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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.
Pressurized Water Distribution System

The water distribution system is made of schedule 40 PVC pipe and ABS plastic water diffusers for corrosion protection in this key area. The piping is easily removable for cleaning. The water diffusers have a minimum opening of 1 1/4 by 5/16 inch (31,8 by 7,9 mm) and are practically impossible to clog. They also have an anti-sludge ring extending into the headers to prevent sediment from building up in the diffuser opening. In addition, the spray branches have threaded end caps to allow easy debris removal.

The water distribution is designed to provide a minimum 6 GPM over each square foot (4 liters per second over each square meter) of unit plan area to ensure proper flooding of the coil.