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34 C120-H007-05EN
CHAPTER 4 Air Conditioning
4.1.2 Air conditioning conditions and capacities
The air conditioning system must have the capacity to be able to process the amount
of heat dissipated from the computer equipment to cool the computer room. A server
system
generates heat from the Power Supply Unit, semiconductor devices, etc. The
rated or listed capacity of the air conditioning facilities may have been measured for a
general office for human beings as specified by the relevant industrial standards or the
like and may not be readily applicable to a server room environment. Consultation or
design by a professional engineer is required for determining the capacity of an air
conditioner to be used in a computer room.
4.1.3 Service time and reliability
The air conditioning facilities for a computer room must be kept operable at all times.
A large number of relatively low-capacity units are recommended. Maintain the room
air at a somewhat lower temperature, so that even if one unit fails, there would still be
time to take corrective action before a critical temperature is reached. The installation
of spare units to back up the primary units is also recommended.
4.2 Styles of Air Conditioner
Air conditioner installations for computer rooms can be grouped into four broad styles
as listed below. Choose from them to suit the user's architectural requirements, the
size of the system installation, layout constraints, etc.
z Direct blowing
z Duct blowing
z Underfloor ventilation
z Combined use of direct or duct blowing and underfloor ventilation
These methods are detailed as below: