Crypto currency mining

MikkiJayne · #1 9th February 2018, 07:32 PM

How about quieter fans? Be Quiet! have a pretty good range.

ainarssems · #2 9th February 2018, 11:42 PM

I already have some acoustic ducting, just waiting for adapters, UPS should deliver them on Monday. I was thinking something like this for rpm signal https://www.ebay.co.uk/itm/NE555-Adj...53.m1438.l2649 I don't think it would matter if it's fixed speed, just set it about 4500-5000 rpm( 9-10kHz)

Be Quite fans will be too weak. Their 12cm model is only 50CFM/ 17Pa Static pressure (73CFM/ 33Pa for high speed model). Bitmmain does use several different fans but you are looking at 180 to 200+ CFM and 200-300 Pa static pressure. So this 5 inch model with 180 CFM, 230Pa should be suitable considering that original fan does not run at full speed https://www.airconcentre.co.uk/manro...+fan/912387649

moltuae · #3 10th February 2018, 07:46 AM

Quote:

Originally Posted by ainarssems

I was thinking something like this for rpm signal https://www.ebay.co.uk/itm/NE555-Adj...53.m1438.l2649 I don't think it would matter if it's fixed speed, just set it about 4500-5000 rpm( 9-10kHz)

Certainly simpler and worth trying. It should work as long as the fan control isn't closed-loop. My guess is it won't be but it might flag a fault if it is. Might be best to set the fan speed to 100% before disconnecting the fan, so that it's not trying to adjust it, then set the 555 to output a frequency that matches a 100% fan speed.

moltuae · #4 10th February 2018, 08:33 AM

Quote:

Originally Posted by ainarssems

Be Quite fans will be too weak. Their 12cm model is only 50CFM/ 17Pa Static pressure (73CFM/ 33Pa for high speed model). Bitmmain does use several different fans but you are looking at 180 to 200+ CFM and 200-300 Pa static pressure. So this 5 inch model with 180 CFM, 230Pa should be suitable considering that original fan does not run at full speed https://www.airconcentre.co.uk/manro...+fan/912387649

One potential problem I've just thought of with that extractor fan is the air temperature. According to the spec sheet it has a maximum running temperature of 40 degrees. It might be ok if you can put it far enough downstream and shed some of the heat along the way.

You probably won't need much acoustic ducting if the fan your using is a lot quieter and just 2 or 3 metres reduces noise quite well I find, so you could use some plain metal ducting to allow some of the heat to escape before it hits the fan.

In my cellar, I have 2 L3s that exhaust through about 400mm of acoustic ducting before merging into a single (approx 3 metre) length of acoustic ducting that takes the heat up into the house. At the merge point I've used a metal Y splitter (in reverse). Checking the temperature there I'm getting 60+ degrees C. At the far end, in the house, where I've used plastic ducting adaptors, I'm getting about 50 degrees C and very little noise coming out of the end of the ducting. To get closer to the 40 degrees running temperature of that fan, I suspect you'll need 2 or 3 metres of uninsulated metal ducting in addition to (or instead of) the acoustic ducting.

ainarssems · #5 10th February 2018, 01:47 PM

That Manrose fan I was thinking on using on intake to push fresh air in the miner and hopefully get away without exhaust fan.

Are you using 4 inch or 5 inch ducting? I have bought 4" but now I am thinking I should gave gone 5". As my adapters are still with UPS I got some of these for temporary testing https://www.screwfix.com/p/manrose-s...te-100mm/18561

They are quite restricting and chip temp have gone 80C to 90C and fan from 4500 to 5800 rpm for S9 with 4 feet of ducting on either side of miner. Hopefully the proper adapters will do better. Sound level has gone from 80dB to 70dB inside garage but outside of garage it's pretty much unchanged at around 50dB so it does not really help me neighbours and is a long way from Environment Protection Act of 1997 45dB for daytime and 35dB night time for residential area. I have ordered one of those Manrose fans and signal generator for testing. If it does not work out I might need to give up S9 and D3 and just use L3+ and GPUs.

Also there is no fan settings on these later batch autotune S9s. But there are some people working on custom firmware that will have fand, clock and voltage settings so I might be able to underclock/undervolt S9 and keep it.

Edit:It does seem pretty quite at the end of duct, sound meter still reads about 70dB just like in the free space in garage but putting it next to the side of miner it''s 85dB. I have been offered a non working fridge freezer so will try to cut holes in sides of it for ducts and place the miners inside to see how it goes. Fire safety leaves me a bit worried, need to try and set fire to the inside plastic of fridge and see how fire resistant it is.

Delboy · #6 10th February 2018, 02:45 PM

I see noise is an issue for you guys too. I was surprised how loud the S9 is compared to the l3+

I have ghetto bodged into it packing box with a hole cut either end for ducting but its still too loud.

I'm considering making some sort of sound deadened enclosure for it and its other cousins that are coming.

Not sure how to configure it though.

One big enclosure or a modular setup?

moltuae · #7 10th February 2018, 05:36 PM

Quote:

Originally Posted by ainarssems

That Manrose fan I was thinking on using on intake to push fresh air in the miner and hopefully get away without exhaust fan.

Are you using 4 inch or 5 inch ducting? I have bought 4" but now I am thinking I should gave gone 5". As my adapters are still with UPS I got some of these for temporary testing https://www.screwfix.com/p/manrose-s...te-100mm/18561

They are quite restricting and chip temp have gone 80C to 90C and fan from 4500 to 5800 rpm for S9 with 4 feet of ducting on either side of miner. Hopefully the proper adapters will do better. Sound level has gone from 80dB to 70dB inside garage but outside of garage it's pretty much unchanged at around 50dB so it does not really help me neighbours and is a long way from Environment Protection Act of 1997 45dB for daytime and 35dB night time for residential area. I have ordered one of those Manrose fans and signal generator for testing. If it does not work out I might need to give up S9 and D3 and just use L3+ and GPUs.

Also there is no fan settings on these later batch autotune S9s. But there are some people working on custom firmware that will have fand, clock and voltage settings so I might be able to underclock/undervolt S9 and keep it.

Edit:It does seem pretty quite at the end of duct, sound meter still reads about 70dB just like in the free space in garage but putting it next to the side of miner it''s 85dB. I have been offered a non working fridge freezer so will try to cut holes in sides of it for ducts and place the miners inside to see how it goes. Fire safety leaves me a bit worried, need to try and set fire to the inside plastic of fridge and see how fire resistant it is.

I'm using 4 inch ducting, but only on the exhaust side so far. I did consider 6 inch ducting for parts of the run because I'm merging a couple of them together into one ducting (only the lower-power L3+ miners) but it started getting complicated finding the right adaptors, so I stuck with 4 inch throughout. At roughly 80 degrees, the chip temps are probably slightly higher than they would be without the ducting, but they are getting cool air from the cellar. I'm yet to put an S9 down there. I'm planning to encase them first (probably in MDF painted with fire-proof paint) to make them a bit quieter.

Using the extractor fan to push air through the miner is a good idea but it might not work so well on its own. I think it's likely that some of the cool air might escape out of the various openings instead of passing right through, especially on the D3 and L3+ miners since they have that extra grille above the fans. I suspect that's the main reason they have a front and rear fan. You might get away with a quieter fan on the front though, just to ensure some of the cool air over gets pulled over the ASICs at the front end.

moltuae · #8 10th February 2018, 05:40 PM

I'm thinking this might be the cheapest solution to the noise:

https://www.amazon.co.uk/3M-1100-Foa.../dp/B008MVYL7C

Enough there for the neighbours too

ainarssems · #9 11th February 2018, 07:18 AM

don't think neighbours will be up for it. For me it is not a problem as it is, just don't want to upset neighbours.

Not sure about that EPA noise regulation, I measured middle of the night on the street away from house and it was still 46dB, maybe my meter is wrong

The phone is showing a lot lower readings , way too low and it's not made to be sound meter so I don't trust phone much.

Thinking more about sound insulation I am not too keen about fridge as it's a lot of work and quite messy to cut all those holes in thin sheet metal. I may go back to it but for now I am thinking about other possibilities. Now with the ducts it seems most of the noise comes from the sides of miner. Maybe I could use some 10 or 12" acoustic ducting and put the whole miner in it? Or possibly use something like this:https://www.multifoil-insulation.com...4m+x+1.5m+Roll to wrap the miner.