Dry Coolers

We recommend the use of Dry Coolers for most applications to cool the heated coolant. Dry coolers come in many sizes from 2kW all the way up to 1,000kW. A dry cooler is a large radiator in which the heated coolant is pumped through to dissipate the heat into the surrounding air. Most dry coolers will also have one or more fans mounted on them to ensure proper air flow through the radiators.

The size and type of dry cooler you will need is determined by:

• the size of the heat load you are rejecting (ex. the number of miners x their power usage)
• your physical location (average temperatures and humidity, etc.)
• the vertical difference between the dry coolers and your mining tanks

Dry Coolers fans get an extended life bonus through a major reduction in daily run time.  In most SLIC systems we design we try to target a maximum operational usage of the fans of ~15%.  This not only reduces wear on the fan motors, but also dramatically reduces power consumption.  We are able to accomplish this because the input temperature of the dry coolers (exit temperature of the electronics immersion container) is typically 50C for servers, GPUs, and FPGAs, and 60C for ASIC miners.  This high input temperature to the dry cooler yields an excellent delta in temperature (Delta-T) between the dry cooler’s radiator coils and the ambient air, typically in the 20-30C range.  This extreme Delta T enables us to turn off the fans entirely and still get sufficient cooling of the fluid, except of course during the hottest times of year and day in the hottest locales (think Phoenix, AZ at 3PM in July where the average temperature in direct sun can reach over 45C).  With the excellent Delta-T the dry coolers actually develop their own air flow drawing cooling air into the coils as the heated air rises out of the coils due to natural convection, this action provides sufficient heat transfer to cool the heated Dielectric Cooling by 15-20C.

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