Closed Circuit Coolers

ESWB Closed Circuit Cooler

ESWB Closed Circuit Cooler

The ESWB is an induced draft, counterflow design closed circuit cooler with a Eurovent-CTI Certified capacity range of 170 to 2,130 kW. Standard construction includes the patented, high efficiency Sensi-Coil® Technology featuring CrossCool™ Internal Tube Enhancement, EVAPAK Fill and Z-725 galvanized steel casing and basin. Type 304 stainless steel construction is available for the basin and the redistribution basin or the entire unit.

The ESWB stands apart as being the most energy efficient and the quitest axial faén closed circuit cooler on the market today.  The ESWB is able to provide superior performance as a result of its full footprint patented Sensi-Coil® Technology. The Sensi-Coil® now features CrossCool™ Internal Tube Enhancement which increases the internal heat transfer coefficient of the coil and thus increases the cooling capacity of the unit.

The ESWB’s Cooling Technology Institute † certified performance, new owner oriented features and independent certification of the International Building Code (IBC) compliance reinforce the ESWB’s position as a premier cooler in the HVAC industry.




Designed for easy maintenance, the ESWB 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 ESWB 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 Thermal-Pak® Coil is designed for trouble-free maintenance and long life straight from the factory.



The ESWB Closed Circuit Cooler is an Advanced Technology, induced draft counterflow design closed circuit cooler featuring EVAPCO's patented Sensi-Coil® technology - the most efficient in the industry. The counterflow design provides the ESWB Closed Circuit Cooler with inherently better operational and maintenance features. The ESWB is now standard with CTI Certified Performance including the Super Low Sound Fan option.

The standard design of the EVAPCO ESWB 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.

Principle of Operation

The pump is energized, and water is circulated up to the water distribution system. This starts with the large orifice EvapJetnozzles evenly distributing water as a thin film over the extended fill surface for maximum cooling efficiency. The fan system operates simultaneously, moving large volumes of air through the unit in a direction opposite thefalling water. The air and water contact directly across the fill surface whereupon a small portion of the spray water is evaporated. The warm and saturated air is then discharged from the unit dissipating heat to the atmosphere. 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.