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Author Topic: Why not to use AC with Bitcoin Mining?  (Read 3211 times)
toptek
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December 23, 2016, 01:03:42 AM
 #41

I've seen several people mention that using AC is not a good choice for Miner cooling, could someone explain why? (Don't worry, my current mining rig uses fans)

THe cost for some it is nice to use if you want the cost of using it unless you mean some kind of AC on the miners that may not be good i read some place because of how bad that might turn out due to how AC works but using AC in a AC controlled room if you can afford to might be the best way but it cost to much .
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takagari
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December 25, 2016, 12:45:55 AM
 #42

It comes down to power/cost

Regardless of what you think are cheap methods to cool.
For pure power, it costs about as much to heat the air From Temp Y to X as it would to then cool it from X back to Y.

There are cheaper options for cooling, if you have a cold source of water. etc. But generally it's not feasible without free power.

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December 25, 2016, 05:16:03 PM
 #43

It comes down to power/cost

Regardless of what you think are cheap methods to cool.
For pure power, it costs about as much to heat the air From Temp Y to X as it would to then cool it from X back to Y.

There are cheaper options for cooling, if you have a cold source of water. etc. But generally it's not feasible without free power.

The most cost efficient way to cool miners is to directly connect the chips to a cold metal surface that would act as a radiator, and then use a big, low rpm fan to cool it. Multiple small fans make a lot of noise and consume a lot of power. And yes, you can efficiently do it without free power, you just have to live in cold climate. Think about the profits of heating your home with miners. I live in a house with a coal boiler and it burns close to 3t of coal every winter. That's over 600USD per winter. If I wanted to heat the house with natural gas it would cost me twice that.


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notlist3d
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December 26, 2016, 09:53:49 PM
 #44

It comes down to power/cost

Regardless of what you think are cheap methods to cool.
For pure power, it costs about as much to heat the air From Temp Y to X as it would to then cool it from X back to Y.

There are cheaper options for cooling, if you have a cold source of water. etc. But generally it's not feasible without free power.

Also depends on location evaporation cooling is great for some.  But for someone like me it does not work in my location due to climate.   I used high RPM fan's to push heat from miner's and a commercial grade exhaust as standard attic exhust did not cut it for the amount of gear I was mining.   Here is my old thread about dealing with summer for me - https://bitcointalk.org/index.php?topic=1020826.0

And I used winter air in winter... as free and cold where I am so was great.  Summers were all about fan's for me.   AC just is expensive I could have never justified it with my bitcoin the more I expanded. 
jstew
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December 27, 2016, 09:11:55 PM
 #45

A typical AC works in the same way, it just uses much cooler pipes and radiators around them to increase the surface.
If the room temperature is for instance 30*C, the water from an outside source will be at least 10*C cooler. Passing air that is at 30* around the pipes that are at 20* will make it cooler, no doubt about it.
Similar technology is used in evaporative coolers, but they might not be suitable for mining because they increase humidity.


i use evap coolers at my data center , the manner in which i have my racks arranged allow me to use 2x 6k cfm evaps to keep everything nice and cool in 100* ambient temps , and most of the time i do not need to run them on high speed , my coolers both have 2 speed motors which on high are 3/4 hp and low speed is 1/2 hp . 1hp = 745w. so they are very cheap to run.

evaps only work if ur average humidity were u are stays below 20% , in my area avg humidity is about 5% so they work extremely well. this higher ur humidity is on average in ur area the less effective the evap coolers get



the way my racks are setup i could actually remove the fans from my miners and the evaps would force the cool air threw the miner , i leave the fans on though
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