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Adiabatic cooling towers cut energy consumption & maintenance.

New EarthSmart adiabatic cooling towers from Conair, Cranberry Township, Pa., reportedly cam reduce water and energy consumption and prevent contamination of process fluid (water and 35% ethylene glycol), while maintaining stable fluid supply temperatures even in hot weather. Process fluid circulates in a closed loop through tubing in the tower, so it is isolated from contamination and evaporation. Eleven models are available to handle nominal flow rates from 45 gal/min (170 l/min) up to 510 gal/min (1930 l/min) of process fluid.

Adiabatic wetted panels are mounted in front of the tower coil through which process water flows. As ambient air passes through the wetted panels, water evaporates, reducing the temperature of the air flowing into the unit so that it cools the process fluid. Towers can be operated without using the adiabatic process (relying on ambient air to cool the coils) when air temperatures are low. This saves water and energy. By using the adiabatic process only when it is absolutely required during periods of high outdoor temperatures, the unit reduces water consumption to just a fraction of what conventional towers use.


The process circuit is a closed loop. All evaporation and water consumed in the adiabatic process are external to the process loop, so process-fluid contamination and unwanted buildup in mold-cooling channels are eliminated. The closed process loop also allows an ethylene-glycol mix to be used in place of plain water, which helps prevent freezing during cold weather.

An application-specific PLC and electronically commutated (EC) motors on EarthSmart towers are said to ensure minimal electrical power use. "Smart-fan" technology varies speed to minimize energy consumption when the tower is under partial load. The PLC also controls when the adiabatic process is required to maintain accurate fluid supply temperature and reduce water use.

(724) 584-5500 *

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Title Annotation:HEATING/COOLING
Publication:Plastics Technology
Date:Aug 1, 2014
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