Colocation Facility Cooling Technique Considerations

Most businesses know to locate a colocation facility that has very good Internet service and Internet provider and carrier options. On the other hand, cooling systems are frequently overlooked. Most servers now are made to operate at normal office conditions, which mean that two environmental factors should be met:

• The temperature should stay between 72° F and 76° F
• The humidity ought to be between 45% and 60%, with 45% ideal
• Cooling units have to be on continuously, so servers will not overheat (this precludes standard HVAC units).

If the cooling technique goes down, it can cause the equipment to overheat, causing the network to go down and even damaging equipment. Colocation facility cooling systems include three areas: the facility layout, chillers, and laptop or computer room air conditioning (CRAC) units.

Facility Layout
Servers generate heat as they run. This is generally blown out the back on the server by fans; cool air is taken in through vents at the front. Server racks and rows should be laid out to manage hot air coming from the servers and conditioned air going to their intakes by designating “hot rows,” which face the server fans, and “cold rows,” which face the intakes. Designated hot and cold rows keep air circulating in the very best directions to keep servers from overheating.

Facility Design
You can find two kinds of building design for colocation facilities: raised floor and solid floor. Raised floor was the preferred structure when servers were towers because the mesh flooring allowed air conditioned air to blow from the bottom directly across their intakes. Nevertheless, since servers are stacked in racks, cold air ought to reach the tops on the racks to cool machines. Solid floor facilities are a better option. The facility should take into account the following:

• Solid floor designs must have mesh front and rear doors for th server cabinets to enable hot air to escape.
• For raised floor designs, cold air must have enough air pressure to force air to the top from the server cabinets. Ideally, special duct work will be in place to force the airflow upward.
• For raised floors, server cabinets need to not have vents in the doors that would let cool air escape.

Chiller Systems
Chillers pipe water or water/glycol coolants via the CRAC units. Chiller systems include pumps, pipes, and the chillers themselves. The following points should be considered to make sure that the system is adequate to cool the facility:

• Sufficient capacity
• Backup units for the pumps and chillers which switch over automatically
• Regular maintenance

CRAC Units
CRAC units are massive, dedicated air conditioners which manage temperature and humidity. They have several parts and are complicated – meaning failures might be common. The CRAC units should be well maintained, but the most important thing is redundancy. Redundancy is determined by the overall capacity in the CRAC units; there ought to be enough units that even with a failure, the facility will still be adequately cooled. As with chillers, capacity for CRAC units is determined by tons per square foot.

Verify Capacity
Capacity is determined by the ratio of tons per square foot. To determine whether a system has sufficient capacity, divide the total tonnage of the units by the square footage from the building. If you can find four 30-ton CRAC units in a 4,000 square foot facility, then the CRAC capacity is .030 tons per square foot (120 tons / 4,000 square feet). The ideal ratio of tons to square feet for the CRAC program is .030 ton/square foot or higher; the ratio need to not be below .025 tons/square foot. This same formula is employed for chiller systems, with the same ideal ratios.

It really is critical to look for a colocation facility that has World-wide-web provider options and backup power systems. Equally critical is really a facility with the right design, chillers, and CRAC units to cool the server room. Keeping equipment from overheating will keep networks up and makes equipment last longer. Like Internet connections, network uptime, and power backups, cooling systems signify a quality colocation facility.

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