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Evapco ATW, LSWA Series Cooling Towers

Mechanical-draft cooling towers are intended for water cooling in closed-circuit water circulation systems for energy-consuming equipment. Application of closed-circuit water circulation systems based on compact, mechanical-draft cooling towers allows to considerably decrease water consumption in the system. Energy and water saving effects lead to the reduction of final product cost. The payback time for water circulation systems with compact mechanical-draft cooling towers in Russia varies from 2 to 6 months depending on the region.


Detailed description of ATW induced-draft axial fan cooling towers and LSWA forced-draft centrifugal fan cooling towers are provided below.


Тип ATW, 134 - 11051 кВт

Counterflow closed circuit cooler with axial fans and patented Thermal-Pak® heat exchanger.


The standard cooler design incorporates a corrosion protection system including the following: sump, shell and fan section made of Z-725 galvanized high-quality steel, and water distributors, drift eliminators and inlet louvers of PVC material.


Operating Principle of ATW-type Closed Circuit Cooler


The cooled fluid circulates through heat-exchange coils in the closed circuit cooler. The heat emitted by the cooled fluid is transferred to the water in the external circuit that cascades into the shell side of the heat exchanger. In the meantime, atmospheric air enters the cooler through air intake louvers and flows against the descending water stream. The warm humid air is drawn into the cooler by the axial fan located in its upper part and, after passing through the fan, released into the atmosphere. Water in the external circuit flows through the shell side of the heat exchanger into the cooling sump located in the lower part of the cooler. Water circulation in the external circuit is maintained by centrifugal pump. The centrifugal pump delivers water to the spray nozzles located above the upper sections of heat-exchange coils of the internal fluid circuit.


Technical data for the following ATW type cooler models are provided in the table below:

Sl. No Type, Model Weight, kg Overall dimensions, mm Fan motor Spray pump motor
shipping working Length (A) Width (B) Height (H) Power, kW Power, kW
1 ATW 96-5K 5 942 8 954 3 651 2 388 3 800 15,0 2,20
2 ATW 96-6K 6 700 9 975 3 651 2 388 3 991 15,0 2,20
3 ATW 96-6L 6 713 9 988 3 651 2 388 3 991 18,5 2,20
4 ATW 112-4K 5 915 9 117 4 261 2 388 3 721 15,0 2,20
5 ATW 112-5K 6 750 10 256 4 261 2 388 3 912 15,0 2,20
6 ATW 112-6K 7 625 11 435 4 261 2 388 4 102 15,0 2,20
7 ATW 112-4L 5 929 9 131 4 261 2 388 3 721 18,5 2,20
8 ATW 112-5L 6 763 10 270 4 261 2 388 3 912 18,5 2,20
9 ATW 112-6L 7 639 11 449 4 261 2 388 4 102 18,5 2,20
10 ATW 112-6M 7 648 11 458 4 261 2 388 4 102 22,0 2,20
11 ATW 96-5K-2 * 5 942 8 954 3 651 2 388 3 800 15,0 2,20
12 ATW 96-6K-2 * 6 700 9 975 3 651 2 388 3 991 15,0 2,20
13 ATW 96-6L-2 * 6 713 9 988 3 651 2 388 3 991 18,5 2,20
14 ATW 112-4K-2 * 5 915 9 117 4 261 2 388 3 721 15,0 2,20
15 ATW 112-5K-2 * 6 750 10 256 4 261 2 388 3 912 15,0 2,20
16 ATW 112-6K-2 * 7 625 11 435 4 261 2 388 4 102 15,0 2,20
17 ATW 112-4L-2 * 5 929 9 131 4 261 2 388 3 721 18,5 2,20
18 ATW 112-5L-2 * 6 763 10 270 4 261 2 388 3 912 18,5 2,20
19 ATW 112-6L-2 * 7 639 11 449 4 261 2 388 4 102 18,5 2,20
20 ATW 112-6M-2 * 7 648 11 458 4 261 2 388 4 102 22,0 2,20

* - Heat exchange sections are connected in series.


"Dry" cooler performance data (without water spray); Dry bulb = 10C water;

Sl. No Type, Model Inlet fluid temperature, 0С Outlet fluid temperature, 0С Circulating water flow through cooler G, m3/hr Heat output Q. kW
1 ATW 96-5K 40 29,4 39,0 477,0
2 ATW 96-6K 40 29,4 44,3 542,3
3 ATW 96-6L 40 29,4 45,0 552,0
4 ATW 112-4K 40 29,4 38,0 467,5
5 ATW 112-5K 40 29,4 45,1 553,0
6 ATW 112-6K 40 29,4 51,2 627,0
7 ATW 112-4L 40 29,4 38,6 473,0
8 ATW 112-5L 40 29,4 45,8 561,3
9 ATW 112-6L 40 29,4 52,0 638,0
10 ATW 112-6M 40 29,4 52,8 646,7
11 ATW 96-5K-2 * 40 29,4 39,0 477,0
12 ATW 96-6K-2 * 40 29,4 44,3 542,3
13 ATW 96-6L-2 * 40 29,4 45,0 552,0
14 ATW 112-4K-2 * 40 29,4 38,0 467,5
15 ATW 112-5K-2 * 40 29,4 45,1 553,0
16 ATW 112-6K-2 * 40 29,4 51,2 627,0
17 ATW 112-4L-2 * 40 29,4 38,6 473,0
18 ATW 112-5L-2 * 40 29,4 45,8 561,3
19 ATW 112-6L-2 * 40 29,4 52,0 638,0
20 ATW 112-6M-2 * 40 29,4 52,8 646,7

* - Heat exchange sections are connected in series.



LSWA Type, 73 - 4103 kW


Counterflow closed circuit cooler with centrifugal fans and patented Thermal-Pak® heat exchanger.


The standard cooler design incorporates a corrosion protection system including the following: sump, shell and fan section made of Z-725 galvanized high-quality steel, and water distributors, drift eliminators and inlet louvers of PVC material.

Operating Principle of LSWA-type Closed Circuit Cooler


The cooled fluid circulates through heat-exchange coils in the closed circuit cooler. The heat emitted by the cooled fluid is transferred to the water in the external circuit that cascades into the shell side of the heat exchanger. In the meantime, atmospheric air entering through air intake louvers is forced into the cooler by the centrifugal fan and flows against the descending water stream. The warm humid air passes through the drift eliminator and is discharged into the atmosphere. Water in the external circuit flows through the shell side of the heat exchanger into the cooling sump located in the lower part of the cooler. Water circulation in the external circuit is maintained by centrifugal pump. The centrifugal pump delivers water to the spray nozzles located above the upper sections of heat-exchange coils of the internal fluid circuit.


Sl. No Type, Model Weight, kg Overall dimensions, mm Fan motor Spray pump motor
shipping working Length (A) Width (B) Height (H) Power, kW Power, kW
1 LSWA 135A 7 026 10 936 5 490 2 388 3 353 30,0 5,50
2 LSWA 135B 8 224 12 569 5 490 2 388 3 543 30,0 5,50
3 LSWA 135C 9 399 14 175 5 490 2 388 3 734 37,0 5,50
4 LSWA 135D 10 573 15 781 5 490 2 388 3 924 37,0 5,50
5 LSWA 135A-2 7 026 10 936 5 490 2 388 3 353 30,0 5,50
6 LSWA 135B-2 8 224 12 569 5 490 2 388 3 543 30,0 5,50
7 LSWA 135C-2 9 399 14 175 5 490 2 388 3 734 37,0 5,50
8 LSWA 135D-2 10 573 15 781 5 490 2 388 3 924 37,0 5,50

"Dry" cooler performance data (without water spray); Dry bulb = 10C; water

Sl. No Type, Model Inlet fluid temperature, 0С Outlet fluid temperature,, 0С Circulating water flow through cooler G, m3/hr Heat output Q. kW
1 LSWA 135A 40 29,4 38,5 473,2
2 LSWA 135B 40 29,4 48,6 597,5
3 LSWA 135C 40 29,4 58,5 720,0
4 LSWA 135D 40 29,4 66,6 820,0
5 LSWA 135A-2* 40 29,4 38,5 473,2
6 LSWA 135B-2* 40 29,4 48,6 597,5
7 LSWA 135C-2* 40 29,4 58,5 720,0
8 LSWA 135D-2* 40 29,4 66,6 820,0

* - Heat exchange sections are connected in series.