Keeprite KDF Installation Manual
PRODUCT DATA &
INSTALLATION
Bulletin K60-KDF-PDI-10
1064436
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KDF Direct Drive
Dry Type
Fluid Coolers
Air Cooled Models from 200 MBH
to 2,000 MBH
One to Six fan Units Glycol Selection Data
• Heavy gauge galvanized steel casing with zinc
plated nuts and bolts
• Die-formed legs
• High efficiency coils with rippled aluminum fins
hydraulically bonded to copper tubing.
NOMENCLATURE
KDF A 1 075 D 2 A T
KEEPRITE
DIRECT DRIVE
FLUID COOLER
GENERA TION
NUMBER OF FANS
PRODUCT OF ROW DEPTH
AND SQ. FT . OF F ACE AREA
EG. 5 ROW DEEP x 15.0
SQ. FT. = MODEL No. 075
ELECTRICAL DESIGNA TION
D = 208-230/1/60
F = 208-230/3/60
K = 460/3/60
L = 575/3/60
CONTROL OPTIONS
0 TO 6
CONNECTION OPTIONS
A TO D (BLANK SIGNIFIES NO FLANGES)
• Four-bladed heavy gauge rust resistant aluminum
fans with steel spider and hub.
• Direct drive fan motors with inherent overload
protection.
• Motors are weather protected by top end rain
shields and shaft moisture slingers.
CONTENTS PAGE
Nomenclature.........................................
Capacity Data.........................................
Selection Data Notes............................
Sample Selection..................................
Dimensional Data..................................
Installation Instructions........................
Design Specifications...........................
Service Log............................................
Project Information...............................
Cover
2
2
3, 4, 5
6
7, 8
Back
Back
Back
TEAC MOTOR
CAPACITY DATA
M.B.H. / SQ. FT. COIL FACE AREA
Table 1
Approach INITIAL TEMPERATURE DIFFERENCE (I.T.D.)
20°F
25°F
30°F
35°F
40°F
45°F
50°F
55°F
60°F
65°F
11.6
14.1
15.7
17.2
18.4
19.4
20.3
21.2
21.9
23.2
70°F
(39°C)
12.3
15.0
16.6
18.3
19.4
20.5
21.5
22.4
23.2
23.9
24.5
25.0
(42°C)
°F °C
5
10
15
20
11
25
14
30
17
35
19
40
22
45
25
50
28
55
30
60
33
65
36
70
39
75
42
80
44
85
47
90
50
(11°C)
(14°C)
(17°C)
(19°C)
(22°C)
(25°C)
(28°C)
(30°C)
(33°C)
(36°C)
3
4.9
5.7
6.6
7.5
8.1
8.8
9.5
10.2
10.9
6
6.1
7.0
8.0
8.9
9.9
10.8
11.7
12.5
13.3
8
8.0
9.1
10.0
9.9 11.0
11.7
11.2
12.1
13.0
13.7
12.1
13.1
13.1
14.1
14.0
15.0
14.8
16.0
15.5 16.7
17.5
14.0
15.1
16.2
17.2
17.9
18.7
19.3
14.9
16.2
17.4
18.4
19.2
20.0
20.6
21.2 22.5
75°F
80°F
(44°C)
13.1
13.9
15.7
16.4
17.5
18.5
19.1
20.0
20.4
21.4
21.5
22.7
22.6
23.7
23.5
24.6
24.3
25.4
25.0
26.2
25.7
27.0
26.2
27.5
27.0 28.1
28.7
85°F
(47°C)
14.5
17.2
19.3
20.8
22.9
23.5
24.7
25.6
26.5
27.3
28.1
28.7
29.4
30.0
30.7
90°F
95°F
(50°C)
(53°C)
15.2
18.1
20.2
21.8
23.3
24.5
25.6
26.6
27.6
28.5
29.3
30.0
30.7
31.4
32.0
32.6 33.9
15.9
18.8
20.9
22.6
24.1
25.4
26.6
27.7
28.6
29.5
30.4
31.1
31.8
32.5
33.2
34.6
100°F
(55°C)
16.7
19.6
21.7
23.5
25.0
26.4
27.5
28.5
29.5
30.5
31.4
32.3
33.0
33.7
34.4
35.1
35.8
36.5
COIL FACE AREA
Table 1A
Model KDF 1052 1060 2100 2120 3152 3180 4200 4240 6300 6360
Coil
Face
Area
Fan
Data
Data shown covers 10 models. 10 additional models available. Consult your local KeepRite Refrigeration Sales Office.
1. Temperature Limitations
2. Elevation Adjustment
3. Ratings
Sq. Ft. 12.5 15.0 25.0 30.0 37.5 45.0 50.0 60.0 75.0 90.0
2
m
1.16 1.39 2.32 2.79 3.48 4.18 4.65 5.57 6.97 9.36
No. 1 1 2 2 3 3 4 4 6 6
Total CFM 7050 7380 14100 14760 21150 22140 28200 29520 42300 44280
Total m3/s 3.33 3.48 6.65 6.97 9.98 10.45 13.31 13.93 19.96 20.9
KeepRite fluid coolers are suitable for leaving air
temperatures up to a maximum of 130°F (54°C).
Fluid temperature up to an average of 150°F (66°C)
selection programme is available. Interpolation of
capacities shown in Table 1 is permitted. Do not
extrapolate.
may be used at ambient temperatures up to 90°F
(32°C). Entering fluid conditions should however not
exceed 200°F (93°C).
4. Fluid Velocities
Fluid velocities are adjusted in accordance with the
average temperature and the glycol mixtures used.
Where a selected unit has a coil face area larger or
Capacities are suitable for elevations up to 2000 ft.
Above 2000 ft. and up to 3000 ft. elevation, unit
capacities shown in Table 1 must be corrected by
.90 before selecting unit.
smaller than the actual size required, the basic
fluid velocity must be adjusted (see example).
5. Low Flow Rates
Where flow rate is low (approx. 1 0 USGPM or
lower), standard circuiting may not provide the
necessary tube velocity. Contact Head Office for
Ratings are based on a standard heat transfer rate
special circuiting.
and fluid velocity is varied to suit. Ratings and
selections will be conservative. For additional fluid
cooler models and more detailed analysis and
selections, the KeepRite fluid cooler computer
6. KeepRite selection sheets are available for
assisting in the selection and recording of data.
Contact your local KeepRite Sales Office for
copies.
- 2 -
SAMPLE SELECTION
Example
Required:
A computer room application requires a KDF fluid cooler
to handle a load of 50 USGPM of 50% Ethylene Glycol.
(By wt.) from 115°F (46°C) to 105°F (40°C) at 95°F
(35°C) Ambient. Unit located at sea level.
Selection Method
(1) Find the Total BTU/hr. Requirements (Q)
BTU/hr. = USGPM x fluid T.D. x Factor “N” (Table 2)
= 50 x 10 x 434
= 217,000 BTU/hr. (63 kw)
(2) Find minimum CFM required
CFM =
=
1.09 x 35
1.09 x (130°F - Amb. Temp. °F.)
217,000
(3) Find initial temperature difference and approach
I.T.D.: = Ent, fluid temperature minus entering
ambient air temperature
= 115° - 95°F
= 20°F(11°C)
Approach: = Leaving fluid temperature minus
entering ambient temperature
= 105° - 95°F
= 10°F (6°C)
(4) Find MBH Capacity per sq. foot of fluid cooler
surface
For an ITD of 20°F (11°C) and an approach of 10°F
(6°C) read from Table 1 a unit capacity of 6.1MBH/
sq. ft. of coil surface area. As this application is at
sea level no correction is necessary.
(5) Determine total area of coil surface required
Coil surface, sq. ft.
= Total BTU/hr. (Q) (Step 1)
MBH/sq. ft. (Step 4) x 1000
217,000
=
6100
= 35.6 sq. ft.
(6) Select Unit
From Table 1A select a unit size having a coil
face area equal to or larger than 35.6 sq. ft. A
Model 3152 has a face area of 37.5 sq. ft. This
selection would be suitable.
(Q) BTU/hr
= 5688 CFM
(NOTE. When unit selected has a face area larger or
smaller than that required in step (5), basic fluid
velocity should be adjusted using velocity correction
factor from Table 4.
For this example, the required coil face area is
35.6 sq. ft. (5 above). Actual coil face area is 37.5 sq. ft.
Ratio oversize =
35.6
37.5
= 1.05
From Table 4 the velocity correction factor is .95.
This is applied to the basic velocity to obtain th required
minimum velocity:
.95 x 3.1 = 2.9 ft./sec.
(9) Circulting requirements
Refer to Chart 1 at 50 G.P.M., Type.30 circuiting will
provide a velocity of 2.83 ft./sec. This is close to the
required minimum velocity of 2.9 ft./sec. and may be
used. (See note 2 Chart 1 for minimum velocity range).
(10) Determining Fluid Pressure Drop
Knowing the circuiting to be used, the fluid pressure
drop can be determined as follows:
(a) Find the Total Equivalent Length of tube circuit
from Table 5. For a model KDF 3152, using type
30 circuiting, the T.E.L. is 51 feet.
(b) From Table 6, note the pressure drop under 50%
solution at 2.9 ft./sec. as 060 P.S. 1. per foot of
equivalent length.
(c) Total pressure drop, P.S.I. = Pressure drop per
foot (b) multiplied by 51 feet T.E.L. (a) plus
standard allowance of 2 P.S. I. for headers:
.060 x 51 = 3.06 P. S. I.
Headers = 2.00 P. S. I.
5.06 P. S. 1.
Apply temperature correction factor from Table 7
= .9 7 x 5.06 = 4.90 P. S. I.
(11) Final Selection
1 - KeepRite KDF fluid cooler model 3152 using type 30
circuiting, having a fluid pressure drop of 4.90 P.S.I.
connections will be same end (Table 5).
Headers and connection sizes will be 2 1/8" O.D.
(Table 8).
(7) Check air quantity
A Model 3152 is rated at 21150 CFM. This
exceeds the minimum of 5688 CFM (step 2) and
is satisfactory. (See Table 1A for CFM
capacities).
(8) Determine minimum fluid velocity required
From Table 3 for a 50% glycol solution at an
average temperature of 110°F (43°C), the
required basic velocity is 3.1 ft./second.
- 3 -
“N” FACTORS
Table 2
AVE. FACTOR "N"
FLUID % GLYCOL SOLUTION
TEMP. 30% 40% 50% 60%
50 466 437 420 394
70 467 442 426 400
100 469 446 432 408
120 470 448 436 411
130 470 450 438 414
140 470 452 439 416
150 470 452 440 418
250
200
Chart 1
TUBE CIRCUITING
BASIC
FLUID VELOCITY
Table 3
AV.
FLUID
TEMP°
50 2.9 3.7 4.6 5.8
70 2.5 3.1 3.9 5.0
100 2.0 2.6 3.2 4.2
110 2.0 2.5 3.1 4.0
120 2.0 2.4 3.0 3.8
130 2.0 2.3 2.8 3.6
140 2.0 2.2 2.7 3.4
150 2.0 2.0 2.6 3.3
GLYCOL
SOLUTION %
30 40 50 60
150
100
U.S. GALLONS / MINUTE
50
1 2 3 4 5 6
NOTES: 1. For more accurate readings use the following formula
Fluid VEL Ft./sec. =
2. When selecting circuiting, the velocity obtained can be lower than the desired velocity by not
more than 5%. A greater difference will require an alternate circuit type to be selected.
Velocities higher than the desired velocity are acceptable.
GPM x 1.70
Circuit Type
COIL AREA
RATIO
.85 1.30
.90 1.20
.95 1.10
1.00 1.00
1.10 .90
1.20 .80
1.30 and
over
* When VEL correction factor is
applied to basic fluid velocity
maximum velocity should not
exceed 6 ft./sec. Minimum should
not exceed 2 ft./sec.
VEL.* CORR.
FACTOR
.70
LENGTH OF TUBE CIRCUIT
Table 5
Table 4
Circuit
† 1052-3180 - Opposite End 4200-6360 - Same End
Header
Location
120 SE NA NA NA NA NA NA NA NA NA NA NA NA 20 6.10 23 7.02 27 8.24 31 9.46
80 OE NA NA NA NA NA NA NA NA NA NA NA NA 29 8.85 33 10.07 39 11.90 44 13.42
60 SE 14 4.27 15 4.58 20 6.10 23 7.02 27 8.24 31 9.46 38 11.59 42 12.81 51 15.56 58 17.69
48 OE NA NA NA NA NA NA NA NA NA NA NA NA 46 14.03 52 15.86 63 19.22 72 21.96
40 † 19 5.80 21 6.41 29 8.85 33 10.07 39 11.90 44 13.42 55 16.78 62 18.91 75 22.88 86 26.23
30 SE 24 7.32 27 8.24 38 11.59 42 12.81 51 15.56 58 17.69 72 21.96 82 25.01 99 30.20 113 34.47
24 † 30 9.15 33 10.07 46 14.03 52 15.86 63 19.22 72 21.96 90 27.45 101 30.81 123 37.52 141 43.01
20 SE 37 11.29 39 11.90 55 16.78 62 18.91 75 22.88 86 26.23 107 32.64 121 36.91 147 44.84 168 51.24
15 SE 46 14.03 50 15.25 72 21.96 82 25.01 99 30.20 113 34.47 142 43.31 160 48.80 195 59.48 223 68.02
10 SE 67 20.44 74 22.57 107 32.64 121 36.91 147 44.84 168 51.24 211 64.36 239 72.90 291 88.76 333 101.57
5 SE 131 39.95 145 44.23 211 64.36 239 72.90 291 88.76 333 101.57 419 127.80 475 144.88 579 176.60 663 202.22
1052 1060 2100 2120 3152 3180 4200 4240 6300 6360
FT. M FT. M FT. M FT. M FT. M FT. M FT. M FT. M FT. M FT. M
EQUIVILANT LENGTH OF TUBE CIRCUIT
- 4 -
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