User's Manual
Design
September 2013 3-46 P/N 81-CO2MAN-001
EXAMPLE 11 - LOCAL APPLICATION: RATE-BY-VOLUME - Assumed Enclosure
Consider a hazard with outside dimensions 4 ft. x 6 ft. x 3 ft. . Calculate the
design discharge rate and minimum agent supply for a Rate-by-Volume application.
Assume an enclosure about the hazard:
Assumed Enclosure Dimensions: ft. x 10 ft. x 5 ft.
= 8 ft. x 10 ft. x 5 ft. = 400 ft.
3
From Equation (30):
Where is the Minimum Discharge Rate, is the Design Flow Rate per Unit Volume,
and is the Volume of the Assumed Enclosure.
From Equation (29):
Where is the Open Area of the Assumed Enclosure Walls and is the Total Area of
Assumed Enclosure Walls.
= (8 x 5) + (10 x 5) + (8 x 5) + (10 x 5)
= 180
ft.
2
= (8 x 5) + (10 x 5) + (8 x 5) + (10 x 5)
= 180
ft.
2
= 0.75 x ( ) + 0.25
= 0.75 x (180 180) + 0.25
= 1.0 lb./min./
ft.
3
W
L
H
3'
2'
2'
6'
2'
2'
4'
2'
W
L
H
V
q
min
q
v
V=
q
min
qV
V
q
V
0.75 A
O
A
W
0.25+=
A
O
A
W
A
W
A
W
A
O
A
O
qV
A
O
A
W
qV
qV