Topic: Ducting (Read 1182 times)

You'll have problems, each miner is generating ~ 225CFM. So 5 of those are 1125 CFM plus you'll want some extra. If you merge all that airflow you'll need way bigger ducting than 8", and on top of that you're running it 30'.

Don't do it. These things need to be able to breathe and any kind of resitriction is to be avoided whenever possible even when using booster fans. Also beware of using any kind of flexible duct tubing - they have horrible resistance to air flow. Standard rule-of-thumb is that 1ft of flex tube has the same flow resistance as 10ft of solid ducting. Be sure to account for that.

Dear smart people, I'm reworking my rig with a series of ducting, fans, etc. I'm amazed by the differences that subtle changes can make.

I have 5 asic miners in an insulated plywood box about 44" x 44". I'm thinking of running 6" ducts from each of these to lead outside of the box and combining a few of them (all of them?) into an 8" duct with an inline vortex fan. The fan can displace over 750 cfm. I'll then lead the one 8" duct about 30ft out a window or basement wall (will need to drill a hole or modify window...nbd either way). Also, can i step down the 8" to a 6" duct further down the line...maybe 10 feet down the line from the inline fan?

One a side note, I plan on reversing the flow of air from out to in during the winter months and pipe the hot exhaust directly into my hvac ducting to warm my house. I'm already siphoning some of the cold ac air from a nearby duct directly into the asic units...works like a champ!

Any thoughts on these ideas? I know that the math doesn't quite work out, but I can make some quick mods and exhaust 1-3 of the miners directly into my unfinished basement area without much of an issue. As most of you already know, I, fortunately, learned the hard way that offsetting the exhaust by 1 or 2 units eases the load on the others...less hot exhaust to displace=cooler air=cooler boards=less work for fans=less noise=less energy used=saved $.

Sadly, I've almost forgotten about making $, because I'm fascinated by the science of making the system more efficient! Such a fun project.

Thank you for your honest feedback!

 

It looks great. Cant wait to get them. 9 hours is a long time to print. I can see where high volume would be hard to do.

He's using ABS now, here's a few pics of the new material. I had also asked him to reduce the OD slightly to make it easier to fit ducting over it, previously it was a little too tight. He said he thinks your's should go out this weekend. He is a stickler on quality so they take like 9 hours to print! High volume is not his goal

Ok great thanks.

I texted him to make sure they are ABS

Ok I ordered 4.

Yes sir he is, although I have asked him to start using ABS as my M3s deformed the other material. If you do order let me know and I'll double check he uses ABS.

Link https://www.thegeekpub.com/product-category/mining-hardware/antminer-accessories/

Raymond: Is your buddy still printing those 6” shrouds? I could use a couple.

Please refer to the Dew Point description here.
https://en.wikipedia.org/wiki/Dew_point

If your intake air is 100% relative humidity, you only need to raise the air supply temperature about 5C to eliminate condensation formation. If you have the intake and exhaust of all your miners fully isolated, you can add a small fan to return a little of the exhaust air back into the intake plenum to provide the needed intake temperature rise. Really, you should heat the intake air whenever the humidity reaches 90% or whenever the Dew Point / Temperature spread is <5 degrees.

Filters are good. They must either be relatively huge or fan powered. I prefer to use a heavy metal grid to keep bad people and animals out, then a smaller gauge metal grid to stop the big stuff then finally the filter.

I live in one of the most humid northern places, i've never had a problem. I think the humidity can be a risk if the miner is hot and the air is under 0C. I believe condensation can occur because the miner is hot and then water pellets freeze there. So when you turn it back on, it may cause a short circuit.

I by no mean am an expert on this particular subject, but i can say with assurance the big miners do not filter their intake either, it takes too much intake surface area out. And i'm not actually sure removing the humidity is feasible at all in the first place, because all proper setups will vent the heat out. So as you try to remove it, an infinite intake of it will keep getting in.

Extracting heat from air in a closed environment to be able to remove all humidity sound like incredibly expensive hardware and upkeep costs.

Here's the link to the Marketplace thread https://bitcointalksearch.org/topic/antminer-6-to-120mm-duct-adapter-2853173

Link?  I am interested in the 6"

Alright, my friend decided he wanted to sell the shrouds rather than put the file up on Thingverse. For those waiting for the file, sorry I have to respect my friend's wishes

I will post a for sale link in the marketplace

It uses the 4 screws that hold the fan to the body.

Looks like a very good design. I was planning to switch from 4" to 5" but after seeing this will go with 6". How is shroud attached to the fan?

Quick update, went back outside and measured the noise. It's as I thought, no difference between inside and outside DB levels.

To be clear though, the ASICs are only 2.5' or so from the wall so the ducting is very short. Also these are venting in to a 3 sided carport, which turns out to be good as that insulates most of the sound unless you are in direct line of sight of the duct outlet.

So, outside measurements are:

20'  65DB
10' 70DB
1' 79DB

Roughly 40' at my fence-line looking directly at the exhaust outlet 55DB. Going the opposite way, with carport door closed and on the other side in my backyard 20' 45DB. For my location and township I am well within code and no issues with neighbors

I just hit him up, he's going to try to get it uploaded tonight. Sorry for the delay, but he'll do it, eventually

Thank you!!

@caxibrema I will ping him right now.