 Patented* Thermal-Pak® Coil
EVAPCO's Thermal-Pak® coils feature a patented design which assures maximum cooling capacity. The airflow through the coil is counterflow to the fluid flow, providing the most efficient heat transfer process. A special coil design is utilized to reduce the air pressure drop through the unit while maximizing tube surface area and increasing its heat transfer capabilities. The uniquely shaped tubes of the coil are staggered in the direction of airflow to obtain a high film coefficient.
The coils are manufactured from high quality steel tubing following the most stringent quality control procedures. Each circuit is inspected to assure the material quality and then tested before being assembled into a coil. Finally, the assembled coil is pneumatically tested at 400 psig (2758 kPa) 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 (427ºC).
Note: Closed circuit coolers should only be used on sealed, pressurized systems. Continual aeration of the water in an open system can cause corrosion inside the tubes of the cooler leading to premature failure.
*U.S. Patent No. 4,500,330
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The UBW is an Advanced Technology, induced draft counterflow design closed circuit cooler featuring EVAPCO’s
patented THERMAL-PAK COIL® – the most efficient in the industry, and dramatic advancements in structural
technology to withstand the greatest forces of nature. Constructed with structural enhancements like heavier gauge steel,
increased size and number of fasteners, reinforced mounting flanges and internal cross-bracing, the UBW line can withstand
seismic accelerations up to 1.0g horizontal and wind loads of 125 psf. Stone and Webster, using computer modeling and actual
proof tests independently certified the seismic and wind load rating of each model. In addition, the counterflow design
provides the UBW closed circuit cooler with inherently better operational and maintenance features. These features are described below.