Evapco Inc.

- Model eco-ATWB-E - Closed Circuit Cooler

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Thanks to EVAPCO's commitment to product development, the eco-ATWB-E line of coolers stands as one of the most water and energy efficient units in the industry. Featuring two water distribution systems and the Ellipti-fin® Cooling Coil, the eco-ATWB-E design allows for three modes of operation: 100% wet, 100% dry, or a hybrid wet/dry mode for increased dry performance and water efficiency combined.

  • Provides unmatched water and energy savings with the eco-ATWB-E's 'water efficient' mode, programmed into EVAPCO's SAGE control system
  • Offers the most models and box sizes in the industry
  • SAVES WATER! Significantly increased drybulb switchover temperature
  • Ranging in capacity from 1,641 to 50,716 MBH
  • IBC Compliant – Independently certified by the International Building Code to withstand seismic and wind load forces in North America; available with IBC Upgraded Structural Design to meet the strictest of building requirements
  • Independently certified by the Cooling Technology Institute
  • Available with FM Approved Construction

Dry Mode

  • The unit maintains dry mode operation until the temperature set point can no longer be met
  • While in dry mode, no water is used, thus plume is eliminated
  • Dry mode operation can save thousands in water usage and sewage costs annually

In dry mode, the process fluid enters the Ellipti-fin coil through the top coil connections. The fan motor is energized, while the spray pump is turned off. The axial fan draws air upward through the louvers and across the coils. As the air passes over the coil, a portion of the load is dissipated to the atmosphere through the tube walls and fins using sensible heat transfer. The cooled fluid then returns to the process via the bottom coil connection. 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.

Wet-Dry Mode

  • Unique to the eco-ATWB-E
  • Once the temperature set point can no longer be met, the unit switches to partial evaporative mode
  • This mode of operation greatly reduces water usage while still maintaining the temperature set point

The joint wet and dry operation mode provides water savings as well as low approach temperatures. In this joint mode of operation, the fan is on and the process fluid enters the coils through the top coil connections (Fan on, Pump A on, Pump B off). Recirculating pump B is turned off and coil B rejects a portion of the heat load to the atmosphere through the tube and fin walls to the air passing over the coils through sensible heat transfer. Pump A is on, and heat from the process fluid transfers through the coil tubes to the water cascading downward over coil A. This mode of operation minimizes the amount of water used while maintaining the cooling capacity required. The cooled fluid then returns to the process via the bottom coil connection.

Evaporative Mode


Once the temperature set point can no longer be met, both recirculating pumps are turned on and the unit runs in full evaporative mode. As the axial fan draws air upwards over the coils, water cascades downwards, and heat from the process fluid transfers through the coil tubes to the water. The cooled fluid then returns to the process via the bottom coil connection.

Ellipti-fin Cooling Coil

  • The most effective coil design in the industry
  • 25% average increase in efficiency
  • Elliptical fins increase surface area and heat transfer
  • Hot-dip galvanized for increased corrosion resistance

Drift Eliminators

  • Limits the drift rate to less than 0.001% of the recirculating water rate
  • Limit the potential of spreading Legionella
  • Constructed of an inert polyvinyl chloride (PVC)

Superior Air Inlet Louver and Screen Design

  • Constructed of an inert polyvinyl chloride (PVC)
  • Two pass design that minimizes splash-out and the potential for algae formation inside the tower
  • Framed in steel in easily removable sections

Pressurized Water Distribution System

EVAPCO's Zero Maintenance ZMII spray nozzle remains clog free while providing even and constant water distribution, providing the industry's best performing non-corrosive, maintenance-free water distribution system.

  • ZMII spray nozzles have a 1-1/4' diameter opening and a 1-1/4' splash plate clearance
  • Mounted in corrosion-free PVC water distribution pipes that have threaded end caps
  • Provides unequaled coil coverage and scale prevention

Stainless Steel Water Touch Basin

  • Available in Type 304 or Type 316 Stainless Steel
  • Includes the entire basin area including the support columns and the louver frames
  • Welded basin seams for leak-free operation

Stainless Steel Casing & Fan Section

  • Available in Type 304 or Type 316 Stainless Steel
  • Includes the entire upper section including fan guard

Sound Sensitive Installations

Available with multiple equipment options to reduce the overall sound generated from the side or top of the unit.

  • Super Low Sound Fan
  • Low Sound Fan
  • Water Silencers
  • Discharge Attenuation
  • Offset Sound Attenuation Walls

FACTORY-MOUNTED Water Treatment Systems

Available with FACTORY-MOUNTED water treatment systems, providing environmentally sensitive alternatives for treating water in evaporative cooled equipment.

  • SmartShield solid chemical water treatment system
  • Pulse-Pure CHEMICAL-FREE water treatment system

Maintenance Accessories

Available with multiple equipment options to aid in the maintenance of the closed circuit cooler.

  • External service platform
  • Basin level platform
  • Sloped ladder
  • Hinged louver access door
  • Motor davit with base

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