Quote from: Vinncent on April 24, 2019, 01:10:15 PM

Dear community,

Maybe someone of you has an idea what I can do better for the "summer setup" of my small mining farm.

I run the following devices:

7x Antminer T15 - 1541 W each
1x Antminer DR5 - 1800 W
2x Whatsminer D1 - each 2200 W
1x Dayun Zig Z1 + - 1200 W

Total 18,187 watts - plus Switch & Co.

corresponds to
about 19,000 joules
Heat load: 64600 BTU / h
Current consumption: 82.6 amperes

In the winter the miners were standing on top of a storage container. Laterally, a fan Trotec TTV 4500 S has provided airflow. On the back wall of the warehouse were two small tube fans embedded in the wall, which provided some fresh air.

With increasing outside temperatures, the temperature in the hall has also increased dramatically - most recently to 45 degrees. The temperatures of the miners have also increased, PCB partly up to 80 degrees, chips partly up to 95 degrees. That's why I rebuilt as follows:

- Placing the miners in a storage container (about 2 meters wide, 1.80 meters deep, 2 meters high). This center vertically divided with screen printing plate in cold zone behind, warm zone forward. Sawed cutouts for all miners, so that the exhaust air side fits exactly, with sealing tape

- For fresh air down a Helios MV 250 multivent tube fan, with air filter Helios LF 250 and silencer
- For exhaust air above a Helios MV 250 multivent tube fan, with air filter Helios LF 250 and silencer
- after turning on all miners they ran about 10 minutes. Then I closed the roll-up door of the storage container - about 5 minutes later, 50% of all miners went into heat protection mode with 0 T / h power

Now I'm not sure what needs to be changed. Too little fresh air supply? Too little capacity for the exhaust air? Or both? Or too little space in the container? As additional options, I could also leave the container open at the front, and e.g. let the Trotec fan blow into the container, if that brings something.

Maybe you have a good tip? 1000 thanks for your help!

Vinncent

I don't think you are moving enough air to put them inside the container. Your duct looks insufficient for a single unit let alone 11...

It would be nice if you measured the cfm a single unit wants while outside the container, that would give you a rough idea.

You don't have to worry about the ambient temperature too much, as long as you can take that hot air out. Your warehouse is like a box, if you don't move that air the hot air will remain and quickly heat the place (great for winter warming, not so much in summer lol).

So visualize your warehouse as a box, and think a way to move the required number of cfm in and out. If you put your miners inside another box (container), the same applies.

Hot air likes to go up, big extractors above help. And i really mean BIG extractors. But that would pull air from the outside, you must find a way to let that air in, assisted or not...

I think you simply underestimated the amount of CFM each unit needs.