Cooling Requirements; Basic Air Conditioning Equipment Requirements; Air Conditioning System Guidelines; Air Conditioning System Types - HP BL685c - ProLiant - 4 GB RAM Site Planning Manual

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Ensure that all ceiling tiles are in place.
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Ensure a minimum of 457 mm (18 in) or local code minimum clearance, whichever is larger, from
the top of the rack to the fire sprinkler heads.

Cooling requirements

Air conditioning equipment requirements and recommendations are described in the following sections.

Basic air conditioning equipment requirements

The cooling capacity of the installed air conditioning equipment for the computer room should be
sufficient to offset the computer equipment dissipation loads, as well as any space envelope heat gain.
This equipment should include the following:
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Air filtration
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Temperature control
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Humidity control
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Air distribution
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System controls adequate to monitor and maintain the computer room within specified operating
ranges
Lighting and personnel heat loads must also be included when calculating the total heat load for the
computer room. For example, a person dissipates about 450 BTU/h while performing a typical computer
room task.

Air conditioning system guidelines

HP recommends the following guidelines when designing a computer room air conditioning system and
selecting the necessary equipment:
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Design the air conditioning system for 24-hour-a-day, 365-day-a-year operation.
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Provide an air conditioning system that is independent of other systems in the building.
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Provide one of the following:
A redundant air conditioning system
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Sufficient extra cooling capacity to ensure availability of the computer equipment if a partial air
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conditioning system failure occurs
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Provide space and facilities for future system expansion.
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Specify air conditioning equipment air filters with a minimum rating of 45 percent (based on
ASHRAE Standard 52-76, Dust Spot Efficiency Test).

Air conditioning system types

HP recommends the following air conditioning system types:
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Chilled water package unit with remote chilled water plant
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Air cooled package unit with remote air cooled chilling plant
General site preparation guidelines 9