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This chapter describes which items require considerations when laying out air
conditioning facilities.
4.1 Characteristics of Computer Room Air
Conditioning
Computer room air conditioning is characterized by:
zConstant temperatures and humidities
zAir conditioning conditions and capacities
zService time and reliability
These are detailed as below:
4.1.1 Constant temperatures and humidities
While most server system has wide permissible temperature and humidity ranges as
described later, it is recommended that the computer room be maintained at a constant
temperature and humidity to provide operational stability, fewer media effects, and a
good operator environment. A stable environment is important because the computer
room houses semiconductor devices, which are easily affected by thermal shocks,
precision mechanical parts, which are liable to thermal expansion due to temperature
changes, and print forms, toner, OMR and OCR forms, paper tape and other kinds of
media, which are susceptible to the effects of humidity changes. A computer room
requires temperature and humidity regulation, while guarding against electrostatic
effects at low humidities and dew condensation caused by underfloor ventilation at
lower temperatures and humidities.