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Ideas for Lower PUE and Energy Usage in your Data Centers!!

Next to Virtualization, improving infrastructure cooling efficiency is the second greatest opportunity to reduce energy costs in the data center. Data centers can be over-cooled by as much as 2.5 times. Since no two data centers are alike, we offer multiple solutions to accommodate cooling efficiency. ROI on cooling solutions can be as little as 12 months. Don’t just super cool the room; you must supply cooling to the equipment load.

By far the most commonly implemented data center cooling strategy today is to orient data center enclosures back to back and front to front. This is done to create aisles of cold air and aisles of hot air. This methodology is simple and inexpensive to implement. As equipment densities increase and power consumption loads approach 4kw per enclosure this design begins to lose its effectiveness. Currently most facilities managers and data centers managers solve this issue by simply adding more cooling capacity to the room by way of adding additional CRAC units. This is CRAC addiction! Simply adding cooling capacity to the data center is most often inefficient and ineffective. The key to making your cooling strategy more efficient and more effective is not just to throw more cooling into the room but rather get the cooling to where it needs to be, to the equipment in the enclosures.

Alternative Data Center Cooling Design Strategies:

Rear Door Heat Exchanger

Cold Aisle Containment:
Cold Aisle Containment takes the Hot Aisle Cold Aisle strategy and adds a containment component to the cold aisle. This design minimizes the mixing of hot and cold air to increase the effectiveness of the CRAC units. This strategy is particularly effective and efficient when blanking panels are used and when loads are greater than 6kw per enclosure.



In Row Cooling with Hot Aisle Containment:
In row cooling with hot aisle containment brings the cooling closer to the load while at the same time contains the hot aisle. This strategy drives cooling efficiencies by bringing cooling units closer to the load and is very effective at per cabinet loads of 6kw and above. Careful planning and design needs to be taken to ensure an efficient and robust in row cooling with hot aisle containment system.



Overhead Supplemental Cooling:
In a strategy employing overhead supplemental cooling, supplemental cooling units are placed above the enclosures.

This drives cooling efficiency by bringing cooling units closer to the load and uses the principle that cold air falls and hot air rises. While this design strategy is very effective at enclosure loads of 6kw and above it often requires cabinet and/or room modifications to support the required cooling medium and extra plumbing.

Chimney or Ducted Return:
A ducted return strategy places solid doors placed on enclosures and a chimney is added to the top to duct out the hot air back to the CRAC. This minimizes mixing intake and exhaust air and shortens the return path for exhaust air back to CRAC. While inexpensive to implement this strategy begins to fail at enclosure loads above 3kw and the increased pressures can negatively impact server fan performance.

Our Unity Cooling Solution is very innovative. Chimney/Ducted Air Separation has proven very effective. Our partners patented Unity Cooling design (their fan system is pressure activated) creates a zero pressure environment, matching CRAC, Server and Return CFM to optimize Cooling efficiency and effectiveness. Recent evaluations have proven it is even a very good "Small Space" Cooling Solution.

Intelligent Airflow Management:
It is widely known that air-flow distribution management is one of the best opportunities for cooling efficiency gains.
Basic Air-Flow Solution = Utilizing networked temperature sensors, our controller ties into existing CRAC’s (preferably with VFD technology) and modulates air delivery based on real time temperature feedback to improve efficiency. This is accomplished by matching delivered air with cooling requirements in a more ‘Zonal’ approach.
Advanced Air-Flow Mgt. Solution = Room Scale Intelligent Cooling (RSIC) – A similar concept to the above but a much more precise/ micro approach to optimization. Using CFD data on the front end, networked floor tile based Air-Movers, temperature sensors and return Air-Movers are deployed to optimize air delivery, minimize air mixing and effectively remove hot air.

The key is the precision/micro delivery of cold air where it needs to be (rack/row level) precisely when it needs to be there. The same is true for heat extraction. Typically 20-30% of the current CRAC/CRAH capacity can be idled for hot standby.

The result of a successful RSIC deployment is a fully optimized, maximum efficiency cooling environment. Efficiency gains average 20-30% and results of 52% have been experienced. The solution includes very robust alarming, notification, tracking and trending capabilities and can include a very advanced thermal monitoring service.

Container Based Data Centers:
Container Based Data Centers are quite literally a data center in a box. Typically configured in a 20 or 40 foot steel container these data centers contain the cooling and equipment enclosures within, so cooling is only provided to the equipment. This solution is great for high density applications as it can allow for up to 40kw per enclosure. A container based data center can also be a good option for expanding an existing data center that is out of traditional cooling capacity and/or space.

Micro Container Based Data Centers:

Micro Container Based Data Centers takes advantage of their zero by-pass, closed loop on board cooling to provide efficient cooling directly to the enclosure. Both the hot and cold aisles are contained at the enclosure level and this solution does not require raised floor or existing CRAC/CRAH to deploy. The Micro Container Based Data Center supports loads from 12kw (air cooled) to 16.5kw (water cooled).


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