Factory Assembled Cooling Towers

LSTE Cooling Tower

LSTE Cooling Tower

Forced draft centrifugal fans counterflow cooling tower. Executed as per standard with Z-725 (725 g/m² zinc) galvanized steel panels. Applicable for airconditioning and industrial cooling.

An LSTE cooling tower is the ideal solution for sound-sensitive installations (LS = Low Sound) due to the centrifugal fan with forward curved fan blades to allow static pressure for the installation of sound-attenuators.

The LSTE units can be installed indoors due to the compact design and the available static pressure. Ductwork can be added on air-inlet and outlet side.

The LSTE cooling tower range is CTI (Cooling Technology Institute) certified in the USA and is complient with the International Building Code (IBC). Evapco Europe provides with each cooling tower a Thermal Performance Guarantee. LSTE-units have a maximum nominal capacity of 6 MW.

Long-lasting corrosion protection is guaranteed with the Z-725 heavy gauge mill hot-dip galvanized steel (Z-725 = 725 g/m² zinc) casing. The galvanized steel construction withstands the most difficult environmental and operating conditions.

For special applications, Evapco can produce the units with a stainless steel sump, with a water touched stainless steel construction or a full stainless steel execution (AISI 304 and 316 are possible).  

Technical Data 

  • Unit:    Open cooling tower
  • Models:    57 Models (LSTE 5112 till LSTE 10636)
  • Width:    1.664 / 2.388 / 2.991 mm
  • Design:    Forced draft
  • Capacity:    685 till 5.930 kW
  • Air Flow:    approx. 17,7 till 127,0 m³/s
  • Fan:    Centrifugal
  • Drive:    Belt driven


  • Easy rigging
  • Small footprint
  • Low sound
  • Indoor installation possible

NEW: Easy rigging

A new field assembly seam design which ensures easier assembly and reduced potential for field seam leaks. Self-guided channels guide the fan casing section easily into position improving the quality of the field seam and eliminates up to 66% of fasteners.
Furthermore is the ease of mounting ductwork, discharge hood and attenuation enhanced by the full integration within the casing section of the eliminators.

Small footprint

The LSTE cooling tower range is designed to minimize the cooling tower footprint. The fan is installed underneath the fill section and not besides it like the LPT. Low occupation of ground surface (footprint) is sometimes required when limited equipment area is available.

Low sound

The standard installed forward curved centrifugal fan has a natural low sound emission. Installation of an inlet attenuator will reduce the dominant fan-noise significantly. Additional reductions can be established by installing outlet sound attenuators, these will further reduce the sound emmision of the fan but also of the spray system.

Indoor installation possible

Indoor installation often require ducting from the cooling tower to the building. By increasing the motor size of the centrifugal fan, additional external static airpressure can be accepted without thermal performance loss.

Warm water from the heat source is pumped to the water distribution system at the top of the tower. The water is distributed over the wet deck fill by means of large orifice nozzles. Simultaneously, air is drawn in by the centrifugal fans inside the fan and drive enclosure and directed upward into the fill casing opposite the water flow. A small portion of the water is evaporated which removes the heat from the remaining water. The warm moist air is discharged to the atmosphere while the cooled water drains to the basin at the bottom of the tower and is returned to the heat source. The vertical air discharge of the LSTB design and the distance between the discharge air and the fan intake reduce the chance of air recirculation since the warm humid air is directed up and away from the unit. For detailed layout information, please consult EVAPCO’S Equipment Layout Guidelines.

1. Casing and basin design

High Performance drift eliminators
Certified in accordance with Eurovent OM-14-2009 

The drift eliminators remove entrained water droplets from the air stream to limit the drift rate to less than 0.001% of the recirculating water rate. The unit can be located in areas where minimum water carryover is critical. The drift eliminators are constructed of an inert polyvinyl chloride (PVC) plastic material which effectively eliminates corrosion of these vital components. They are assembled in sections to facilitate easy removal for inspection of the water distribution system.
New: The eliminators are now fully integrated within the casing section for easy mounting of ductwork, discharge hood and attenuation.

Z-725 Galvanized steel panels 

EVAPCO has developed the ultimate system for corrosion protection in galvanized steel construction - the EVAPCOAT Corrosion Protection System. Z-725 is the heaviest level of galvanizing available for manufacturing evaporative condensers and has a minimum of 165% more zinc protection than competitive designs using Z-275 steel.

2. Heat transfer system

Counterflow fill 

EVAPCO’s patented EVAPAK® fill is specially designed to induce highly turbulent mixing of the air and water for superior heat transfer. The fill sheets are thermally formed into a cross flute design. The individual fill sheets are bonded together to form rigid fill blocks. The fill blocks are then stacked within the unit’s protective casing. The structural strength of the assembled fill pack enables it to be used as a working platform. EVAPCO fill is impervious to rot and decay.

3. Mechanical design

Centrifugal fan

Statically and dynamically balanced galvanized centrifugal fans with forward curved fan blades. The centrifugal fans allow static pressure to be added to the unit for installation of attenuators, anti-fog coils, ducts, etc...

Single speed fan motor 

Each Evapco unit is equipped as per standard with a heavy duty, single speed IP55 TEFC / TEAO electrical motor.

4. Water distribution

Spray nozzles

The water distribution system is made with non-corrosive materials durable ABS plastic nozzles.

Spray-water distribution system 

The water distribution system is enclosed and completely protected by the casing panels and drift eliminators. The water distribution system is made with non-corrosive materials including schedule 40 PVC pipe and durable ABS plastic nozzles. The spray branch piping is easily removed and designed with threaded end-caps for easy cleaning. Evapco’s design avoids the problems of biological growth and clogging.

5. Maintenance and inspection

NEW: Sloped basin

A completely sloped basin allows the water to be drained from the basin. Debris can be easily flushed out through the drain and this helps to prevent buildup of sedimentary deposits, biological fouling and minimizes standing water.

Round access door

The circular access door is provided to allow access to the basin. All float-valve and strainer assemblies are located near the door for easy adjustment and cleaning.

6. Operational control

Mechanical water level control

Simple but reliable water level control system with adjustable mechanical floadbal and brass float-valve.