The CoolTank 2.0

About the project.

The project was started in January 2018 on the Bitcoin mining hype with purchasing of a few ASICs from Bitmain. ASICs initially were located in the apartment, but shortly were moved to the heat insulated container with AC connected to industrial electricity in Jebel Ali (MFC). In April 2018 an overheating problem raised and was fixed by airflow management, but in May 2018 it became obvious that serious investments are required into air cooling system. I had to stop mining to October 2018 or find a solution.

Air cooled mining farm

Cooling solution should match the following criteria: inexpensive, reliable, low power consumption, low running costs, not flammable, self regulated and remotely manageable.  
Single phase immersion cooling solution based on mineral oil was rejected because it doesn’t match all mentioned criteria, i.e its flammable, requires tap water, facility should supervised during hot days (as oil can be physically heated up to 230C). 
2-phase immersion cooling solution matched all criteria and looked more reliable due to the passive cooling process (liquid-> heating -> evaporation-> natural vapor cooling-> liquid). This liquid (NOVEC 1230) normally used in fire suppression systems as fire fighting agent. 

Triple heat exchange process
3D model

Googling discovered that 3M as dielectric fluid supplier and Allied Control as technology provider together developed a product I was looking for – DataTank

DataTank

However this product wasn’t not available for sale because Bitfury Group acquired Allied Control for $200M in 2015 and focused new subsidiary on in-house projects. 
Technically the process looked more or less clear and I started to build my own CoolTank in July 2018. I placed service / purchasing orders in Russia, China, Germany and United States. Everything was delivered to Dubai in January 2019. 

45 hashing boards without heatsinks from Bitmain’s Antminer S9

The prototype on the CoolTank was put into operation in March 2019 and still running. 

Prototype in operation

Since that moment I had no maintenance, no failures, no problems.
General parameters of the CoolTank:

ASIC S9 Bitmain 13.5Th

Hashing boards 45 pcs.

Overclock +40%

Mining power294 Th

Electricity 30 kW

Cooling 3 kW (pump, fan, AC)

Controls / safety / monitoring temperature via Blynk IOT, WebCam, emergency shutdown by signal from liquid level sensor.

Axial fan on dry coolier

Temperature sensor controls fan speed via Frequency converter.

Project vision.
Next step is to implement experience of designing, building, testing and using into a formal “lessons learnt” document.
The CoolTank 2.0 will be available for small scale mining (garage use).

Minimum requirements:

>Manufacturing cost reduction>

Plug&play

>Tank on wheels

>Heat insulation

>Flexible dimensions

>Cable management

>Upgradable

>Hot water utilization

Having done CoolTank 2.0 we’ll be able to provide a range of models for different clients: mining at small and large scale, HPC custom solutions for data centers.

Cryptocurrency mining is just one possible use case on the CoolTank and its 2-phase immersion cooling technology. Artificial intelligence development and implementation will provide a huge demand for cost effective HPC cooling solutions like the CoolTank.

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