ColdLogik rear door cooling

ColdLogik rear door coolers provide unprecedented cooling capacity and efficiency for data centers. For facility managers and engineers seeking to address higher densities and lower energy spending, ColdLogik can lead to results such as lower PUE, savings on cooling costs and greater facility energy efficiency.

ColdLogik rear door coolers

ColdLogik is a data center cooling solution utilizing rear door units, also known as rear door heat exchangers (RDHx) or rear door coolers (RDC). This sophisticated and precise iteration of rear door technology efficiently meets the growing cooling demands of data centers.

Unlike CRAC units, which rely on airflow methods to guide chilled air to cabinets, ColdLogik units are outfitted directly on the cabinets and cool the hot exhaust air produced by the equipment — essentially turning the cabinet itself into a containment device. Air from the cooler overwhelms the warm air leaving the adjacent cabinets, and the resulting air mix provides the predetermined room temperature. With heat removal occurring so close to the heat source, greater efficiency is achieved. The cooling units also intelligently adjust operational parameters in responses to heat removal demands, eliminating hotspots and maintaining equilibrium in the most efficient manner.

This cooling solution offers key benefits for data center managers seeking an advanced cooling system:

High density capability.

Up to 135 kW, to be exact. ColdLogik can handle the high density demands of GPUs, video processing, analytics and more.

Unrivaled PUE.

ColdLogik has reached an independently tested PUE figure of 1.045.

Significant energy savings.

The intelligent management system allows ColdLogik to operate at a high efficiency, expending less energy and achieving up to 98% energy savings compared to CRACs.

Reduced CAPex.

Installing a ColdLogik solution doesn’t require aisle containment or raised flooring, lowering capital expenses for greenfield deployment.

Rapid ROI.

Data center managers who install ColdLogik see significant savings in their cooling costs in 10 to 18 months.

Hot spot elimination.

Temperature probes on each door detect hot spots, inciting a deployment of cold air directly to the hot spot in a more precise manner.

Free cooling potential.

ColdLogik units can operate with higher water supply temperatures — up to 75oF — which ensures operation above dew point and thus no condensation. This also opens the possibility for free cooling and potentially negates the need for traditional mechanical cooling products such as chillers.

Scalable design.

Despite their high density capabilities, ColdLogik rear door coolers aren’t just for high density facilities. Facility managers can deploy units every third or fourth cabinet for lower kW cabinets and incrementally add more doors as capacity increases. Click here for examples of low, medium and high duty deployment.

Guaranteed leak prevention.

The sophisticated, patented Leak Prevention System (an optional addition) pulls air into the system (instead of water escaping) in the case of a breach, ensuring equipment remains protected.

The sophisticated, patented Leak Prevention System (an optional addition) pulls air into the system (instead of water escaping) in the case of a breach, ensuring equipment remains protected.

How the units and CMS work

The ColdLogik unit pulls ambient air into the cabinet via active equipment fans. The hot exhaust air then passes over a heat exchanger matrix; in passive models (which are used for lower densities) the equipment fans produce enough air volume to in effect “self-cool,” while active models utilize EC centrifugal fans mounted within the door. The heat is then transferred and rejected to coolant and the resulting chilled air passes back into the room at the predetermined ambient air temperature.

The CMS intelligently operates the cooling network and facilitates overall system efficiency. Essentially, the CMS ensures that individual units don’t unnecessarily deploy cold air and over- or under-cool the room; each unit only puts out as much chilled air as needed to achieve the set temperature. The CMS automatically adjusts fan speed, water flow rate and, if necessary, output water temperature from the cooling medium in response to the heat removal demands placed on the system. This results in the consistent delivery of cooled air into the computer room — with no operator intervention.

How the RMS work

The RMS provides facility managers with a holistic view of the ColdLogik network. This is an optional ColdLogik component and is typically used when over 50 doors are deployed (as opposed to a facility using a smaller number of doors to simply spot cool). The RMS aggregates all network data in one password-protected location and can be viewed remotely and locally for full access and control. Facility managers can access the RMS port from any PC or tablet with Internet to monitor conditions on the ColdLogik CMS — offering greater visibility into the data center’s cooling system.

How the LPS works

The LPS is also an optional component of the ColdLogik system. More than merely detecting leaks, the system actually prevents leaks from occurring. It accomplishes this by enabling the flow and return water supply within the data center — including all pipe work, hoses and rear door coolers — to be put on a negative water circuit. If a breach in the water circuit does occur, air is drawn into the system and then vented out of the system. This raises the alarm on the RMS — all without any water ever escaping. The LPS provides facility managers with additional protection for their equipment under the ColdLogik system and greater peace of mind for their cooling operation.

Data center managers can install ColdLogik in a variety of facility sizes and types — this solution goes beyond simply deploying only in high density data centers. In new-build facilities, engineers can design the room with the ColdLogik system in mind — negating the use (and capital expense) of raised flooring, containment aisles or space-consuming CRAC units. ColdLogik rear door coolers can also be retrofitted onto existing cabinets at legacy data centers at varying frequencies, depending on the kW range of the cabinets. For example, units can be installed on every third or fourth cabinet for up to 5 kW densities, while cabinets with over 12 kW densities can utilize a unit on every cabinet. The units are fixed onto the existing cabinets with an easily installed interface frame. The doors then open and close the same as before, allowing continued access to servers for maintenance.

To install ColdLogik doors, facility managers will need to ensure the water mainline is accessible within the computer room — this allows the hoses from the ColdLogik units to access the chilled water necessary for cooling. This can be done with a mechanical engineering team, with insight from the Sealco team on what connections will be necessary. Once the mechanical engineering team has prepared the room with accessible mainlines and hose connections, the installation can begin. The individual doors themselves only take about 10 to 20 minutes to install, with the entire process ranging from less than a day to up to a week (depending on the size of your deployment).

Facility managers should note that to employ ColdLogik rear rack door cooling, your facility should operate on water-based cooling (and not refrigerant-based cooling). You could ostensibly switch your system over, but the cost of switching your entire data center’s cooling base would likely not justify it.

ColdLogik units come in varying sizes to match the density needs of your facility:

ColdLogik unit type Heights available Width available Passive/active kW maximum CMS
CL20 C4 2 heights 3 widths Both 20 kW Yes on active
CL20 C8 2 heights 3 widths Active 35 kW Yes
CL20 C12 2 heights 3 widths Active 45 kW Yes
CL20 C14 2 heights 3 widths Active 58 kW Yes
CL20 C12 PLUS Details coming Details coming Details coming Details coming Details coming
CL20 C14 PLUS Details coming Details coming Active 85 kW Yes

ColdLogik in action

Once your ColdLogik system is up and running, you’ll see an immediate drop off in hot spots, with improvements to energy savings and PUE in 10 to 18 months. You may see results such as:

  • A STIHL data center achieved 90% savings on cooling and Tier 3 (N+1) redundancy with a rear door cooling solution. See the full case study.
  • A Cambridge University facility achieved 98% power efficiency with a rear door cooling solution. See the full case study.
  • An ARM data center achieved a PUE of 1.045 demonstrated on full load with a rear door cooling solution. See the full case study.

See how ColdLogik can improve your facility’s cooling

ColdLogik leads to significant improvements for data center managers seeking a more efficient way to cool. See how ColdLogik can fit into your facility’s system by talking with a Sealco representative. Our data center experts will analyze your current configuration and offer a best-fit ColdLogik solution for your computer room. Start improving your cooling today.

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