3 min read

New model of ColdLogik Smart Passive Rear Door Cooler: Now available

USystems released a new version of ColdLogik Smart Passive Rear Door Cooler (RDC), the CL21 Smart Passive RDC, a self-cooling passive RDC with an upgrade system to a proactively cooled RDC.

The Features:

  1. Universal rack compatibility
  2. Retrofit capable
  3. Simple installation
  4. Air pressure drops fully disclosed to ensure compatibility with in rack equipment prior to deployment
  5. Pay as you grow for definable kW ratings if upgrade path is needed
  6. Less wastage through upgrade path – no need to replace the existing system
  7. Feature packed ‘ColdLogik management system’ available on active upgrade
  8. New axial fan design on upgrade path
  9. Best in class energy usage at industry typical densities, when compared to other active systems
  10. Integrated interface frame for the most shallow RDC USystems has ever produced

Carefully designed and tested, the new version of Smart Passive RDC is expected to enable better transition from traditional cooling methods into a much more energy efficient overall solution.

The CL21 was designed, from the ground up, to be the best possible solution in the industry for racks with a cooling requirement between 0-29kW. The CL21 facilitates significantly better energy efficiency, waste free upgrade paths, all whilst reducing the footprint required within the whitespace and the carbon footprint for the environment.

‘The CL21 is the next step in our journey towards helping our customers improve their efficiency of energy and space alongside their on site sustainability. As with any of our products it was born through multiple customers requirements and feedback has been taken by the team throughout the process to optimise design.

As a result of this I am sure you will see subtle differences in the CL21 to the rest of the product range. However in our push to improve our offering it will certainly not be our last product to see some change.

‘Working with our customers to facilitate their requirements is right at the very core of USystems DNA and the CL21 shows our continuing commitment to this.’

-Sam Allen, VP Tech Sales

Challenges and Solutions


Bulk faced the following challenges:

  • How to design a solution for a colocation customer when specific IT technology, density or rack configuration is not known.
  • How to cater for the current GPU trend requiring 40-50kW+ per rack, while also considering future tech upgrades that could scale to even higher densities including Direct Liquid Cooling (DLC).
  • Find a flexible solution that allows its customer the option to select and bring in their own racks of different sizes and manufacturers.
  • Maximise operational efficiency through optimised airflow and heat rejection.
  • Reduce time for white space fit out and customer deployment by pre-installing and testing all cooling components.


The ColdLogik solution:

  • Energy Efficiency Ratio (EER) of over 100 at maximum capacity.
  • Average 15% reclaimed power for Compute by comparison to traditional cooling.
  • Potential Cooling PUE available of 1.035 with RDC.
  • Over 50,000 trees worth of carbon saved per 1MW ColdLogik deployment.
  • Adaptive Intelligence that controls the whole room temperature.
  • Higher water temperatures reduce the need for mechanical cooling, whilst maintaining ASHRAE A1 temperatures.


Data Center Products 

that Exceed Expectations

Discover the High Performing Data Center products, including ColdLogik Rear Door Coolers – RDHx, ColdLogik InRow Cooler, ColdLogik & EDGE LX Plant.
Rear Door Heat Exchanger

CL21 Passive Rear Door Heat Exchanger

The CL21 Passive RDHx offers high-performance cooling at zero-operational cost.

ColdLogik CDU

Efficiency, reliability, and innovation define our CDU.
Server Cabinet

USpace - 4210 Cabinet

Cost-effective and versatile Rack, adapts to diverse applications, offering ease and flexibility.
InRow Coolers

CL80 600W InRow Cooler

Precision cooling solutions for aisle containment, ensuring optimal performance.
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Server Cabinet

USpace - 5210 Cabinet

High-density design with flexible configuration for evolving IT environments.
InRow Coolers

CL80 300W InRow Cooler

The highest cooling capacity available in a footprint of a chilled water InRow.


Data Center Solutions
that Exceed Expectations

Get in touch with us at USystems Ltd to join the journey towards more efficient and sustainable data centers. Our leading and innovative technologies are designed to help you use less energy and reduce your carbon footprint on a global scale. Contact us now to explore how we can work together for a greener future.
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