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40 C120-H007-05EN
CHAPTER 4 Air Conditioning
4.3.3 Temperature and humidity recommendations for computer
rooms
Practical temperature and humidity recommendations that apply to changing the room
temperature from the basic recommendations or to lowering the underfloor
temperature in unattended areas where paper is not used are explained below.
(1) Changing the room temperature
Before changing the room temperature of a computer room from the basic
recommendations consider the following:
z Keep the room humidity constant when direct blowing or duct blowing is used.
z If underfloor ventilation and room air conditioning is combined, keep the absolute
temperature, which is a measure of the water content of the room air, equivalent to
a temperature of 24°C (75°F) and a humidity of 45%. Do not change the flow rate
even if the underfloor temperature is changed.
Table 4.2 summarizes the practical temperature and humidity recommendations that
apply to changing the temperature from the basic recommendations.
Table 4.1 Recommended temperatures and humidities for computer rooms
Air
conditioning
setup
Near the underfloor air outlet Detection and regulation point
Remarks
Temperature
Humidity %
Temperature
Humidity %
°C °F
°C
°F
Direct
blowing or
duct blowing
⎯
⎯ ⎯ 24 ±2 °C75±4°F45±5% ⎯
Underfloor
ventilation
18±1 °C 64±2 °F 65±5% Targeted
at
24 °C
Targeted
at
75°F
About 45%
at 24°C
(75°F)
The
temperature
and
humidity
depend on
the thermal
load.
Combined
direct
blowing or
duct blowing
and
underfloor
ventilation
18±1 °C 64±2 °F65±5% 24 ±2 °C75±4°F45±5% ⎯