Soluciones de Enfriamiento o Climatizacion

An efficient cooling system is key to controlling operating expenses in a Data Center. A typical cooling system consumes about 40% of a Data Center's energy costs.


At WESCO | Anixter, we believe there are some simple approaches that can be adopted throughout the cooling path or cycle from the Air Conditioning unit to the equipment cabinet and vice versa to optimize airflow, thus increasing efficiency.

 

Differences between Comfort VS Precision Air Conditioners

Comfort Air Conditioning

Comfort cooling systems are traditional air conditioning systems used in offices or homes.

Their primary purpose is to keep people at a comfortable temperature throughout the year.

Precision Cooling

Precision cooling systems have been specifically designed to control temperature and humidity, have a high reliability level as they operate all year round. They provide ease of maintenance, redundancy and flexibility. Recommended for data centers and telecommunications rooms.

Features

  • 24/7 x 365 Operation: it remains in operation 24 hours a day, 365 days a year, which translates into 8760 working hours without interruption. This system was designed to ensure minimal downtime, thanks to special components and a built-in redundancy system (in some cases).
  • Optimal humidity and cooling levels: Unlike comfort cooling, precision air conditioning can meet the needs of sensitive IT equipment and dense electrical heat loads, as 90% - 95% of it is composed of sensible cooling to displace the high levels of heat emitted by the equipment. Just like precision air conditioning systems, it maintains temperature (+/- 1%) and humidity within a very narrow range (+/- 3%-5%).
  • Scalability and Adaptability: The precision cooling system provides a cost-effective and energy-efficient solution. It maintains a high level of flexibility that will allow it to adapt to future devices and technologies.
  • More air in motion: Precision air conditioning systems operate at a high airflow rate per unit of heat removed, generally 160 cubic feet per minute (271m³/h) or 76 liters per second, per each kW or higher. This high volumetric rate moves a greater amount of air through the room (160 cfm/kW), allowing it to improve air distribution to reduce the possibility of localized heat concentrations.
  • High levels of filtration: A precision air system uses specialized filters to prevent dust particles from entering IT equipment and damaging it.


Challenges of good thermal management

  • Cabinet densities are increasing: On average cabinet densities are increasing. Through virtualization, physical space is decreasing, but those cabinets are increasing in power density. A denser cabinet can be difficult to "cool" or provide good climate control. Sort in cold aisles, hot aisles.
    Arrange cabinets front-to-front and/or back-to-back to prevent IT equipment from absorbing heat from other equipment.
  • Lack of Airflow Management: Simple things like placing blanking panels, removing or organizing cabling from the underside of the technical floor or the backs or fronts of cabinets and using cable brushes.
  • Adjust cooling with IT load: Properly adjust your cooling infrastructure and react dynamically to changing IT application requirements.
  • Complex design considerations: There are many options and methodologies. Liquid cooling, backdoor heat exchanger, rooftop cooling, in-row cooling systems, refrigerants, water. Even with airflow management, there is aisle containment (cold, hot and stacks), curtains, active or passive airflow management, etc.
CRAC

Perimeter Air Conditioning (Computer Room Air Conditioning - CRAC)

Precision air conditioning equipment perimeter type (In-Room). This equipment is located inside the perimeter of a Data Center room and it is recommended to place it perpendicular to the cabinet rows and in front of the hot aisles.

It consists of an evaporator that is installed inside the room or computer room and a condenser that is placed on the outside of the building.

Ceiling air

 

 

Ceiling Air Conditioner

Precision air conditioning equipment that is placed in the upper part of a room or a computer or telecommunications room. In some cases, arrangements are made through ducts to extract hot air or inject cold air.

In Row

 

In-Row Air Conditioning

Precision air conditioning equipment located in the rows at the side or between cabinets. In-row cooling capacity is provided while occupying minimal space.

Aisle containment systems are modular systems that incorporate panels and sliding or hinged door systems to contain hot or cold air.

Which is the best method? Is one form of containment more efficient than the other? This is FALSE. Research has shown that cold aisle containment, hot aisle containment or stacks have no advantage over others.

CAC

 

Cold Aisle Containment (CAC)

  • Cold aisle containment or cold aisle confinement.
  • Easier to implement with false floor
  • Few stand-alone cabinets
  • Hotter working conditions

Hot Aisle Containment (HAC)

  • Hot aisle containment or confinement.
  • False Ceiling installed
  • Many stand-alone cabinets
  • Cooler working conditions

Vertical Exhaust Duct (VED) - Chimneys in Cabinets

  • In this system, ducts or stacks are used in cabinets.
  • False Ceiling installed
  • Scattered high density cabinets

False floor or raised technical floor, uses a metallic structure and on top of it laminated steel plates filled with cement are mounted. A minimum height of 60 cm should be considered when used for air conditioning injection.

Raised Floor

Floor

Considerations to know for the design:

  • Site area, length and width.
  • Structure height (pedestals height).
  • Tile size 60x60 cm for metric sizes or 24x 24 inches for imperial sizes.
  • Check if ramp or steps are required.
  • Load capacity, which can be from 1250 to 1500 lbs/sqin in common form.

Air Flow in Grilles - Tate- Triad

Perforated plates are used for airflow control. The process of directing airflow from the cooling unit to the computer equipment and back can be defined. Air flows as much as water and takes the lowest resistance path. That is why it is crucial to help guide the air to where it should have an impact. Perforated plates or grilles with different perforation percentages ranging from 25% to 65% are used for this purpose.

There are accessories that allow us to avoid recirculation and avoid bypassing the air that is injected into the IT equipment.

Air Compression Foam, Smooth Panels, Air Leakage Prevention, CRAC Extensions

Here are some examples of accessories:

  • Special foam seals for sealing cable passages, which are very useful for irregular areas.
  • Blanking Panel to place in the free spaces of a cabinet, individual of 1, 2 units, solid or brush for cable routing.
  • Brush type cable routing systems.
  • Extensions for precision air conditioning equipment (Computer Room Air Conditioning - CRAC).

 

Scalable panels and air deflectors.

Scalable blanking panels or curtain panels to cover cabinet spaces or the entire space of a cabinet.

Air deflectors, to manage air to where it is required.

 

Technological Allies

APC
Rittal
CPI
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Panduit
Upsite technologies
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Vertiv

 

Cooling Resources

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