Instruction Manual

12
ClimaCool Selection Procedures
T
he following information must be known in order to properl
y
selec
t
a
ClimaCoo
l
®
modular chiller
:
•
Sy
stem ca
p
acit
y
•
Entering chilled water temperatur
e
•
C
hilled water fl ow rate
•
Leaving condenser temperatur
e
If an
y
three of the fi rst four parameters are supplied, the missing
p
arameter ma
y
be found b
y
the followin
g
formula
.
S
am
p
le
S
electio
n
GI
V
EN
:
Select a water cooled chiller to cool 6
9
1 GPM of wate
r
e
ntering at 54°F and leaving at 44°F when supplied with 832 GPM
of condenser water entering at 85°F and leaving at 95°F leaving
.
So
luti
o
n
:
1.
Chilled water range (CWTD) = 54°F to 44°F = 10°
F
2.
Condenser water ran
g
e = 85°F to 95°F = 10°
F
3
.
Capacit
y
(tons) = (GPM x Chilled Water Range/24 =
69
1 x 10/24 = 288 tons
.
4
.
S
elect the closest” pro
j
ect tons” value from th
e
C
limaCoo
l
®
Q
uik Select
t
ables on
p
a
g
e 16 and 17 which meets
or exceeds the load of 288 tons. In this case, the closest match
is a Pro
j
ect Tons of “290”, delivering an actual capacit
y
of 293
tons. This selection comprises a total of (4) 65-ton modules
P
LU
S
(1) 30-ton module.
S
5
.
Eva
p
orator water
p
ressure dro
p
and condenser water
p
ressure
drop can be found on separate charts on page 13 of this manual.
If not provided, fl ow rates can be determined from the follow-
ing formulas
:
C
hilled Water GPM =
(Tons) x24
( )
Chilled Water delta T
(
°F
)
C
ondenser =
(Tons+ (0.285
( (
x Compressor kW))x24
p ))
Water
G
PM
C
ondenser Water delta T (°F
)
Once the GPM is determined, it can be divided b
y
the number of mod
-
ules (wei
g
hted accordin
g
to tonna
g
e) to establish GPM
p
er module
.
N
O
T
E
: Quik Selec
t
Tables (page 16 and 17) are based on a maxi-
t
mum allowable water fl ow rate of 1000 GPM through each of the 6”
main, water headers servin
g
chiller and condenser sections. This re-
sults in a maximum of fi ve FLEX 65 modules at the customar
y
10°F
Chilled Water Range, and 10°F Condenser Water Range. Additional
banks of modules can be selected for larger tonnage requirements.
A
lso, the maximum number of modules which can be controlled b
y
a
sin
g
le ClimaCom controller is seven. Additional controllers can
be selected for pro
j
ects requiring more than seven modules
.
C
HILLER PERF
O
RMAN
C
E WITH GLY
CO
L
S
W
hen analyzing performance data of chillers employing glycol
and water solutions, fi rst derive the chiller performance data
(CAPACITY, KW, GPM & PRESSURE DROP) assuming pure
water fl ow through the chiller. Then you can apply adjustment
factors to the performance data from the pure water case. These
factors are found in Fig. AM-1 through Fig. AM-4 on page 14,
and depend upon the t
y
pe and percent of
g
l
y
col used in the chille
r
c
ircuit. Fi
g
. AM-1 and Fi
g
. AM-2 provide factors for prop
y
lene
glycol. Fig. AM-3 and Fig. AM-4 are for ethylene glycol. The
factors in all Fig’s AM-1 through Fig. AM-4 are based on 10°F
drop in fl uid temperature throu
g
h the chillers and 8
5
°
F
enterin
g
c
ondenser water
(
ECDW
)
, and at 1
0
°
F rise throu
g
h the condense
r
(CDTD). Fig. AM-5 is provided for solution freeze temps. o
f
glycol concentrations. Fig. AM-6 provides ad
j
ustment factors for
c
hiller temp. drops other than 1
0
°
F
, all assuming a fouling facto
r
o
f 0
.
0001 in th
e c
hill
e
r
.
P
ro
py
lene Gl
y
col
S
election Exam
p
l
e
(
Select a FLEX 65 Module
)
Determine CAPACITY, KW, GPM and Pressure Dro
p
for a sin
g
le
FLEX 65 module, given the following Inputs
:
C
WTD = 10°F
L
C
WT = 4
2
°F
ECDW = 85°
F
C
DTD = 10°F
.
30% Prop
y
lene Gl
y
col/ 70% Water in Chille
r
1.
Assume a 10°F rise in the condenser, thus 95°F leaving con-
denser water
.
2.
From the Performance Data Table on page 18
:
CAPACITY: 63 TONS; KW: 46.
6
3.
First fi nd the chiller water fl ow and pressure drop for pure water
as in the
p
revious exam
p
le
.
GPM =
(
24
)(
63
)
/10 = 151.2 GPM
From page 13, bottom graph - right most curve, read pressure
drop from mid. Curve as
:
P
ressure drop = 7.0 ft. of wate
r
4
.
To convert
p
erformance data for
p
ure water to data usin
g
30%
P
rop
y
lene Gl
y
col, record the ad
j
ustment multipliers from Fig.
A
M-1 & Fig. AM-2 on page 14
:
CAPACITY factor
:
0.
97
KW factor
:
0.
988
GPM fact
o
r
:
1.0
22
P
ressure Drop factor
:
1.
20
5.
Calculate chiller performance using 30% Prop
y
lene Gl
y
col b
y
multipl
y
ing the chiller performance data for pure water b
y
the
ad
j
ustment factors as follows
:
CA
P
AC
ITY: 63 x 0.
9
7 = 61.1 TONS
KW
:
46.6 x 0.
9
88 = 46.04 KW
G
PM: 151.2 x 1.022 = 154.5
G
PM
P
ressure
D
ro
p
:
7
.0 x 1.20 = 8.4 ft. of wate
r
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®