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42 C120-H007-05EN
CHAPTER 4 Air Conditioning
(2) Lowering the underfloor temperature
In unattended areas where paper is not used and where only those devices that have
broad permissible underfloor and room temperature and humidity ranges are installed,
the underfloor temperature may be lowered. As an example, in an unattended room
associated with a large system installation involving multiple computer rooms, hold
the underfloor relative humidity to 70% or below to keep the room humidity at a
lower level.
Table 4.3 summarizes the practical temperature and humidity recommendations that
apply to lowering the underfloor temperature.
Figure 4.6 is an air-line diagram applicable to lowering the underfloor temperature.
Figure 4.6 Psychrometric chart applicable to lowering the underfloor temperature
Table 4.3 Temperature and humidity recommendations (lowering the underfloor
temperature)
Air
conditioning
setup
Near the underfloor air outlet Detection and regulation point
RemarksTemperature
Humidity
%
Temperature Humidity
%
°C °F °C °F
Underfloor
ventilation
17±1 °C 63±2 °F65±5% Targeted
at 24 °C
Targeted
at 75 °F
About 42%
at 24°C (75°F)
The
temperature
and humidity
depend on
the thermal
load.
16±1 °C 61±2 °F65±5% Targeted
at 24 °C
Targeted
at 75 °F
About 40%
at 24°C (75°F)
Combined use
of direct
blowing or duct
blowing and
underfloor
ventilation
17±1 °C 63±2 °F65±5% 24±2 °C75±4 °F42±5% ⎯
16±1 °C 61±2 °F65±5% 24±2 °C75±4 °F40±5%