Evapco Inc.

- Model ESWB - Closed Circuit Cooler



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

  • Incredibly energy efficient, maximizing capacity in the smallest footprint and lowest connected horsepower
  • Unique design eliminates need for a discharge hood with dampers and reduces freezing concerns during winter months
  • Reduced footprint, excels where space is a concern
  • Ideal for replacing older, inefficient and outdated units
  • Ranging in capacity from 1,231 to 13,362 MBH
  • IBC Compliant – Independently certified by the International Building Code to withstand seismic and wind load forces in North America
  • Independently certified by the Cooling Technology Institute


EVAPCO is proud to be the first to develop a closed circuit cooler with patented Combined Indirect and Direct Cooling technology. The pump is energized, and water circulates up to the water distribution system. The large orifice EvapJet® nozzles evenly distributes water as a thin film over the extended fill surface for maximum cooling efficiency. Simultaneously, the fan system moves large volumes of air through the unit in the opposite direction of the falling water. The air and water contact directly across the fill surface, whereupon a small portion of the spray water evaporates; the warm and saturated air is then discharges from the unit, removing heat from the system. The spray water exits the fill section as a cooled fluid where it is collected by the redistribution basin for even soaking of the full footprint coil. The hot process fluid enters the coil through the bottom coil connection(s). The heat load is rejected to the circulating water that cascades over the coil surface by means of sensible heat transfer.

Patented Sensi-Coil Technology

  • An innovation of the already powerful Thermal Pak II coil
  • Increases total coil surface area by 20%
  • Features EVAPCO’s patented CrossCool™ Internal Tube Enhancement, increasing heat transfer

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 Evapjet® 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.

  • Enclosed and completely protected by the casing panels and drift eliminators
  • Design eliminates the problems of biological growth and clogging that can occur with other system designs
  • Mounted in corrosion-free PVC water distribution pipes that have threaded end caps
  • Provides unparalleled fill coverage

Redistribution Basin

  • Ensures even water loading of the full footprint Sensi-Coil
  • Enclosed and completely protected by the air inlet louvers
  • Functions as an effective debris screen which block sunlight and prevent debris from entering redistribution system
  • Easily inspected with the removal of the framed air inlet louvers

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

Stainless Steel Sensi-Coil

Stainless Steel Coils provide Superior corrosion resistance for hostile environments and is available with the standard EVAPCO lead time! The EVAPCO 304 SST coil option can be manufactured as an ASME coil and is CTI certified.

  • Available in Type 304 or Type 316 Stainless Steel

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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