Avalon 7/8 Cooling

[caxibrema]

Does anyone have thoughts on how to cool a avalon 7/8?

For the bitmain antminers I've been using Fan duct shrouds https://www.ebay.com/itm/BITMAIN-Antminer-S7-S9-D3-L3-Fan-Duct-Cooling-Shroud-4-Inch-Vent-US-SELLER/272986906657 + vent tubes https://www.homedepot.com/p/Everbilt-4-in-x-8-ft-Louvered-Dryer-Vent-Kit-TD48PVKHD6/203626525 and they are been working quite well

[fanatic26]

You cool them by exchanging fresh air in the room. Ducting just adds its own set of problems because most people dont understand how to size it properly so as to not restrict the miners natural cooling ability.

Do some research on how to setup hot/cold isles to properly manage heat.

[caxibrema]

You cool them by exchanging fresh air in the room. Ducting just adds its own set of problems because most people dont understand how to size it properly so as to not restrict the miners natural cooling ability.

Do you mind sharing the common problems with ducting? I might be making those mistakes.

Do some research on how to setup hot/cold isles to properly manage heat.

I saw something in m/video/2018/01/11/inside-a-bitcoin-mine.html that might be what you are talking about.

[fanatic26]

Do you mind sharing the common problems with ducting? I might be making those mistakes.

Most people dont size the duct properly for the airflow needed or they do not take into account the length of the duct. Think about it in terms of car exhaust. You have to balance the backpressure properly or the system will suffer. That is why you cant run an engine without headers, nor will it run properly with an exhaust that is sized too small, there is a balance that needs to be achieved. Also people will use inline fans that are not cfm matched to the amount of flow you are trying to create or they wont have enough fresh air in the room to pull through the machines. There are a number of factors that need to be taken into account.

[caxibrema]

Most people dont size the duct properly for the airflow needed or they do not take into account the length of the duct. Think about it in terms of car exhaust.

Mind giving some concrete numbers? For the antminer s9 for instance, is 8 feet too long?

Also people will use inline fans that are not cfm matched to the amount of flow you are trying to create

It seems the s9 for instance its around 200m³/hr which translates to around 120ft³/min or CFM. Would people generally assume linear growth? e.g. 10 miners ==> 10 * 120 = 1200 CFM?

[Raymond_B]

Most people dont size the duct properly for the airflow needed or they do not take into account the length of the duct. Think about it in terms of car exhaust.

Mind giving some concrete numbers? For the antminer s9 for instance, is 8 feet too long?

Also people will use inline fans that are not cfm matched to the amount of flow you are trying to create

It seems the s9 for instance its around 200m³/hr which translates to around 120ft³/min or CFM. Would people generally assume linear growth? e.g. 10 miners ==> 10 * 120 = 1200 CFM?

Just did a quick write up

https://bitcointalk.org/index.php?topic=2796117.msg28582363#msg28582363