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Title: Avalon heat rejection management question Post by: ccgllc on March 30, 2018, 04:47:24 PM Hi all. Running a farm of 100+ S9s. Heat rejection for them is easy: Stick the rear fan through your cold/hot aisle wall and the issue is solved (cold air in from the cold aisle, hot air out to the hot aisle). Only downside is the power supply waste heat (7% of what is used, more or less) ends up in the cold aisle.
I have (11) Avalons coming on Monday and I've been trying to figure out an equally elegant cooling solution for them. Alas their power connections are on the back of the machine, so if I played a similar game as I do with the S9s, I'd either need holes in the cold/hot aisle wall for power cables, or would need to put the power supplies in the hot aisle - which just doesn't sound like a good idea (and would involve some other minor redesign issues like moving power from the cold aisle to the hot aisle to avoid having the power cords going through the wall). FWIW - I'll be using Bitmain APW3++ power supplies for the Avalons, mostly because I have an excessive quantity of them. So many in fact that I've considered splitting them, with each power supply driving half of an 841. e.g. P - A - P - A - P... That would at least prevent power cables from crossing the back of the exhaust area of the Avalons. Any thoughts or suggestions? Title: Re: Avalon heat rejection management question Post by: fanatic26 on March 30, 2018, 04:50:30 PM The Avalons have their power and data connector on the front and their fans exhaust out of the back. Unless there is some radical deisgn change I am unaware of that is how they have been produced since the Avalon 4 redesign.
Title: Re: Avalon heat rejection management question Post by: ccgllc on March 30, 2018, 05:35:53 PM Ah... thanks. Bad assumption on my part. That is great news.
The resent BlokForge video at https://www.youtube.com/watch?v=gMZSEV6H-_4 made me question my sanity. Apparently they have the Antminer rejecting heat to the back of their setup and the Avalon rejecting heat forward. They compounded that with their stack showing the relative size. I'll comment more on that in the appropriate thread. Title: Re: Avalon heat rejection management question Post by: DPoS2 on March 30, 2018, 07:34:56 PM Adding some type of fan to the front to give more air on the intake does help with these Avalons and yes it is a challenge because of the wiring but you don't have to be perfect, as long as you are directing more air towards the intake it will help so you could be creative in designing something for each section of your miners or just get small fans that fit between the wires
Title: Re: Avalon heat rejection management question Post by: rifleman74 on March 30, 2018, 07:51:36 PM You could turn those power supplies the other direction if need be and exhaust the heat in the hot aisle. That's how I have mine set up.
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