethernet surge protection than usual?

How often u guys do it. Once in 2 months?
Mine has air filters installed to remove duat as well.

Does bitmain have an official number?