4000-S
ERIES
I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
68 of 154
SECTION 16: COOLING SPECIFICATIONS
16.1 Evaporative Coolin
g
Table 21: Formulas
* Bleed-off and recirc
u
lation rates
w
ill
v
ary
w
ith
locale,
w
ater q
u
ality and chemical treatment
program. These
v
al
u
es are only for approximation.
NOTE:
Refer to sat
u
ration efficiency table belo
w
.
Table 22: Abbreviations
Table 23: Evaporation Rate
• Heat of
v
aporization = 1043 BTU/lb
• Weight of
w
ater = 8.34 lb./Gallon
• GPH = CFM x WBD x SE x 1.08/1043/8.34 = CFM x WBD x SE/8050
Table 24: Su
gg
ested Air Chan
g
es Per Hour (Air
Chan
g
e Method)
* For existing b
u
ildings: A
v
erage amo
u
nt indoor
temperat
u
re exceeds ambient o
u
tdoor temperat
u
re
w
hen e
v
aporati
v
e cooling is not in
u
se.
** Experience has sho
w
n that significant benefit can
be achie
v
ed
w
ith 10-15 Air Changes per Ho
u
r (AC/
Hr) thro
u
gh the lo
w
est 12' of the facility. For a 24'
high b
u
ilding, this
w
o
u
ld mean 5-6 Air Changes per
Ho
u
r (AC/Hr) for the entire
v
ol
u
me. This
w
ill
v
ary by
application.
Table 25: Saturation Efficiency at Stated Media
Depth
Table 26: Static Pressure Drop (in wc) at Stated
Media Depth
NOTE:
Moist
u
re limiter press
u
re drop is added for
face
v
elocities greater than 600 Feet per Min
u
te
(FPM). Rapid Engineering LLC's standard media
thickness eq
u
als 12".
Formulas
1
Lea
v
ing Dry B
u
lb = ODB – [SE* x (ODB - OWB)]
2
Lea
v
ing Wet B
u
lb = Entering Wet B
u
lb (act
u
ally, it’s slightly less
than the entering
w
et b
u
lb, b
u
t is normally considered eq
u
al.)
3
Wet B
u
lb Depression = ODB – OWB
4
E
v
aporation Rate (GPH) = CFM x WBD x SE/8050
5
Bleed-off Rate = approximately 20% of e
v
aporation rate*
6
Recirc
u
lation Rate = approximately 3 times e
v
aporation rate*
Abbreviations
CFM
C
u
bic Feet Per Min
u
te
GPH
Gallons Per Ho
u
r
IDB
Indoor (Design) Dry B
u
lb Temperat
u
re
LDB
Lea
v
ing Dry B
u
lb Temperat
u
re
LWB
Lea
v
ing Wet B
u
lb Temperat
u
re
ODB
O
u
tdoor (Design) Dry B
u
lb Temperat
u
re
OWB
O
u
tdoor (Design) Wet B
u
lb Temperat
u
re
SE
Sat
u
ration Efficiency of the E
v
aporati
v
e Media
WBD
Wet B
u
lb Depression
Wet Bulb
Depression (°F)
Gallons per Hour (GPH) Per 1,000 Cubic Feet per Minute (CFM) at Stated Saturation Efficiency
0.
8
0
0.
8
2
0.
8
4
0.
8
6
0.
88
0.90
0.92
0.94
0.96
0.9
8
5
0.50
0.51
0.52
0.53
0.55
0.56
0.57
0.58
0.60
0.61
10
0.99
1.02
1.04
1.07
1.09
1.12
1.14
1.17
1.19
1.22
15
1.49
1.53
1.56
1.60
1.64
1.68
1.71
1.75
1.79
1.83
20
1.99
2.04
2.09
2.14
2.19
2.23
2.28
2.33
2.38
2.43
25
2.48
2.55
2.61
2.67
2.73
2.79
2.86
2.92
2.98
3.04
30
2.98
3.05
3.13
3.20
3.28
3.35
3.43
3.50
3.58
3.65
35
3.48
3.56
3.65
3.74
3.82
3.91
4.00
4.08
4.17
4.26
40
3.97
4.07
4.17
4.27
4.37
4.47
4.57
4.67
4.77
4.87
45
4.47
4.58
4.69
4.80
4.92
5.03
5.14
5.25
5.36
5.48
Leavin
g
Air
Temperature
(°F DB)
Indoor Air
Temperature Above
Ambient (°F)*
Air Chan
g
es/Hour**
78°
20°
30 - 60
76° - 78°
15° - 20°
20 - 40
74° - 76°
10° - 15°
15 - 30
72° - 74°
5° - 15°
12 - 20
< 72°
< 10°
10 - 15
Airflow
Feet per
Minute (FPM)
6"
8
"
12"
1
8
"
24"
400
0.71
0.81
0.90
0.98
0.99
500
0.68
0.79
0.89
0.98
0.99
600
0.66
0.77
0.88
0.97
0.99
700
0.64
0.75
0.87
0.97
0.98
Airflow
Feet per
Minute (FPM)
6"
8
"
12"
1
8
"
24"
400
0.06
0.09
0.14
0.19
0.24
500
0.09
0.14
0.21
0.30
0.39
600
0.13
0.20
0.30
0.42
0.55
700
0.23
0.31
0.44
0.62
0.80
Summary of Contents for 4044
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