Determining the required properties of a submersion cooler system

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SUMMARY

This discussion focuses on selecting an appropriate radiator for a submersion cooling system designed for Antminer S9 units and their APW3 power supplies, submerged in mineral oil. The system requires a radiator made of aluminum with forced ventilation and a pump for continuous oil circulation. Key calculations involve determining the temperature of the oil exiting the cooling system, the flow rate of the oil, and the maximum temperature of the air entering the radiator. Participants are encouraged to consult radiator catalogs, such as those from Willow's Radiator, for specifications relevant to their design.

PREREQUISITES
  • Understanding of thermal conductivity and specific heat, particularly for mineral oil.
  • Knowledge of fluid dynamics, specifically flow rate calculations.
  • Familiarity with radiator design and specifications, especially for submersion cooling systems.
  • Experience with iterative design processes in engineering projects.
NEXT STEPS
  • Research the thermal properties of mineral oil and its implications for cooling efficiency.
  • Learn how to calculate flow rates and temperature differentials in cooling systems.
  • Explore radiator design options and specifications from manufacturers like Willow's Radiator.
  • Investigate the design and implementation of forced ventilation systems for enhanced cooling performance.
USEFUL FOR

This discussion is beneficial for engineers and designers involved in cooling system design, particularly those working with cryptocurrency mining hardware and submersion cooling technologies.

orris
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TL;DR
I require assistance in selecting a suitable radiator for a submersion cooing system
Summary: I require assistance in selecting a suitable radiator for a submersion cooing system

Hello,

I am designing a series of chassis's and cooling rigs that will house ant miner s-9 units along side their apw3 power supplies flooded with mineral oil within the housing.
Each unit will consist of a steel pipe 28'' in length with an I.D of 6 in \ approx 6.35 in reality \yielding roughly 792/in^3 for aprox 3.5gal of mineral oil
witch has a specific heat of 1.67kj/kgK not much different than air but i need to use a liquid that is thermally conductive but not electrically conductive as the units will be submerged. Between the mining unit and the powersupply each rig need to dissipate roughly 3.5kw
I am having a very interesting time trying to find a formula to size my radiator selection .
The radiator should be an all aluminum affair with fan on one side providing forced ventilation,Aswell as a small pump to keep the oil continuously circulating.

Any assistance would be appreciated
 
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You need to find the following:
Temperature of oil on the hot side where it comes out of what you are cooling.
One of the following (note that you calculate one from the other):
Temperature of oil leaving the cooler
OR
Flow rate of oil
What is the maximum temperature of the air into the radiator?
The leaving temperature of the air is calculated from the air flow rate, or vice versa.
With all of the above information, you are ready to start studying radiator catalogs.

Here is one source of radiators: http://www.willowsra.com/new_cuts/Water%20Coils/WSD_Coils.pdf. They are not exactly what you are looking for, but will give you some idea of what information is available. You would need to interpolate for your temperatures, and adjust for oil instead of water. I have one of their 18X20 coils heating my shop, and their specifications seem to be accurate.

Have fun, because the design process is iterative.