Brainstorming Mining room cooling - Need advice

[coinbeast]

I will have 5 Antminer S7's and they will already overheat due to the weather warming up here leading up to summer.

I have gone over a few methods of cooling, A/C, evaporative cooling etc. Evaporative cooling scares me because of the water in close proximity issue, drips getting sucked into miners as well as the odd 40C, 104F high humidity day. We get many storms here in summer and sometimes the humidity can get high for a day or two and I am concerned that there will be no cooling factor once that happens.

So this is my current scenario:

A insulated space panel box divided into 2 compartments (chambers on picture)

Outside air will get drawn in through both chambers separately as to draw cool air over the outside of the miners and the PSU's, and to draw the very hot air from the miners out and away from contact with electrical components.

My issue is that the summers get very hot here. Days over 45C, 113F are normal for periods of time, a week or more before a break in the weather.

Without knowing how well the S7 dissipates heat I have just estimated a reasonable amount of heat to be expected. If I could meet these numbers I would consider this a big success.  Obviously I would not want my miners to run above 60C, 140F but for this setup I may very well have to accept up to 70. Hopefully not.

[Meech]

113f for your ambient....sheesh.  Is this in a garage?  The room/garage itself needs to be vented or box fan near your intake.  Otherwise cooling should be sufficient as long as the dead space behind the S7 fans is at least 1 1/2 ft.  Those fans need some space to output hot air.

[philipma1957]

you will need to under clock.  think  4000gh not 4800gh.

 the plus side it you will spend less power and be cooler.

you may be able to use 1 less psu per every 2 miners.

[mazedk]

you really dont wanna run these miners at 45C inlet.. thats hot!

First off, fans will be running mad

second - specs says operating temp is 0-40c

thirs, im pretty sure u'll run into some temp issues with the chips - and prolly wont be good for them longterm

You might wanna add some sort of cold air to the mix when its that hot outside

[davecoin]

Where do you get cheap power with "normal" 113F days?

[MCHouston]

Where do you get cheap power with "normal" 113F days?

A lot of middle eastern countries have very cheap power, as well as parts of South America and Africa.

[MCHouston]

You will probably need some type of cooling or underclocking for this to work.

[coinbeast]

All very good points. Especially about the space for hot air as I haven't account for this. Thanks for you input everyone. I will get back to you sometime today after I have thought about it some more.

[torepia]

How about:



Pro edition:



Seriously tho, it sounds like you could benefit from evaporative cooling? I can't imagine it being worth running AC? Thinking of power consumption.

[Marvell1]

Get a bunch of industrial fans the rolling typecto redirect the air to your man exhaust

For your main exhaust chect Zorro.com or granier forget the spelling for Dayton type exhaust fans

The more cfm the better and they will run you far less in electricity use than ac.

I run a 4000 cfm reversible model 22 inches to exhaust my basement, its reversible so in the winter I flip the switch then it becomes supply.

In your case you probably need a couple of exhust fans and maybe some supply ones to pull air in

4000+ cfm will run you around $500

[alh]

While I think lots of ventilation is a good idea, I think you will still have trouble keeping the miners cool if the air entering the S7 is 45C. I don't think that an S7 will operate with only a 15C rise in temperature (i.e. from 45C to 60C) for the air moving through the machine. If it works, then I am mistaken. I think you only choice in the end will be to try and reduce the total power dissipated by each S7.

[coinbeast]

Thanks for your replies.

I think I need to clarify a bit. My employer provides me free electricity but I would rather not advertise that I am mining Bitcoin with it. So the original drawing takes into account the need for discretion by hiding the miners inside a very heavy sound deadening, insulated box which would be located inside a gutted out, outdoor toilet.

I should also add that the blower I am using is my old ducted air con blower which is rated at 24,000Lt/m or 848cf/m so there will be a load of air pulling over the miners.

I have updated my plan to incorporate some A/C into the mix. The A/C is 2550W which is 42.5% of what would be needed to cool the system alone but I thought that if I set the A/C away from the in supply of air (because I need the hot air from the back of the A/C away from air in) and used ducting to guide the cold air into the 45C air before the miners, I might be able to reduce that down to about 40C or 35C if I am lucky.

Because the volume of air going into the miners is so high, I am not sure of how much of a reduction in temp I can expect. I am aiming to create some decent negative pressure in order to "suck" a fair amount of the cold air into the mix.

[mazedk]

Looks way better imho. Should help you when the heat outside is on and then you can switch it off when its not needed.

[Tupsu]

You have not yet explained why you need the best efficiency factor miners, If your electricity is free of charge.

Is it because of greediness ?

[Meech]

I'm sure most of us have dreamed of hiding these at our work but be cautious in doing so.  A/C directly will contain moisture as I'm sure the nights will where you live which may damage your miners.  So this is outside?  How are you connecting to the internet?

[torepia]

You have not yet explained why you need the best efficiency factor miners, If your electricity is free of charge.

Is it because of greediness ?

This! S5+ is the way to go with free electricity atm, unless you have space issues?

[Tupsu]

You have not yet explained why you need the best efficiency factor miners, If your electricity is free of charge.

Is it because of greediness ?

This! S5+ is the way to go with free electricity atm, unless you have space issues?

No. I think the best way is used S5 . 
65 degrees Celsius is not some kind of a problem for them.  Tested with my Water Cooled S5-half years

[torepia]

You have not yet explained why you need the best efficiency factor miners, If your electricity is free of charge.

Is it because of greediness ?

This! S5+ is the way to go with free electricity atm, unless you have space issues?

No. I think the best way is used S5 . 
65 degrees Celsius is not some kind of a problem for them.  Tested with my Water Cooled S5-half years

You're right! Any miner that gives you the best deal on TH/$, and can operate under those temps should be his choice I guess.
I bet the S5 are more silent as well?

[AriesIV10]

I have many concerns for keeping the S7 cool enough!!!!  I A/C my units right now and they run anywhere from 48-60 degrees Celsius while the required Operating Temperature for the S7 is 0 °C to 40 °C.  How in the world is this going to happen?  Air Volume alone cannot solve this and if you add A/C......there go your profits.

[torepia]

I have many concerns for keeping the S7 cool enough!!!!  I A/C my units right now and they run anywhere from 48-60 degrees Celsius while the required Operating Temperature for the S7 is 0 °C to 40 °C.  How in the world is this going to happen?  Air Volume alone cannot solve this and if you add A/C......there go your profits.

By operating temp I assume they refer to ambient temp/input temp, not the operating temp of the chips.
Can anyone confirm this?

40C ambient is tho..