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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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What type of dry coolers or radiators can be used with Engineered Fluids Dielectric Coolants?

Engineered Fluids offers a line of dry coolers that are optimized for use with our Dielectric Coolants. We have done extensive testing on these units and are able to warranty their performance with our coolants. See the data sheet attached to this post for more information about our SLIC Optimized Dry Coolers.

If you wish to use another brand or model of dry cooler in your system, the only special requirement is to ensure that all gaskets and O-rings are made from Viton / FMK or use PTFE. Any standard dry cooler, liquid cooler, or radiator can work, but you will need to calculate the heat load and dissipation based on the manufactures information. You will find all the information required by the dry cooler sizing engineer on our data sheets for each product.

AmpCool Technical Data Sheet
BitCool Technical Data Sheet
ElectroCool Technical Data Sheet
SLIC Dry Coolers – E.pdf


How is the fluid temperature regulated? Dry cooler fan modulation or via a pump controller?

With Single-phase Liquid Immersion Cooling (SLIC) technology, temperature regulation is done by either increasing the amount of cooling surface area, or by increasing the efficiency of the cooler (most often by having thermostatically-controlled fans). Increasing the fluid flowrate helps only if the flowrate is too low to efficiently remove heat from the hot components; once it’s flowing fast enough to do that, then further flowrate increases won’t help.

Increasing the fluid volume won’t help the system run cooler, but it will help the system to be easier to maintain at a steady temperature when there are fluctuations in other parameters. Having too little fluid in a system makes the system less stable and run on a “knife edge”.

Product Warranty


We want to change the way the world cools all electronic devices and help our planet at the same time! We believe that we can reduce the energy demands and increase the performance of any electrical device that generates waste heat (which is all of them!).

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