Cooling Towers

MTT Cooling Tower

MTT Cooling Tower

EVAPCO focuses on continuous improvement and is committed to develop the most innovative products in the industry. In keeping with this commitment, EVAPCO’s MTT is the first cooling tower in the industry to feature composite fibreglass panels formed entirely by an advanced, environmentally friendly, LRTM closed mould manufacturing process. The MTT is the result of a collaborative effort and the combined resources of EVAPCO’s global entities. The concept and design basis of the MTT stems from EVAPCO Australia’s proven MEC product line, having 20 years of installed history. Beginning with the MEC concept, EVAPCO Inc. then further developed MTT in SolidEdge, a 3D CAD program, then performed standardisation, strength analysis and generated thermal performance at EVAPCO’s premier Research and Development Headquarters in Maryland, USA. 

EVAPCO Composite Sdn Bhd, in Malaysia then brought the design of life taking responsibility for mould design, pattern making, tooling and finally all FRP parts production utilising LRTM manufacturing process. The MTT is unique in the industry having SolidEdge designed patterns, moulds machined by 5-axis CNC, and with parts manufactured using LRTM. All aspect of the MTT, from concept to design to manufacture are performed “in-house” and by EVAPCO. The final assembly of fabricated and globally sourced components is completed at one of EVAPCO’s facilities. Country of original for the final assembled produts is available from Australia, Belgium, Italy or South Africa.

Design Features

The MTT Cooling Tower is an industry first offering total corrosion resistance with precision moulded LRTM panels. The MTT combines EVAPCO's signature features of easy maintenance, efficient operation and low sound with total corrosion resistance. These features make the MTT the best cooling tower choice in the industry for projects that demand the highest level of corrosion resistance coupled with proven reliability. 

Principle of Operation

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 through the air inlet louvers at the base of the tower and travels upward through the wet deck fill 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 drawn to the top of the cooling tower by the fan and discharged to the atmosphere. The cooled water drains to the basin at the bottom of the tower and is returned to the heat source. 

Efficient Drift Eliminators

The MTT is provided with an efficient drift eliminator system that effectively reduces entrained water droplets from the air discharge to less than 0.001% of the recirculated water flow rate.

The eliminators are constructed of non-corrosive PVC with a multi-pass design for maximum drift reduction. They are assembled in modular sections for easy removal and access to the water distribution system.

In addition to reducing drift, the eliminators also function as effective debris screens which protect the spray system and coils from sunlight and debris.


EVAPCO's PVC fill design used in the MTT Cooling Tower range is designed to induce highly turbulent mixing of the air and water for superior heat transfer. Special drainage tips allow high water loadings without excessive pressure drop.

The fill is constructed of inert polyvinyl chloride, (PVC), will not rot or decay, and is formulated to withstand water temperatures of up to 54.5ºC. The fill is also constructed in easy to handle and removable block form. For design conditions with dirty water or higher temperatures, special fill types are available. Consult your local sales representative for further details. 

High Temperature Solutions

EVAPCO's standard fill and drift eliminators can withstand temperatures up to 54.5ºC. For higher temperature applications, EVAPCO can provide HPVC which is rated for temperatures up to 65.5ºC. For high temperature applications, the standard PVC water distribution system is upgraded to CPVC.

Wide-Pak Fill

EVAPCO's Wide-Pak Fill is CTI Certified and is suitable for dirty water applications. The Wide-Pak Fill maximises efficiency while its wide flute design prevents clogging. Contact your local EVAPCO representative for performance de-rates when performing selections using Wide-Pak Fill. 

Pressurised Water Distribution System

The water distribution system is constructed of PVC pipe and EvapJet ABS plastic water diffusers for corrosion protection in this key area. The piping is easily removed for cleaning.

The wide orifice nozzles mounted on the side of the pipe used in MTT water distribution help prevent clogging, reducing the maintenance costs of the water distribution system. 

The spray pressure for all MTT Cooling Towers is between 7 and 41 kPA at the inlet header. The actual spray pressure will be shown on the submittal which is prepared for each unit. 

View Product Video

EvapJet®  Nozzles

Reduced Joints

The LRTM allows larger, and more complex shapes to be manufactured compared to other processes such as pultruded FRP. As such, the construction of the MTT generally requires less FRP sections and therefore, joints. This improves joints sealing of FRP panels and minimises the occurrences of leaks.

WST Air Inlet Louvers (Water and Sight Tight)

EVAPCO's WST Inlet Louvers keep water in and sunlight out of induced draught products. The unique non-planar design is made from light-weight framed PVC sections which have no loose hardware, enabling easy unit access. The louver air channels are optimised to maintain fluid dynamic and thermodynamic efficiency and block all line-of-sight paths into the basin eliminating splash-out; even when the fans are off. Additionally, algae growth is minimised by blocking all sunlight. The combination of easy access, no splash-out and minimised algae growth saves the end user money on maintenance hours, water consumption and water treatment costs.

Maintenance Features

Designed for easy maintenance, the MTT Cooling Tower leads the industry in service friendly features. The two most critical areas for cooling tower maintenance are the basin and the drive system. The MTT basin section is designed to allow quick and easy access from outside the cooling tower. Just like the basin, all service to the drive system can be safely performed from the side of the cooling tower. This eliminates the need to stand in the cold water basin or add costly fan deck handrails and safety cages for routine service to the bearings, belts, or electrical equipment. EVAPCO's Power-Band Drive System is the easiest belt drive system to maintain in the industry! Click on the features below for more details:

Easy Basin Access

The cold water basin section is easily accessible from ground level by simply removing the two (2) Quick Release Fasteners on the inlet louver assemblies surrounding the cooling tower and lifting out the lightweight louver.

The basin can be accessed from all four (4) sides of the cooling tower. This open basin design enables the MTT basin to be easily cleaned.

Louver Access Door

  • Hinged access panel with quick release mechanism.
  • Allows easy access to perform routine maintenance and inspection of the make-up assembly, strainer screen, and basin.
  • Available on models with 5 foot and taller louvers.

Easy, Removable Air Inlet Louvers with Quick Release Fasteners

The MTT features a Quick Release Fastener design consisting of two (2) large thumbscrews and a latch system. By loosening the thumbscrews, the latch pulls up and out of the louver frame, allowing the Easy, Removable Air Inlet Louvers with Quick Release Fasteners to be removed while the latch and thumbscrews stay on the cooling tower.

Access Panel(s)

EVAPCO's MTT incorporates one man-sized access panel for maintenance as standard. The access panel is designed such that the fill blocks and drift eliminators can be easily removed and replaced for cooling tower cleaning. Additional access panels may be added subject to approval from the factory, contact your local sales representative for more information. 

Drive Ladder and Platform Access

These two accessories are available on 8' wide units and larger. The ladder platform provides access to the motor and lubrication lines for motor checks and maintanance. Where required, EVAPCO is able to provide safety cages for the ladder. The provided ladder and platform assembly are in accordance with AS 1657.

Stainless Steel Strainers

Strainers are subjected to harsh conditions through the life cycle of the tower. The stainless steel strainer is provided by EVAPCO as standard to ensure longevity of the tower pumping system, limiting large dirt or debris from entering. All units are equipped with anti-vortexing baffels (shown) or hoods at the cooling tower, to prevent entrapment at the suction locations.

Sump Sweep Piping

Set up around the perimeter of the basin, the MTT's Sump Sweeper Piping washes the debris toward the sump outlet. This option is also available with high flow eductor nozzles to facilitate in pan cleaning. The system contains one inlet and one outlet connection. Filters, mechanical separators, external piping or controls are not included. Contact your local sales representative for flow rate recommendations.

Drive Systems

The MTT Cooling Tower features the highly successful EVAPCO Power-Band Belt Drive System engineered for heavy-duty operation. The Power-Band Drive System has consistently provided trouble-free operation in the most severe duty cooling tower applications. In addition, the complete drive system including the fan motor is standard with a Five (5) Year Warranty. Click on the features below for more details:

Fan Motors

All direct drive models use MEPS compliant motors as standard. All belt driven units use high efficiency motors as standard. Motors are epoxy coated as standard, unless otherwise requested. 

  • Thermistors (Standard on all motors above 11kW).

  • All motors are VSD compatible.

Power-Band Belt Drive

The Power-Band Belt Drive is a solid-back multi-groove belt system that has high lateral rigidity. The belt is designed for cooling tower service, and is constructed of neoprene with polyester cords. The drive belt is sized for 150 percent of the motor nameplate horsepower ensuring long and trouble free operation. 

Drive System Pulleys

Drive system pulleys located in the warm, moist atmosphere inside the cooling tower are constructed of an aluminium alloy.

Fan Shaft Bearings

The fan shaft bearings on the MTT Cooling Tower are specially selected to provide long life, minimising costly downtime. They are rated for a minimum L-10 life of 75,000 hours, making them the heaviest duty flange mount bearing in the industry used for cooling tower duty.

4’ Wide Models Only

The fan motor is mounted internally, in a direct drive configuration. Access to the drive system for maintenance is via the access panel and ladder and platforms are not required. The TEAO fan motor is epoxy coated as standard.

Five (5) Year Drive Warranty

EVAPCO provides a standard Five (5) Year Motor and Drive Warranty on all Power-Band Belt Drive and optional gear drive MTT Cooling Towers. This unique warranty is designed to offer the end user optimum protection against fan drive and motor failure. It is a comprehensive plan which includes the fan, fan shaft, belts, pulleys, fan bearings, gear box, flexible coupling, driveshaft and the motor.

Optional Equipment

The standard design of the EVAPCO MTT provides the customer with the easiest cooling tower to maintain in the industry. There are additional options which can make maintenance easier and extend the life of the cooling tower. These options are listed below.

·         Material options for steel parts available (SS304 and/or SS316)

·         Vibration Switches

·         Options for high temperature fill and eliminators 

Low Sound Solutions

The MTT Cooling Tower is now available with three (3) options to reduce the overall sound generated from the ends, sides, or top of the unit. Each option provides various levels of sound reduction and can be used in combination to provide the lowest sound level. Consult EVAPCO's 'evapSelect' equipment selection program for full octave band data sheet. 

NOTE: These low sound options may impact the overall installed dimensions and weight of the unit.

Super Low Sound Fan 9 – 15 dB(A) Reduction!

The Super Low Sound Fan offered by EVAPCO utilises an extremely wide chord blade design available for sound sensitive applications where the lowest sound levels are desired. The fan is two-piece molded heavy duty FRP construction utilising a forward swept blade design. The Super Low Sound Fan is capable of reducing the unit sound pressure levels 9 dB(A) to 15 dB(A), depending on specific unit selection and measurement location compared to the original MTT fan. The Super Low Sound Fan will have no impact on unit thermal performance and is CTI Certified. See Table 1 for low sound height and operating weight additions. Note: Available on 8’, 10’ 11' and 12’ wide models only.

Super Low Sound Fan Height and Weight Additions.


Low Sound Fan* 4 – 7 dB(A) Reduction!

The Low Sound Fan offered by EVAPCO is a wide chord blade design for sound sensitive application where low sound levels are desired. The Low Sound Fan shall utilise a unique soft-connect blade-to-hub design that is compatible with Variable Speed Drives. Since the blades are not rigidly connected to the fan hub, no vertical vibration forces are transmitted to the unit structure which reduces sound pressure levels 4 dB(A) to 7 dB(A), depending on specific unit selection and measurement location. The fans are high efficiency axial propeller type and are CTI Certified on the MTT line of cooling towers. 

* The CTI Certified Low Sound Fan will have a thermal performance de-rate up to 3.5%. Consult the factory or evapSelect® program for actual thermal performance.

Water Silencers - Reduces Water Noise in the Cold Water Basin up to 7dB(A)!

EVAPCO’s Water Silencers are located in the cold water basin. The Water Silencers reduces the high frequency noise associated with the falling water and is capable of reducing overall sound levels 4dB(A) to 7dB(A) measured at 1.5m from the side or end of the unit. The water silencers reduce overall sound level 9dB(A) to 12 dB(A) (depending on water loading and louver height) measured 1.5m from the side or end of the unit when water is circulated with fans off. The Water Silencers are constructed of lightweight PVC sections and can be easily removed for access to the basin area. This option has no impact on unit thermal performance.

Note: Water Silencers are not available on 4’ wide models and models with “No Basin”.