Topic: Antminer Silencer cooler box? (Read 268 times)

I don't know if you can ever get to quiet. If that's necessary you should reconsider this location or completely change how air is forced through the miners.

You can never be too thin, too rich or have too much airflow. More is better, but there will be diminishing value once airflow exceeds specifications.

Adding a fan adds noise.

If restriction is insignificant, you should not need a booster fan. I did see some folks on this board who tried a 4" duct which resulted in a very hot miner.

I think folks are too hung up on the flange. I just used duct tape.

This is a fun engineering exercise. Just try something, then restudy the physics to make smart adjustments to the design.

Sound energy, like all energy, is transmitted equally in all directions. It's good to absorb this sound energy with a material that is not good at conducting sound waves. Poor heat conductors may not be poor sound conductors. Air is a perfect example of this a very poor heat conductor but excellent sound conductor.

Basically, you need to find a way to absorb sound in every direction from the miner with very little airflow restriction in and out.

Those insulated flexi ducts are surely handy for that. My first attempt was a muffler constructed with cardboard boxes with egg cartons inside. Now days I do whole room systems so these single miner boxes are not something I mess with now. But the same rules apply.

A more ambitious approach could be to replace the fans with a fan designed to be quiet. I gave some thought to using a large squirrel cage type fan that's really a bit overrated for the miner. I'd just directly couple it to the miner input to the blower output. Radial fans like these used on the miners are only okay if you don't care about the noise.

I'd love to hear about what you come up with and how well it works. 

Ok good answer, now the question is if I get say a 6'' antminer shroud and attach it directly to a cooler (intake) and have the other shroud connected to the antminer on one end directly connected to the 6'' insulated duct would that allow the cooler to get air in and out but be very quiet?


I was thinking about buying a fan that does 390 CFM that is 6 inch and attached directly to the intake fan but would it cause problems if say too much air is being forced into the box? What would be better to just have an open 6'' insulated duct laying in my room sucking in air flow or to have the fan pushing the air into it at same time antminer is sucking in the air?



Also, is it better to have the duct directly connected to the box (intake) or directly to antminer (intake) fan?


I've tried styrofoam and it didn't reduce it more than 5 db and that's why I think I need a larger cooler with possibly even foam on the insides?

The larger the pipe diameter the less airflow restriction. A very common error that causes premature failure is not accounting for this restriction If there is a restriction on the intake air supply, there will be a reduction of pressure which will result in less heat transfer to the air. So, same volume of air at a lower pressure can cause some ASICs to run hotter. There is a similar problem on the output except the increased backpressure will reduce the airflow. If you restrict both sides, the flow and pressure are both reduced.

The area of the circle changes by a squared proportion. Recall, Pi x RadiusSquared = area of a circle.
4" duct = 3.14x2"x2 = 12.28 sqin
6" duct = 3.14x3"x3 = 28.26 sqin
8" duct = 3.14x4"x4 = 50.24 sqin

So where 8" duct is 2x the diameter, it is 4X the area.

Airflow resistance is directly proportional to the length of the duct. So, if you double the length of the duct, you double the resistance. This also means you can run 4X the length of duct by doubling the diameter.

It does sound like you need to sacrifice a cooler. I'd probably just get one of those Styrofoam units, cheap and quick to cut, very good insulator.

If you do what you saw on youtube, I expect you'll get a similar result. I saw one or two there; I do think their duct looked too small.

You should look at GPU mining, ASIC miners are loud and hot, there's not much you can do about it with out causing yourself problems...

dont think i can use fiberglass too dangerous where i will have it. Plus why is 8 inch better? I just want my miner very quite at the end of the day and cant have 25 feet of tube everywhere.

4-inch duct is a very bad idea. There is just too much friction restricting the airflow.

Airflow is good, sound is bad.

The good news is that sound travels through air equally in all directions. I just wrap my miner in standard insulation, tie a 6" insulated flexi duct to each fan. I use a long enough piece to make one 360 degree loop so the airflow is the original direction but that's not necessary at all. I don't add any fans as the 6" duct is not very restrictive. If the duct needs to be longer than 4' I'd go with 8", especially on the suction side. 

Too many coolers have given their lives for this cause. A spool of R30 is cheap and right there when you buy the duct. 

 

Alright, so my plan is to buy a cooler, two 6-inch Antminer shrouds, some insulated duct and cut a cooler to have just a few feet of insulated duct running from each end (maybe 3-5 feet on each end tops)

I am in a small room and just have Antminer sitting by a window blowing the hot air out.

My question is do you think if I got a 390 CFM fan https://www.amazon.com/VIVOSUN-Inline-Variable-Controller-Ventilation/dp/B01DXYMJ94?th=1 and attached it to the intake end of the 2-3 feet of insulated duct connecting to the cooler it would be enough to keep the miner cool?


Plus, If I get like 3-4 of the duct coming with the hot air being pointed in the general direction of the window would that be enough? I can't afford to have like 25 feet of this tubing it needs to be really discrete.


I found a similar video to what I'm aiming to do if I buy a cooler https://youtu.be/iS5nqMvcLDo I just don't know if that is as quiet as I possibly can get it? It looks that they just using normal duct vs insulated duct?


 Does insulated duct make the product even quieter? 

Here's where I planned to buy the duct from https://www.homedepot.com/p/Master-Flow-6-in-x-25-ft-Insulated-Flexible-Duct-R6-Silver-Jacket-F6IFD6X300/100396935 it just looks really wide and huge and not sure If I need that?

The other option is to go with 4 inch duct/4 inch shroud but that means I can only get the 190 CPM air fan to cool one end? Would that be enough?


I still don't even know what size/best cooler to buy.


Anyways I'm looking to run my antminer that is about 76 dB and want to make it as quiet as possible so any help is greatly appreciated.