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08.10.2015
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Many data centers historically didn’t put much more thought into their deployment of server racks beyond basic functionality, air flow, and the upfront costs of the rack itself. In a survey conducted by the Uptime Institute, enterprise data center managers responded that 39% of them expected that their data centers would run out of cooling capacity in the next 12-24 months and 21% claimed they would run out of cooling capacity in 12-60 months.
In this scheme, the cabinets are adjoined into a series of rows, resting on a raised floor.
While doors are important, the rest of the enclosure plays an important role in maintaining airflow. With a close-coupled cabinet orientation, containment has fully evolved both hot aisle and cold aisle within the same cabinet footprint. Like hot aisle containment, green field data centers can plan for close-coupled cooling in advance, ensuring that chilled water piping and the necessary infrastructure is in place. For an existing space without the infrastructure or space to expand, there’s little recourse for using the already populated enclosures with close-coupled cooling. For those with the infrastructure and space, the efficiency gains for close-coupled cooling are compelling-most notably at the mechanical chiller plant and the potential for free cooling with water-side economizers. The server enclosure, once an afterthought in data center planning, has become a pertinent talking point, for no cooling strategy can exist without it.
Add up the wattage of each device and convert it to BTU (a device’s manual usually lists its wattage). If a rack air conditioner will be used, for every 1 kW consumed, consider that 3412.14 BTU is generated.
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These days, the widespread adoption of hi-density applications are causing major hot spot concerns and capacity issues. Keeping operating costs down is a key concern of all CTOs and Data Center Managers. The biggest energy costs in running a data center is in cooling, so having a sound server rack strategy is critical to your overall data center energy consumption and operating costs.
The power required to cool IT equipment in your data center far exceeds the power required to run that equipment and because of this, overall power in the data center is fast reaching capacity.


Despite many different manufacturers, the makeup of a server enclosure remains consistent: folded and welded steel, configured to secure servers, switches, and connectivity- the lifeblood of any on-demand organization. Perhaps no accessory in the data center is more important because of the equipment it holds and the data it safeguards.
The design uses air conditioners, fans, and raised floors as a cooling infrastructure and focuses on separation of the inlet cold air and the exhaust hot air. The front of each row becomes a cold aisle, due to the front-to-back heat dissipation of most IT equipment. For this reason, perforated doors remain the standard for most off-the-shelf server enclosures, though there’s often debate about the amount of perforated area needed for effective cooling.
Medium to high density installations have proven difficult for this layout because it often lacks precise air delivery.
Some cabinet manufacturers are taking this premise further, making the goal of complete air separation (or containment, if you will) a reality for the data center space. The aisle then becomes a room unto itself, sealed with barriers made of metal, plastic, or Plexiglas.
The cabinets, already loaded with equipment and likely secured to the floor, should not need to be moved or altered.
The same barriers now encase the hot aisle in the hopes of returning the warmest possible air to the air conditioners, which have changed in form and location. The equipment cabinet is adjoined to a row-based air conditioner (chilled water based), which, like the hot aisle containment design, achieves efficiency through proximity.
Existing data centers with mechanical capacity could use the product for a thermal neutral expansion- deploying new high density blades, for instance, in an isolated cluster. Many data center authorities stress that new cooling approaches are essential to achieving energy efficiency. Try our interactive data center efficiency calculator and find out how reducing your PUE will result in significant energy and cost savings!
You can also determine wattage with the following formula (Watts=Volts X Amps).(5) Remember that 1,000 Watts=1kW. These factors, along with the high costs of energy, require a sound understanding of how closely tied your server rack deployment is to overall server room and data center efficiency strategy. Over the coming years, most medium to larger organizations will be adopting virtualization and higher density servers. In the same Uptime survey, 42% of these data center managers expected to run out of power capacity within 12-24 months and another 23% claimed that they would run out of power capacity in 24-60 months.


The enclosure comes in a variety of dimensions (height x width x depth) and is often customizable to a user’s individual needs with provisions for cable management and PDU installation. Though it consumes no electricity and contains no moving parts, the enclosure orientation has a significant impact on a data center’s ability to become an energy efficient enterprise. Air conditioners, positioned around the perimeter of the room, push cold air under the raised floor and through the cold aisle, where it’s ingested by the servers. To maintain spacing, end users must establish a consistent cabinet footprint, paying particular attention to enclosure depth. Even with provisions at the enclosure such as blanking panels and air dams, bypass air is common as is hot air recirculation. These barriers prevent hot exhaust air from re-circulating, while ensuring the cold air stays where it’s needed at the server intake. The process begins, according to The Green Grid, with airflow management-an understanding of how air gets around, into, and through the server enclosure.
As energy costs continue to rise and as your data center grows and expands, companies will look to their facilities and data center managers for sound strategies on how best to address those rising energy costs.
As the air moves through the servers, it’s heated and eventually dissipated into the hot aisle.
These extra pieces must coexist with any cable management scheme or any supplemental rack accessories the user deems necessary. Thus, more cold air is thrown at the servers to offset the mixing of the air paths, requiring excess energy at the fan and chiller levels. With mixing out of the equation, users can afford to set thermostats higher and return very warm exhaust air to the air handlers. They must be sized accordingly and attached firmly to the end of the rows and the tops of the enclosures.
From this location, the air conditioner captures exhaust air, cools it, and returns it to the cold aisle where the process recurs.
The combination of proximity and isolation allows for extremely dense installations of ~35kW per rack.
While accommodating deeper servers, this extra space allows for previously mentioned, cable management products, rack accessories, and rack-based PDUs.



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