eco-ATWB Closed Circuit Cooler

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eco-ATWB installation
closed circuit cooler eco-ATWB
water savings eco-ATWB
Environmentally Conscious Operation ATWB

The eco-ATWB dramatically reduces water and energy consumption by increasing the unit's efficiency in both the evaporative and dry cooling modes of operation.

The eco-ATWB’s Ellipti-fin® Cooling Coil now features CrossCool™ Internal Tube Enhancement, increasing the internal heat transfer coefficient of the coil and thus the cooling capacity of the unit. The eco-ATWB offers the most models and box sizes in the industry and is designed with IBC Compliant Construction and CTI Certified Performance.


  • SAVES WATER! Significantly increased drybulb switchover temperature
  • Ranging in capacity from 117 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

eco-ATWB Dry ModeIn dry mode, the recirculating spray pump is deenergized (Fan on, Pump off). The process fluid enters the eco-ATWB cooler through the top coil connection and circulates through the finned coil with the fan energized. Heat from the process fluid dissipates to the atmosphere by sensible heat transfer through the tube wall and fins to the air passing over the coils. The coils are finned to promote optimal airflow over the coil, and to maximize heat transfer area. Air is drawn over the finned coil by the fan drive system. 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.

Evaporative Mode

eco-ATWB Evaporative ModeIn evaporative mode, the process fluid enters the Ellipti-fin coil through the top coil connection and circulates through the finned coils. The water distribution system system cascades water over the tubes of the Ellipti-fin coil, transferring heat to the water. Air is drawn upward and over the coils by the axial fan, agitating the falling water and increasing the transfer of heat. A small amount of the recirculating water evaporates due to latent heat transfer through the tube and fin walls of the Ellipti-fin coil, removing heat from the system. The cooled fluid then returns to the process via the bottom coil connection. This mode of operation provides fan energy savings due to enhanced evaporative performance and lower leaving water temperatures by utilizing evaporative cooling.

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
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
Document Categories
Name File Size Type Language
Coil Rigging 5.15 MB Catalog English
Eco Coolers: eco-ATWB, eco-ATWB-E Bulletin 23.92 MB Catalog English
Eco-ATWB Unit Specifications 24.14 KB Specification Sheet English
Equipment Layout Manual for Cooling Towers, Evaporative Condensers & Closed Circuit Coolers 7.44 MB Layout English
HVAC Products: Features & Applications 12.74 MB Catalog English
HVAC产品的特点与应用指导 18.07 MB 样本 Chinese
Low Sound Solutions Brochure 1.13 MB Catalog English
Maintenance Check List 56.28 KB O & M English
Operation and Maintenance Instructions 19.28 MB O & M English
Operation and Maintenance Instructions for Closed Circuit Coolers and Condensers 19.17 MB O & M English