Tag Archives: computer room air

Air Conditioning Heating Terms Definitions & Acronyms

This is a comprehensive list of HVAC Acronyms and HVAC Terms. High Performance HVAC is certain there are more terms and acronyms. If you know of something we missed please email us. Thanks! AC – Air Conditioning or Alternating Current ACCA – Air Conditioning Contractors Associations AFUE – Annual Fuel Utilization Efficiency AHU – Air Handling Unit AI – Analog Input AMCA – Air Movement and Control Association AO – Analog Output AQS – Air Quality Systems ASHRAE – American Society of Heating, Refrigerating, and Air Conditioning Engineers AV – Automatic Air Vent AWG – American Wire Gage B – Boiler BACnet – Computer communication protocol for building automation systems and control networks BAS – Building Automation System BI – Binary Input BMS – Building Management System BO – Binary Output BP – Backflow Preventer BTU – British Thermal Unit BTUh – Brtish Thermal Units per Hour

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Cooling Tower Evaporation Cools Water

Cooling Tower Evaporation Cools WaterCooling towers use the process of evaporation to cool or removes heat from the condenser water that was transferred to the water in the chiller condenser barrel. The heat is absorbed at the load in this case in a data center on a data center floor. The servers and electrical equipment produce a massive amount of sensible heat. The heat is absorbed by computer room air conditioners or computer room air handlers. These systems, computer room air handlers and air conditioners, have chilled water coils. The chilled water originates at the chiller into the primary loop. The water circulates through the primary loop and makes its way into the secondary loops of the chilled water loop.

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Data Center Perforated Tiles for Cooling Servers

Data Center Perforated Tiles for Cooling ServersThere is a lot to consider with perforated tiles in data centers and depending on who you talk to you will get different answers. The server floor in a data center is typically built on a raised floor with cold air being pumped under the floor by large CRAH(Computer Room Air Handlers) or CRAC units (Computer Room Air Conditioners). This cold air is flows through the perf tiles and into the data center to cool the load of the heat the servers and other ancillary data center electrical equipment produce. The data center load is a sensible load as data centers do not have a lot of humidity in them from outside sources so the cooling equipment need only be capable of cooling the sensible load with little worry about any latent loads.

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Computer Room Air Conditioner Units

Computer Room Air Conditioner UnitsComputer Room Air Conditioner Units are essential inside data centers where cooling is necessary for all the computer and electrical equipment most data centers utilize. It is important to keep the equipment cool to prevent overheating for some equipment. Removing the heat is the job of CRAC units in some cases and in other cases large Data centers use large air handlers to remove the heat however CRAC Units are the commonly used HVAC equipment used in most data centers for cooling data center equipment such as computers and electrical equipment. In a typical data center heat loads include servers, ups systems, power distribution units, static and automatic transfer switches, switchgear and other electrical equipment that produces heat during normal operation.

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DX CRAC Unit Condensers

DX CRAC Unit CondensersMost data centers do not utilize HVAC DX (Direct Expansion) CRAC units or air conditioning but instead use chilled water systems to provide cooling for the data center. In smaller buildings such as remote telecom buildings DX air conditioning systems are used to keep the equipment cool and operating efficiently. A DX CRAC Unit uses vapor compression refrigeration to provide cooling with a chemical refrigerant versus a chilled water system that utilizes chilled water from a chiller. CRAC Units or Computer Room Air Conditioners also serve telecom facilities for telephone services including cellular telephone facilities in remote locations. The CRAC units that serve telecom facilities in remote locations are typically DX CRAC Units that have utility back-up by stand-by generator so that if the utility fails to provide electricity for whatever reason the stand-by generator kicks on and provides power so that the telecom facility can remain on line.

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SUNDAY, APRIL 13, 2014

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