All Evapco closed circuit coolers now include Crosscool, an internal tube enhancement that the company says increases the heat transfer rate and overall thermal capacity.

The enhanced coils have tubes with an embossed internal surface instead of the traditional smooth-bore tube design. This ridged surface adds more surface area within the coil, which in turn increases the turbulence of the fluid passing through it and raises the internal heat transfer coefficient.

According to the company, Evapco closed-circuit coolers with Crosscool coils have an average 4 percent increase in thermal capacity over previous smooth-tube closed circuit coolers of the same footprint and fan motor horsepower.