The eco-LSWE and eco-LRWB series from EVAPCO, Inc. are closed circuit coolers. These energy and water efficient forced draft coolers are suitable for indoor applications with confined layouts, low height, and low-sound requirements.
The eco-LSWE is a centrifugal fan design closed circuit cooler with a capacity range of 282 MBH to 14,097 MBH (83 kW to 4,129 kW). The eco-LRWB is a centrifugal fan design closed circuit cooler with a capacity range of 221 MBH to 4,039 MBH (65 kW to 1,183 kW).
Both closed circuit coolers can replace existing forced draft equipment of the same box size and fan motor horsepower, and provide up to an additional 30% in evaporative thermal capacity. Due to this increase in capacity, the footprint, height, and horsepower can all be reduced for the same load. Furthermore, the patented Ellipti–fin® coil design with CROSSCOOL internal tube enhancement allows for dry operation at significantly higher ambient conditions, saving water when only the fans are required for sensible cooling. All coil rows feature the finned Thermal-Pak® elliptical tube design that results in lower airflow resistance than typical finned round tubes.
The CROSSCOOL internal tube enhancement increases the heat transfer rate and overall thermal capacity in all coil products. CROSSCOOL-enhanced coils feature tubes with an embossed internal surface, rather than 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. With CROSSCOOL-enhanced coils, all EVAPCO closed circuit coolers now have an average 4% increase in thermal capacity over previous smooth-tube closed circuit coolers of the same footprint and fan motor horsepower.
With the eco-LSWE and eco-LRWB, the process fluid is circulated through the coil of the closed circuit cooler. Heat from the process fluid is dissipated through the coil tubes to the water cascading downward over the tubes. Simultaneously, air is blown through the unit by the fans and travels upward over the coil opposite the water flow. A small portion of the water is evaporated which removes the heat. The warm moist air is forced to the top of the closed circuit cooler by the fan and is discharged to the atmosphere. The remaining water falls to the sump at the bottom of the cooler where the pump recirculates it up through the water distribution system and back down over the coils.
Centrifugal units are recommended for a wide range of installations. They are quiet, can easily be hidden, and are a solution for installations where sound is sensitive, and when the unit must handle external static pressure. The eco-LRWB has a fan section located beside the heat transfer casing to satisfy even the strictest of height requirements in a unitary, compact design.
The eco-LSWE and eco-LRWB are provided with an efficient drift eliminator system that effectively reduces entrained water droplets from the air discharge to less than 0.001% of the spray water flow rate. The eliminators are constructed of non-corrosive PVC with a multi-pass design for maximum drift reduction. They are assembled in modular sections for easy removal and access to the water distribution system. In addition to reducing drift, the eliminators also function as effective screens which protect the spray system from sunlight and debris.
All eco-LSWE and eco-LRWB closed circuit coolers can be installed indoors where they normally require ductwork to and from the unit. The design of the ductwork should be symmetrical to provide even air distribution across both intake and discharge openings.
The eco-LSWE and eco-LRWB are available with either a Pulse~Pure® non-chemical or a Smart Shield® solid chemical water treatment system. The systems include all components required for an effective water treatment system and are factory mounted and wired.
The eco-LSWE and eco-LRWB closed circuit coolers are optional with the Sage2® Control System. The system contains a Programmable Logic Controller (PLC) with adaptive logic, which allows the operator to select either a priority for maximizing water or energy efficiency. Real time load and weather data are measured and recorded by the PLC and sensors. This data is then analyzed and used to switch the unit between the various modes of operation. If the panel is set to operate in the water savings priority, the Sage Panel will vary the unit between the Dry and Evaporative modes of operation, limiting the time spent in the evaporative mode to maximize water savings. If the panel is set to operate in the energy savings priority, the Sage Panel will switch the unit between the Dry and Wet modes of operation, controlling the fan speed and pump operation in an effort to maximize energy savings.