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C120-H007-05EN 41
4.3 Air Conditioning Conditions
Figure 4.5 is an air-line diagram depicting the relationships between the dry-bulb
temperature, relative humidity, and absolute temperature.
Figure 4.5 Psychrometric chart applicable to changing the room temperature
Table 4.2 Temperature and humidity recommendations (changing the room
temperature)
Air conditioning
setup
Near the underfloor air
outlet
Detection and regulation
point
Humidity
%
Remarks
Temperature
Humidity
%
Temperature
°C °F °C °F
Direct blow or
duct blow
⎯ ⎯ ⎯ Setting:
Between 21
and 26 Width
of variation:
±2 °C
Setting:
Between 70
and 79 Width
of variation:
±4 °F
45±5% ⎯
Underfloor
ventilation
18±1 °C 64±2 °F65±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.
Do not
change the
flow rate
even if the
underfloor
temperature
is changed.
19±1 °C 66±2 °F62±5% Targeted
between
24 and 25°C
Targeted
between
75 and 77 °F
About 43% at
24°C (75°F)
20 ±1 °C 68±2 °F58±5% Targeted
between
24 and 26 °C
Targeted
between
75 and 79 °F
About 40% at
26°C (79°F)
Combined use of
direct blowing or
duct blowing
and underfloor
ventilation
18±1 °C 64±2 °F65±5% 24±2 °C75±4 °F 40 to 50% Do not
change the
flow rate
even if the
underfloor
temperature
is changed.
19±1
°C 66±2 °F62±5% 25±2 °C77±4 °F 40 to 48%
20 ±1 °C 68 ±2 °F58±5% 26±2 °C79±4 °F 40 to 45%