Brochure dt XLe 1/2
Cooling Tower XL
With synthetic wet deck fill · Unit height 2050/2300 mm
This brochure is a completion to brochure dt 25e.
A DT-line cooling tower can be installed where the floor space is limited but the height is variable.
In application and mode of operation the dt XL doesn’t make a difference to its “little brother”.
Indeed its cooling capacity is 15 % higher than the cooling capacity of the standard tower.
Using our XL can sometimes render a leap to the next size superfluous, how the selection example
on page 4 shows.
The advantages of the
cooling tower XL are obvious:
He offers a higher cooling capacity
while maintaining the floor space.
Certainly he has a higher weight on the
same basal area but not inescapable a
higher total weight than the alternative.
The decision for a XL-equipment implies
cost saving because the size of the
tower will be reduced (f.e. the number
of cells). The standard accessories like
inlet- and outlet silencers, fan enclosure,
channels etc. fits the large tower, too.
However you have to consider the
higher noise level. We developed the
cooling tower XL to round off our standard of performance and to be able to
react more individual on problems like
cramped conditions etc.
“Technical specification” and “Installation and Operating Instructions”
from brochure dt 25e are essentially valid to the XL-line.
Calculation of the cooling capacity and temperature
For the selection of the XL towers you can use the quick selection tables, table 2 on pages 6 and 7/brochure dt 25e.
The cooling capacity of the DT XL are equivalent to those of brochure dt 25e plus approx. 15% (the cooling capacities of
the DT XL tower amounts to 115% of the standard tower DT).
For the choice of units with uncurrent temperatures you can enlist the kind of calculation like brochure dt 25e, page 13.
The nominal capacity and nominal water rate from brochure dt XLe 1 are to be placed in the calculation like page 13 of
brochure dt 25e.
The “Specification and the Installation and Operating Instructions” from brochure dt 25e essentially apply for the
XL-production.
Selection example
Given: Operating water flow rate
Water inlet temperature
Water outlet temperature
Wet-bulb temperature
mW
tWE
tWA
tF
=
=
=
=
65000 kg/h
+ 37 °C
+ 25 °C
+ 20 °C
With this brochure, an enlargement of our standard
program, we can offer an alternative which may avoid
– by considering the architectural conditions – the leap
to the next unit size. This advantage becomes apparent
especially when you are able to reduce the number of
the cells how the following example shows:
With the given conditions a calculation like that in
brochure dt 25 (our standard cooling tower) to get the
required cooling tower would look like this:
Result:
1 QB =
65000
3600
· 4,186 · (37–25) = 907 kW
2 k1 = 1,15 (selection curve for 12 K cooling range)
3 QN =
907 kW
1,15
= 789 kW
Step 1 to 3 look left
4 Unit selected: DT 82Z with QN act = 817 kW
5
operating water flow rate
nominal water flow rate of the unit
=
65000 kg/h
122195 kg/h
= 0,532
6 k 2 = 0,94 from selection curve 2
7 QN req. =
907 kW
1,15 · 0,94
= 839 kW
8 The selected unit is too small! New choice
and repeat with number 4.
4* New unit DT 77Z XL with QN act = 860 kW
4* New unit DT 2/45Z with QN req = 954 kW
5*
operating water flow rate
nominal water flow rate of the unit
=
65000 kg/h
142685 kg/h
6* k 2 = 0,9 from selection curve 2
7* QN req. =
907 kW
1,15 · 0,9
= 876 kW
8* Unit DT 2/45Z with QN act = 954 kW
9* and the permissible water flow rate between
34000 and 170000 kg/h is adequate.
= 0,455
5*
operating water flow rate
nominal water flow rate of the unit
=
65000 kg/h
111875 kg/h
= 0,581
6* k 2 = 0,96 from selection curve 2
7* QN req. =
907 kW
1,15 · 0,96
= 821 kW
8* Unit DT 77Z XL with QN act = 860 kW
9* and the permissible water flow rate between
23000 and 123000 kg/h is adequate, too and offers
you a real alternative, if f.e. the surface area is restricted.
The next unit size mustn’t be taken necessarily.
500/0110
Permanently Good Cooling
The manufactures reserve the right to make technical modifications
as a result of further development and technical advances.
E. W. Gohl GmbH | Pfaffenhäule 28 | D-78224 Singen | Tel. 0 77 31 . 88 06 - 0 | Fax 0 77 31 . 88 06 -99 | [email protected] | www.gohl.de
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5,5
7,4
5,2
7,3
10,0
3,4
5,2
7,5
10,5
13,8
2x5,5
2x7,4
2x5,2
2x7,3
2x10,0
2x3,4
2x5,2
2x7,5
2x10,5
2x13,8
3x5,5
3x7,4
3x5,2
3x7,3
3x10,0
3x3,4
3x5,2
3x7,5
3x10,5
3x13,8
4x5,5
4x7,4
4x5,2
4x7,3
4x10,0
4x3,4
4x5,2
4x7,5
4x10,5
4x13,8
5x5,5
5x7,4
5x5,2
5x7,3
5x10,0
5x3,4
5x5,2
5x7,5
5x10,5
5x13,8
6x5,5
6x7,4
6x5,2
6x7,3
6x10,0
6x3,4
6x5,2
6x7,5
6x10,5
6x13,8
7,5
11,0
7,5
11,0
11,0
4,0
7,5
11,0
15,0
15,0
15,0
18,5
11,0
18,5
22,0
7,5
11,0
18,5
22,0
30,0
18,5
30,0
18,5
30,0
37,0
11,0
18,5
30,0
37,0
45,0
2x15,0
2x18,5
2x11,0
2x18,5
2x22,0
2x7,5
2x11,0
2x18,5
2x22,0
2x30,0
15,0+18,5
18,5+30,0
11,0+18,5
18,5+30,0
22,0+37,0
7,5+11,0
11,0+18,5
18,5+30,0
22,0+37,0
30,0+45,0
2x18,5
2x30,0
2x18,5
2x30,0
2x37,0
2x11,0
2x18,5
2x30,0
2x37,0
2x45,0
70
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73
76
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73
75
72
75
72
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78
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77
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77
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80
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78
75
78
75
78
81
68
72
74
76
78
75
78
75
78
81
69
73
75
77
79
6,0
7,8
5,6
7,8
10,7
3,9
5,8
8,2
11,2
14,7
2x6,0
2x7,8
2x5,6
2x7,8
2x10,7
2x3,9
2x5,8
2x8,2
2x11,2
2x14,7
3x6,0
3x7,8
3x5,6
3x7,8
3x10,7
3x3,9
3x5,8
3x8,2
3x11,2
3x14,7
4x6,0
4x7,8
4x5,6
4x7,8
4x10,7
4x3,9
4x5,8
4x8,2
4x11,2
4x14,7
5x6,0
5x7,8
5x5,6
5x7,8
5x10,7
5x3,9
5x5,8
5x8,2
5x11,2
5x14,7
6x6,0
6x7,8
6x5,6
6x7,8
6x10,7
6x3,9
6x5,8
6x8,2
6x11,2
6x14,7
kW
7,5
11,0
7,5
11,0
15,0
5,5
7,5
11,0
15,0
18,5
15,0
18,5
15,0
18,5
30,0
11,0
15,0
18,5
30,0
37,0
22,0
30,0
18,5
30,0
37,0
15,0
18,5
30,0
37,0
45,0
2x15,0
2x18,5
2x15,0
2x18,5
2x30,0
2x11,0
2x15,0
2x18,5
2x30,0
2x37,0
15,0+22,0
18,5+30,0
15,0+18,5
18,5+30,0
30,0+37,0
11,0+15,0
15,0+18,5
18,5+30,0
30,0+37,0
37,0+45,0
2x22,0
2x30,0
2x18,5
2x30,0
2x37,0
2x15,0
2x18,5
2x30,0
2x37,0
2x45,0
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81
70
73
75
78
80
6,7
8,3
6,1
8,5
11,5
4,5
6,3
8,9
12,1
16,2
2x6,7
2x8,3
2x6,1
2x8,5
2x11,5
2x4,5
2x6,3
2x8,9
2x12,1
2x16,2
3x6,7
3x8,3
3x6,1
3x8,5
3x11,5
3x4,5
3x6,3
3x8,9
3x12,1
3x16,2
4x6,7
4x8,3
4x6,1
4x8,5
4x11,5
4x4,5
4x6,3
4x8,9
4x12,1
4x16,2
5x6,7
5x8,3
5x6,1
5x8,5
5x11,5
5x4,5
5x6,3
5x8,9
5x12,1
5x16,2
6x6,7
6x8,3
6x6,1
6x8,5
6x11,5
6x4,5
6x6,3
6x8,9
6x12,1
6x16,2
Permissible water
flow rate
Overall dimensions
(with water connections the
units are 60 mm longer)
maximal
minimal
Length
Width
Height
kW
dB(A)
kg/h
kg/h
mm
mm
7,5
11,0
7,5
11,0
15,0
5,5
7,5
11,0
15,0
18,5
15,0
18,5
15,0
18,5
30,0
11,0
15,0
22,0
30,0
37,0
22,0
30,0
22,0
30,0
37,0
15,0
22,0
30,0
45,0
18,5+37,0
2x15,0
2x18,5
2x15,0
2x18,5
2x30,0
2x11,0
2x15,0
2x22,0
2x30,0
2x37,0
15,0+22,0
18,5+30,0
15,0+22,0
18,5+30,0
30,0+37,0
11,0+15,0
15,0+22,0
22,0+30,0
30,0+45,0
2x37,0+18,5
2x22,0
2x30,0
2x22,0
2x30,0
2x37,0
2x15,0
2x22,0
2x30,0
2x45,0
3x37,0
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70
72
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80
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80
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78
80
77
80
77
79
82
70
73
75
78
80
77
80
77
79
82
71
74
76
79
81
85000
85000
100000
100000
100000
123000
123000
123000
123000
123000
170000
170000
200000
200000
200000
246000
246000
246000
246000
246000
255000
255000
300000
300000
300000
369000
369000
369000
369000
369000
340000
340000
400000
400000
400000
492000
492000
492000
492000
492000
425000
425000
500000
500000
500000
615000
615000
615000
615000
615000
510000
510000
600000
600000
600000
738000
738000
738000
738000
738000
17000
17000
20000
20000
20000
23000
23000
23000
23000
23000
34000
34000
40000
40000
40000
46000
46000
46000
46000
46000
51000
51000
60000
60000
60000
69000
69000
69000
69000
69000
68000
68000
80000
80000
80000
92000
92000
92000
92000
92000
85000
85000
100000
100000
100000
115000
115000
115000
115000
115000
102000
102000
120000
120000
120000
138000
138000
138000
138000
138000
3843
3843
4266
4266
4266
5216
5216
5216
5216
5216
3843
3843
4266
4266
4266
5216
5216
5216
5216
5216
3843
3843
4266
4266
4266
5216
5216
5216
5216
5216
3843
3843
4266
4266
4266
5216
5216
5216
5216
5216
3843
3843
4266
4266
4266
5216
5216
5216
5216
5216
3843
3843
4266
4266
4266
5216
5216
5216
5216
5216
1256
1256
1256
1256
1256
1256
1256
1256
1256
1256
2429
2429
2429
2429
2429
2429
2429
2429
2429
2429
3602
3602
3602
3602
3602
3602
3602
3602
3602
3602
4775
4775
4775
4775
4775
4775
4775
4775
4775
4775
5948
5948
5948
5948
5948
5948
5948
5948
5948
5948
7121
7121
7121
7121
7121
7121
7121
7121
7121
7121
The cooling capacities are guaranteed according to DIN 1947. At the spray tree inlet of the unit, there must be a water pressure of 0,5 bar. The full cooling capacity will only be achieved
after some days of operation, when the wet deck fill has been fully wetted. Cooling capacities when using two-speed motors:
In changing speed from 1500 r.p.m. to 750 r.p.m. the cooling capacity drops to about 55 %. If the cooling tower fan is switched off, the cooling capacity will only be about 15 %.
sound pressure level at 3 m
5,5
7,5
5,5
7,5
11,0
4,0
5,5
7,5
11,0
15,0
11,0
15,0
11,0
15,0
22,0
7,5
11,0
15,0
22,0
30,0
18,5
22,0
15,0
22,0
30,0
11,0
15,0
22,0
30,0
45,0
2x11,0
2x15,0
2x11,0
2x15,0
2x22,0
2x7,5
2x11,0
2x15,0
2x22,0
2x30,0
11,0+18,5
15,0+22,0
11,0+15,0
15,0+22,0
22,0+30,0
7,5+11,0
11,0+15,0
15,0+22,0
22,0+30,0
30,0+45,0
2x18,5
2x22,0
2x15,0
2x22,0
2x30,0
2x11,0
2x15,0
2x22,0
2x30,0
2x45,0
kW
(1500 min-1)
5,0
6,9
4,7
6,8
9,3
3,0
4,6
6,8
9,6
13,1
2x5,0
2x6,9
2x4,7
2x6,8
2x9,3
2x3,0
2x4,6
2x6,8
2x9,6
2x13,1
3x5,0
3x6,9
3x4,7
3x6,8
3x9,3
3x3,0
3x4,6
3x6,8
3x9,6
3x13,1
4x5,0
4x6,9
4x4,7
4x6,8
4x9,3
4x3,0
4x4,6
4x6,8
4x9,6
4x13,1
5x5,0
5x6,9
5x4,7
5x6,8
5x9,3
5x3,0
5x4,6
5x6,8
5x9,6
5x13,1
6x5,0
6x6,9
6x4,7
6x6,8
6x9,3
6x3,0
6x4,6
6x6,8
6x9,6
6x13,1
kW
E-Motor
30000
34000
30000
35000
40000
30000
36000
42000
48000
54000
60000
68000
60000
70000
80000
60000
72000
84000
96000
108000
90000
102000
90000
105000
120000
90000
108000
126000
144000
162000
120000
136000
120000
140000
160000
120000
144000
168000
192000
216000
150000
170000
150000
175000
200000
150000
180000
210000
240000
270000
180000
204000
180000
210000
240000
180000
216000
252000
288000
324000
kW
(1500 min-1)
71343
78073
75830
83457
91534
80915
91983
102153
111875
122195
142685
156146
151659
166915
183068
161830
183965
204306
223750
244390
214028
234219
227489
250372
274602
242744
275948
306459
335624
366584
285370
312292
303318
333830
366136
323659
367930
408612
447499
488779
356713
390365
379148
417287
457670
404574
459913
510765
559374
610974
428056
468438
454977
500744
549203
485489
551896
612918
671249
733169
kW
dB(A)
E-Motor
549
600
583
642
704
622
707
785
860
940
1097
1201
1166
1283
1408
1244
1415
1571
1720
1879
1646
1801
1749
1925
2111
1866
2122
2356
2581
2819
2194
2401
2332
2567
2815
2489
2829
3142
3441
3758
2743
3002
2915
3209
3519
3111
3536
3927
4301
4698
3291
3602
3498
3850
4223
3733
4244
4713
5161
5637
kW
(1500 min-1)
kW
dB(A)
E-Motor
m /h
dB(A)
(1500 min-1)
kg/h
3
E-Motor
kW
absorbed power
GN
absorbed power
6
QN
130 to 180 Pa
sound pressure level at 3 m
5
Nominal
water
flow rate
absorbed power
4
Nominal
cooling
capacity
sound pressure level at 3 m
3
Air
volume
Centrifugal fan selected for an external pressure of:
0 to 40 Pa
40 to 80 Pa
80 to 130 Pa
absorbed power
2
45 Z XL
50 Z XL
52 Z XL
58 Z XL
63 Z XL
57 Z XL
64 Z XL
70 Z XL
77 Z XL
82 Z XL
2/45 Z XL
2/50 Z XL
2/52 Z XL
2/58 Z XL
2/63 Z XL
2/57 Z XL
2/64 Z XL
2/70 Z XL
2/77 Z XL
2/82 Z XL
3/45 Z XL
3/50 Z XL
3/52 Z XL
3/58 Z XL
3/63 Z XL
3/57 Z XL
3/64 Z XL
3/70 Z XL
3/77 Z XL
3/82 Z XL
4/45 Z XL
4/50 Z XL
4/52 Z XL
4/58 Z XL
4/63 Z XL
4/57 Z XL
4/64 Z XL
4/70 Z XL
4/77 Z XL
4/82 Z XL
5/45 Z XL
5/50 Z XL
5/52 Z XL
5/58 Z XL
5/63 Z XL
5/57 Z XL
5/64 Z XL
5/70 Z XL
5/77 Z XL
5/82 Z XL
6/45 Z XL
6/50 Z XL
6/52 Z XL
6/58 Z XL
6/63 Z XL
6/57 Z XL
6/64 Z XL
6/70 Z XL
6/77 Z XL
6/82 Z XL
Technical Data
sound pressure level at 3 m
1
Unit size
Number of fans
Table 1
Weight
empty weight ~
shipping weight
operating weight
water level = 230 mm
max. weight
water level up to overflow
Heaviest and largest section
when delivered
broken down (fan)
Operating
weight
mm
max.
weight
mm
Weight
Length
Width
Height
mm
Empty
weight
mm
kg
mm
mm
mm
2050
2050
2050
2050
2050
2300
2300
2300
2300
2300
2050
2050
2050
2050
2050
2300
2300
2300
2300
2300
2050
2050
2050
2050
2050
2300
2300
2300
2300
2300
2050
2050
2050
2050
2050
2300
2300
2300
2300
2300
2050
2050
2050
2050
2050
2300
2300
2300
2300
2300
2050
2050
2050
2050
2050
2300
2300
2300
2300
2300
910
910
1010
1010
1010
1310
1310
1310
1310
1310
1630
1630
1920
1920
1920
2290
2290
2290
2290
2290
2350
2350
2580
2580
2580
3270
3270
3270
3270
3270
3080
3080
3390
3390
3390
4350
4350
4350
4350
4350
3810
3810
4200
4200
4200
5320
5320
5320
5320
5320
4540
4540
5010
5010
5010
6290
6290
6290
6290
6290
1520
1520
1730
1730
1730
2230
2230
2230
2230
2230
2850
2850
3250
3250
3250
4140
4140
4140
4140
4140
4180
4180
4740
4740
4740
6040
6040
6040
6040
6040
5510
5510
6270
6270
6270
8040
8040
8040
8040
8040
6850
6850
7810
7810
7810
9940
9940
9940
9940
9940
8190
8190
9340
9340
9340
11830
11830
11830
11830
11830
1750
1750
2000
2000
2000
2780
2780
2780
2780
2780
3390
3390
4000
4000
4000
5360
5360
5360
5360
5360
4980
4980
5700
5700
5700
7870
7870
7870
7870
7870
6590
6590
7550
7550
7550
10480
10480
10480
10480
10480
8200
8200
9410
9410
9410
12980
12980
12980
12980
12980
9810
9810
11260
11260
11260
15490
15490
15490
15490
15490
145
145
145
145
145
200
200
200
200
200
970
970
970
970
970
1150
1150
1150
1150
1150
1000 (835)
1000 (835)
1000 (835)
1000 (835)
1000 (835)
1070 (880)
1070 (880)
1070 (880)
1070 (880)
1070 (880)
1200
1200
1200
1200
1200
1420
1420
1420
1420
1420
The following data
are essential for
the selection of
a cooling tower:
1 water inlet
temperature
2 water outlet
temperature
3 water flow rate
4 wet-bulb
temperature
Weight and dimensions of the
heaviest and largest part
when delivered broken down
can be obtained from
the table for single cell units
with one fan.
Dimensional tolerance
according to ISO 2768-v.
Sound pressure level: The indicated values in dB(A) relate to a measurement of 3 m in horizontal extension of the fan shaft (maximum noise
development). Although the forward-curved fan impellers of the large units, with centrifugal fans, are manufactured by a reputable company and designed
for particularly low-noise level at high efficiency, the dB(A) ratings must be regarded as guide values because the installation conditions
of cooling towers vary widely. Permissible tolerance +/- 2 dB.
5 plane of the
available
space for the
installation
Please note
our special
Technical Reports!