User's Manual

Design
September 2013 3-14 P/N 81-CO2MAN-001
3-5.2.4.3 Extreme Temperatures
An additional quantity of carbon dioxide must be provided to compensate for abnormally low
or high ambient temperatures.
For applications where the normal ambient temperature in the enclosure is above 200°F
(93°C), a one-percent increase in the calculated total quantity of carbon dioxide must be
provided for each additional 5°F (2.78°C) above 200°F (93°C).
(Equation 8)
(US Units)
or
(Metric Units)
Where:
= High temperature correction factor
= Degrees Fahrenheit (Celsius) above 200°F (93°C)
For applications where the normal ambient temperature is less than 0°F (-18°C), a one-
percent increase in the calculated total quantity of carbon dioxide must be provided for each
1°F (0.55°C) below 0°F (-18°C).
EXAMPLE 4 - TOTAL FLOODING FOR SURFACE FIRES - Forced Ventilation
Consider a room with dimensions of 20 ft. by 30 ft. by 10 ft. . Determine the
additional carbon dioxide required to compensate for a 1,000 CFM ventilation rate that cannot
be shut off. The design concentration is 34% and the duration of protection will be 1 minute.
From Equation (7):
Where is the Quantity of Agent Lost, is the Ventilation Air Flow Rate, is the
Duration of Protection, is the Material Conversion Factor, and is the Volume Factor.
= 1000
ft.
3
/min
= 1 min
= 1.0, from Figure 3-1 for 34% concentration
= 20 ft. x 30 ft. x 10 ft.
= 6,000
ft.
3
= 20 ft.
3
/lb. from Table 3-2 for volumes 4,501 ft.
3
to 50,000 ft.
3
.
L
W
H
W
V
q
V
t
P
f
C
 f
1
=
W
V
qV
t
P
f
C
f
1
qV
t
P
f
C
V
V
f
1
W
V
q
v
t
p
f
C
 f
1
=
W
V
1000 1 1.0 20=
W
V
50 lb.=

H
T
High
5=

H
T
High
2.78=

H
T
high