eco-ATWB-H Closed Circuit Cooler
The eco-ATWB-H is an induced draft, counterflow design closed circuit cooler with a CTI Certified capacity range of 850 to 16700 MBH (250 to 4895 kW). Standard construction includes the patented, high efficiency EVAPCO Ellipti-fin Coil, EVAPCO’s new ARID fin Pak™ dry coil, and G-235 (Z-725 Europe) galvanized steel casing and basin. Type 304 or 316 stainless steel construction is available for the basin or the entire unit.
- Continuous water savings, even when the spray pump is energized
- Highest dry bulb switchover temperatures
- Plume abatement
- Plume elimination
The NEW eco-ATWB-H Hybrid line of closed circuit coolers was designed with the purpose of providing maximum water savings, higher dry bulb switchover temperatures, while achieving plume abatement or elimination.
The eco-ATWB-H is provided with EVAPCO’s new ARID fin Pak™ dry coil. Utilizing stainless steel tubes and aluminum manganese fins, the ARID fin Pak™ maximizes the total surface area available for sensible heat transfer, which results in maximum water savings and higher dry bulb switchover temperatures. Additionally, the eco-ATWB-H is provided with the highly efficient Ellipti-fin® coil in series with the ARID fin Pak™, achieving both latent and sensible cooling simultaneously. Located in the discharge airstream, the ARID fin Pak™ heats the saturated discharge air, abating or eliminating the plume. Because the coils are in series, a significant portion of the heat load will always be dissipated through the dry cooling coil, saving water whenever it is in operation!
The eco-ATWB-H is the ideal solution for: Maximized Water Savings, Highest Dry Bulb Switchovers, Plume Reduction or Plume Abatement.
- Principle of Operation
- Ellipti-fin® Cooling Coil
- Pressurized Water Distribution System
- Superior Air Inlet Louver and Screen Design
- Efficient Drift Eliminators
- Arid Fin-Pak Cooling Coil
- Fast, On-Time Shipments
- IBC Compliant
- Sage 2 Control System
Dry Mode (Sensible Heat Transfer)
In the dry mode, the process fluid enters the ARID fin Pak™ coil through the top coil connections. The fan motor is energized, while the spray pump is deenergized. The axial fan draws air upward through the louvers and across the coils. As the air passes over the ARID fin Pak™ coil, a portion of the load is dissipated to the atmosphere through the tube walls and fins using sensible heat transfer. The warm process fluid exits the ARID fin Pak™ coil, then enters the Ellipti-fin® coil through the factory installed piping. The remaining load is dissipated through the tube and extended surface fins of the Ellipti-fin® coil utilizing sensible heat transfer. The unit will remain in the dry mode of operation until the temperature set point can no longer be met. In this mode, NO water is used and plume is eliminated.
Evaporative mode (Latent and Sensible Heat Transfer)
Once the temperature set point can no longer be met, the unit will switch to the Evaporative mode. This mode of operation in the eco-Hybrid utilizes evaporative and dry cooling simultaneously. First, the process fluid enters the ARID fin Pak™ coil through the top coil connections. The fan and pump motors are energized. A portion of the heat load is transferred through the tube walls and fins to the air passing over the ARID fin Pak™ coil. No water is evaporated during this process. The warm process fluid exits the ARID fin Pak™ coil, then enters the Elliptifin® coil through the factory installed piping. The spray system cascades water over the tubes of the Ellipti-fin® coil while heat is absorbed by the water. Air is drawn
upward and over the coils by the axial fan. A small amount of the recirculating water is evaporated due to latent heat transfer through the tube and fin walls of the Ellipti-fin® coil. In this mode, water usage is reduced and plume is abated as the saturated discharge air is heated as it passes over the ARID fin Pak™ coil.
Ellipti-fin® Cooling Coil
The new eco-ATWB-H Closed Circuit Cooler utilizes Evapco's patented Ellipti-fin® coil design which assures even greater operating efficiency. The elliptical tube design allows for closer tube spacing, resulting in greater surface area per unit plan area than round-tube coil designs. In addition, the revolutionary Ellipti-fin® design utilizes elliptical spiral fin coil technology which has an inherent air side pressure drop lower than finned round tube designs. This permits greater water loading, making the new Ellipti-fin® coil the most effective design available.
The coils are manufactured from high quality steel tubing following the most stringent quality control procedures. Each circuit is inspected to ensure the material quality and then tested before being assembled into a coil. Finally, the assembled coil is pneumatically tested at 400 psig under water to ensure it is leak free.
To protect the coil against corrosion, it is placed in a heavy steel frame and then the entire assembly is dipped in molten zinc (hot-dip galvanized) at a temperature of approximately 800°F.
Maintenance Free ZMII® Spray Nozzle
Water Distribution System
EVAPCO’S Zero Maintenance ZMII® Spray Nozzle remains clog-free while providing even and constant water distribution for reliable, scale-free evaporative cooling under all operating conditions. The heavy duty nylon ZMII® Spray nozzles have a 1-5/16" diameter opening and a 1-1/2" splash plate clearance. Furthermore, the fixed position ZMII® nozzles are mounted in corrosion-free PVC water distribution pipes that have threaded end caps. Together, these elements combine to provide unequaled coil coverage and scale prevention, making it the industry’s best performing non-corrosive, maintenance-free water distribution system.
Superior Air Inlet Louver and Screen Design
The air inlet louver screens on the eco-ATWB are constructed of corrosion-free PVC. They are a two pass design that minimizes splashout and reduces the potential for algae formation inside the cooler.
In single pass louver systems used by other manufacturers, circulating water droplets tend to splashout, especially when the fans are shut off. With the two pass louver system, the water droplets are captured on the inward sloping pass, minimizing splashout problems.
This unique louver design completely encloses the basin area. Direct sunlight is blocked from the water inside the cooler, thereby reducing the potential of algae formation. Water treatment and maintenance costs are substantially reduced.
While effectively containing the recirculating water and blocking sunlight, the louver design has a low pressure drop. The low pressure drop results in lower fan energy consumption, which reduces the operating costs of the cooler.
Efficient Drift Eliminators
The eco-ATWB-H is equipped with an efficient drift eliminator system that effectively reduces entrained water droplets from the air discharge to less than 0.001% of the spray 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 from sunlight and debris.
ARID fin Pak™ Dry Cooling Coil
The new eco-ATWB-H Closed Circuit Cooler utilizes the ARID fin Pak™ Dry Cooling Coil. Installed in the air discharge of the cooler the ARID fin Pak™ dry cooling coil is piped in series with the evaporative cooling coil. The ARID fin Pak™ dry cooling coil is constructed of 304L Stainless Steel tubes and tubular Stainless Steel header with carbon steel coil connections for easy field piping. The fins have fully drawn collars to maintain consistent fin spacing and continuous surface contact over the entire tube to maximize heat transfer. The fins are constructed of Aluminum/Manganese alloy for superior corrosion resistance.
Fast, On-Time Shipments
The eco-ATWB is completely factory assembled and manufactured by a dedicated professional workforce, expert in building closed circuit coolers. Factory trained mechanics and EVAPCO's strict quality control and inspection procedures guarantee the quality of every unit shipped.
EVAPCO's controlled factory environment ensures fast on-time shipments, allowing the eco-ATWB to be available WHEN THE CUSTOMER WANTS IT!
What is IBC?
- The International Building Code requires that evaporative cooling equipment must meet the same seismic or wind load forces as the building to which they are attached.
How does it apply?
- Based on project zip code and site design factors, calculations are made to determine the equivalent seismic "g force" and wind load on the unit.
What does EVAPCO offer?
- Standard Structural Design
-Projects with ≤ 1.0g seismic or 145 psf wind loads
- Upgraded Structural Design
-Projects with > 1.0g seismic or 145 psf wind loads
- The upgraded structural design package for the New ATWB is designed for 5.12g and 145psf, making it applicable to ALL building locations in North America.
Water and Energy Conservation Control System
The best way to properly control and operate the eco-ATWB-H Closed Circuit Cooler is with the optional Sage2 ® Water and Energy Conservation Control System. The Sage2 ® is designed to optimally control the fan motor(s) and the pump motor(s) of the unit. The Sage2 ® will efficiently reject the building load using the minimal amount of water and energy.
Designed for easy maintenance, the eco-ATWB-H Closed Circuit Cooler leads the industry in service friendly features. The three most critical areas for closed circuit cooler maintenance are the basin, drive system, and coil. The eco-ATWB-H basin section is designed to allow quick and easy access from outside the cooler. Just like the basin, all service to the drive system can be safely performed from the side of the cooler, and EVAPCO's Power-Band drive system is the easiest belt drive system to maintain in the industry! The exclusive Ellipti–fin™ Technology (Patent Pending) and EVAPCO’s new ARID fin Pak™ dry coil are designed for trouble-free maintenance and long life straight from the factory.
- Motor Mount, Power Band Belt Adjustment and Bearing Lubrication - 3',4',8-1/2' & 17' Wide Models
- Motor Mount, Power Band Belt Adjustment and Bearing Lubrication - 12' & 24' Wide Models
- Easy, Removable Air Inlet Louvers with Quick Release Fasteners
- Easy Access
- Clean Pan Design
- Stainless Steel Strainers
Motor Mount, Power Band Belt Adjustment and Bearing Lubrication
The fan motor and drive assembly are designed to allow easy servicing of the motor and adjustment of the belt tension from the exterior of the unit. The T.E.F.C fan motor is mounted on the outside on these models and is protected from the weather by a cover which swings away for maintenance.
A large hinged access door is located on the side of the unit for easy access to the fan drive system. The belt can be adjusted by tightening the J-Bolts on the motor base and the tension can be checked easily through the access door, all while standing at the side of the unit.
The bearings can also be lubricated from the side of the unit. The bearing lubrication lines have been extended to the exterior casing and are located by the access door, thus making bearing lubrication easy.
Sloped access ladders and working platforms are available as an option to facilitate maintenance.
Go to Optional Equipment for details.
Motor Mount, Power Band Belt Adjustment and Bearing Lubrication
The T.E.A.O. fan motor is located inside the fan casing on the large eco-ATWB Closed Circuit Cooler, and is mounted on a rugged heavy duty motor base. The motor base is designed to swing completely to the outside of the unit through a very large, hinged (14 square feet) (1,3 square meters) access door greatly simplifying motor maintenance.
The unique swinging motor mount designed for these models features easy belt adjustment from the exterior of the unit. The T.E.A.O. fan motor is mounted on an adjustable base which is supported by two heavy duty galvanized steel pipes. The belt is adjusted by tightening an all-thread which runs through the motor base.
The innovative motor base features a unique locking mechanism for a positive belt adjustment and is also used to adjust the belt tension if a wrench is not available.
Bearing lubrication fittings are extended to the side of the unit inside the access door to allow easy application of the bearing lubricant. This external location allows for easy servicing of the bearings and is another important advantage of EVAPCO equipment.
To facilitate motor removal, an optional motor davit is available.
Go to Optional Equipment for details.
Easy, Removable Air Inlet Louvers with Quick Release Fasteners
The eco-ATWB-H features a Quick Release Fastener design consisting of (2) two large thumbscrews and a latch system. By loosening the thumbscrews, the latch pulls up and out of the louver frame, allowing the louver to be removed while the latch and thumbscrews stay on the closed circuit cooler.
The cold water basin section is easily accessible from ground level by simply removing the (2) two Quick Release Fasteners on the inlet louver assemblies surrounding the closed circuit cooler and lifting out the lightweight louver.
The basin can be accessed from all (4) four sides of the cooler. This open basin design enables the eco-ATWB basin to be easily cleaned.
Clean Pan Design
The eco-ATWB-H features a sloped basin from the upper to lower pan section. This "Clean Pan" design allows the water to be completely drained from the basin. The closed circuit cooler water will drain from the upper section to the depressed lower pan section where the dirt and debris can be easily flushed out through the drain. This design helps prevent buildup of sedimentary deposits, biological films and minimizes standing water.
Stainless Steel Strainers
The EVAPCO standard for many years, the stainless steel strainer is one component of the closed circuit cooler subject to excessive wear and corrosion. With stainless steel construction, this component will last the life of the cooler.
The eco-ATWB-H Evaporative Cooler 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 evaporative condenser applications. In addition, the complete drive system including the fan motor is standard with a (5) Five Year Warranty.
All eco-ATWB-H Closed Circuit Cooler models utilize heavy duty totally enclosed (T.E.F.C. or T.E.A.O) fan motors designed specifically for closed circuit cooler applications. In addition to the standard motors offered on each cooler, EVAPCO offers many optional motors to meet your specific needs, including:
- Premium Efficiency Motors
- Multi-Speed Motors
- Inverter-Duty Motors for VFD Applications
8.5' (2,6 m) wide eco-ATWB-H models feature T.E.F.C. motors are located on the outside of the unit, protected by a hinged, swing away cover. 12' (3,7 m) wide eco-ATWB-H models have T.E.A.O. motors located inside the fan section on a heavy duty motor base which swings to the outside for repair or removal.
Five (5) Year Warranty
EVAPCO provides a standard five (5) year motor and drive warranty on all direct drive Power-Band belt drive and optional gear drive eco-ATWB-H Closed Circuit Coolers. 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, sheaves, fan bearings, gear box, flexible coupling, driveshaft and the motor.
Fan Shaft Bearings
The fan shaft bearings on the eco-ATWB-H Closed Circuit Cooler are specially selected to provide long life, minimizing costly downtime. They are rated for an L-10 life of 75,000 to 135,000 hours, making them the heaviest duty pillow block bearing in the industry used for Closed Circuit Cooler duty.
Drive System Sheaves
Drive system sheaves located in the warm, moist atmosphere inside the closed circuit cooler are constructed of an aluminum alloy. Those located externally are protected by a hinged cover.
Power-Band Belt Drive
The Power-Band drive is a solid-back multigroove belt system that has high lateral rigidity. The belt is designed for closed circuit cooler 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.
The standard design of the EVAPCO eco-ATWB-H provides the customer with the most efficient and easiest Closed Circuit Cooler to maintain in the industry. There are additional options which can make maintenance easier, extend the life, or enhance the performance capabilities of the Closed Circuit Cooler. These options are listed below.
- Sloped Access Ladders
- Stainless Steel Basin
- Working Platform & Ladder with Davit
- Electric Water Level Control
- Electric Immersion Heaters
- Remote Sump Configuration
- Low Sound Solutions
- Pulse~Pure® Water Treatment System
Sloped Access Ladders
A sloped access ladder is available for 8.5' and 12', (2,6 and 3,7m) wide eco-ATWB-H models. The EVAPCO designed access ladder features a sloped "ships type" ladder arrangement which provides fast and easy access to the water distribution system and drive components. A grab bar is attached to the sloped ladder for safe and easy ascent and descent. There is no need for safety cages or railings with this design. The ladder(s) will ship loose and must be field mounted. The sloped ladder meets all applicable OSHA requirements.
Stainless Steel Water Basin
EVAPCO coolers have a modular design which allows specific
areas to be enhanced for increased corrosion protection. The
basin area of the cooler experiences turbulent mixing of air
and water, in addition to silt build-up. In conjunction with the
EVAPCOAT Corrosion Protection System, EVAPCO offers an optional Stainless Steel Basin. This option provides Type 304 or 316 stainless steel for the entire basin area including the support columns of the cooler and the louver frames. The basin section provides structural support for the unit; it is also the part of the unit that is most prone to corrosion. For maximum protection against corrosion, EVAPCO can provide a Stainless Steel Basin as an affordable option.
Working Platform & Ladder with Davit
Eco-Coolers are available with a self-supported external working platform and ladder. Two separate platforms will allow easy access to the motor and drive system, water distribution system as well as the ARID-fin Pak™ coil. The working platforms are constructed of the heavy duty galvanized steel. The OSHA compliant working platform option uses a straight ladder as standard and ships in sections for easy installation.
The optional davit eliminates crane rentals and facilitates the removal of motors and fans. The davit is constructed of aluminum for ease of use. When the davit is ordered, the galvanized steel bracket is mounted on the side of the unit. The Davit ships loose and is installed in the field.
Electric Water Level Control
EVAPCO closed circuit coolers are available with an optional electric water level control system in place of the standard mechanical makeup valve and float assembly. This package provides very accurate control for the basin water level and does not require field adjustment, even under varying operating conditions.
The control was designed by EVAPCO and is manufactured exclusively for EVAPCO. It consists of multiple heavy duty stainless steel electrodes. These electrodes are mounted external to the unit in a vertical stand pipe. For winter operation, the stand pipe must be wrapped with electric heating cable and insulated to protect it from freezing.
The weather protected slow closing solenoid valve(s) for the makeup water connection is factory supplied and is ready for piping to a water supply with a pressure between 5 and 125 psig (35 kPa and 860 kPa).
Electric Immersion Heaters
Electric immersion heaters are available as an option and are located in the basin of the cooler. They are sized to maintain a +40°F (4.4°C) pan water temperature at 0°F (-18°C) ambient with the fans off *. They are furnished with a thermostat and low water protection device to cycle the heater on when required and to prevent the heater elements from energizing unless they are completely submerged. All components are enclosed in rugged, weather proof enclosures for outdoor use. Heater control packages that include contactor, transformer or disconnects are available.
(*) - Electric heater selection based on 0°F (-18° C) ambient temperature. For alternate low ambient heater selections consult the factory
Remote Sump Configuration
For units operating in areas where temperatures may be very low, or where low temperatures may occur during periods when the unit is not operating, a sump located inside the building is the preferred means of ensuring that the basin water will not freeze. For these applications, the cooler will be supplied without the spray pump, suction strainers and all associated piping, but is furnished with an oversized bottom outlet.
Solutions for Sound Sensitive Applications
The eco-ATWB-H Closed Circuit Coolers are now available with four (4) equipment options to reduce the overall sound generated from the side or top of the eco Closed Circuit Cooler. Each option provides various levels of sound reduction and options can be combined to provide the lowest sound level. Consult EVAPCO’s evapSelect selection program for unit sound levels. If a detailed analysis or full octave band data sheet is required for your application, please consult your EVAPCO Sales Representative.
NOTE: These low sound options may impact the overall installed dimensions of the eco-ATWB-H Closed Circuit
Pulse~Pure® Water Treatment System
The eco-ATWB-H is available with EVAPCO’s optional Pulse~Pure® non-chemical water treatment system. The Pulse~Pure® Water Treatment System utilizes pulsed-power technology to provide CHEMICAL FREE Water Treatment and is an environmentally responsible alternative for treating water in evaporative cooled equipment. It does not release harmful by-products to the environment and eliminates costly chemicals completely from cooler drift and blowdown. The Pulse~Pure® system delivers short, high-frequency bursts of low energy electromagnetic fields to the recirculating water in the eco-ATWB-H and will:
- Control Bacteria to Levels Well Below Most Chemical Water Treatment Programs
- Control the Formation of Mineral Scale on Heat-Exchange Surfaces.
- Save Water by Operating at Higher Cycles of Concentration
- Yield Corrosion Rates Equivalent to Chemical Water Treatment
More benefits of offering EVAPCO’s Pulse~Pure® Water Treatment System on the new eco-ATWB are:
- Pulse~Pure® Factory Mounting - Factory Installation of the Pulse~Pure® System Guarantees Your Water Treatment is Installed to Factory Specifications.
- Integral Cutting Edge Conductivity Control and Blowdown Packages that are contained in a single feeder panel:
Conductivity Control Package – Measures Conductivity Utilizing a Non-Fouling Torodial Probe
- One power connection of 120 volt or 460 volt is all that is required.
- USB port for downloadable 60 day audit trail of system operation.
- Self draining conductivity loop.
Motorized Blowdown Valve – Standard for the most reliable operation in bleed control. Three-way valve operation provides good bleed flow without a standing column of water.
Because ongoing water treatment service is an absolute requirement for any evaporative cooled system, each purchase of a Pulse~Pure® Water Treatment System includes, as standard, a 1 year water treatment service and monitoring contract provided by your EVAPCO Representative EVAPCO’s Pulse~Pure® system offers eco-ATWB-H owners a single-source of responsibility for equipment, water treatment and service. Patent #: 7,704,364
- Design Features
- Maintenance Features
- Drive Systems
- Optional Equipment
- Unit Specifications
- Thermal Performance
- Product Video
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