User's Manual

Design
P/N 81-CO2MAN-001 3-11 September 2013
(Equation 5)
Where:
= Enclosure leakage rate, lb./min (kg/min)
= Leakage rate from Figure 3-2, lb./min/
ft.
2
(kg/min/m
2
)
= Effective leakage area from Equation (4),
ft.
2
(m
2
)
Figure 3-2. Calculated CO
2
Loss Rate

Note: The loss rate shown in the figure is based on assumed 70°F (21°C) temperature within
the enclosure and 70°F (21°C) ambient outside.
Once the leakage rate is determined, the amount of additional carbon dioxide that is required
for compensation can be calculated.
(Equation 6)
Where:
= Quantity of agent to compensate for uncloseable openings, lb.(kg)
= Enclosure leakage rate from Equation (5), lb./min (kg/min)
= Duration of protection minute, min
q
L
LA
L
=
q
L
L
A
L
W
L
q
L
t
P
=
W
L
q
L
t
P