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  How It Works


ED 2000:  Electronic Anti-Fouling System


A normal heat exchanger experiences scaling because the solubility of CaCO3 decreases with temperature.  This inverse solubility law is true not only for CaCO3 but also for other scale-forming minerals in all chiller applications, condenser tubes, and process heat exchangers.  The temperature is highest right on the heat exchanger surface, which is where scale forms.





As shown in the figure above, normally CaCO3 is dissolved in water in the form of calcium ions and bicarbonate ions.  When they arrive at a high temperature environment, they precipitate out of solution in the form of CaCO3 crystallization (calcite or aragonite) and sick to the heat exchanger surface.  Over time as the scale bakes on the heat exchanger, heat transfer efficiency decreases dramatically and energy loss occurs. Yearly maintenance using brush-punching or acid-cleaning to remove this hard scale deposit becomes increasingly expensive.


The ED 2000 Electronic Anti-Fouling System solves many of these cost issues by forcing the calcium and bicarbonate ions to precipitate out in the bulk solution rather than on the heat exchanger. Bulk precipitation produces seed crystals in water as shown below. These seed crystals absorb calcium ions keeping them away from heat exchangers. Scaling is prevented.





ED 2000 achieves this by means of induced molecular agitation of the dissolved ions. The ED 2000 Controller generates a square wave electric current that changes directions 500 times per second and channels that current through the Clamshell Coil. The Clamshell is a solenoid that is wrapped around the pipe and creates a magnetic field inside of the pipe. Because the magnetic is changing directions 500 times per second, this induces an electric field in a clockwise/counterclockwise direction as shown below.



The induced electric field (E) is caused by the changing magnetic field in what is known as Faraday's Law - a basic scientific principle. Negatively charged bicarbonate ions move in one direction when positively charged calcium ions move in the opposite direction. Because of these collisions, calcium carbonate precipitates in the bulk solution forming seed crystals in the water which further absorbs calcium ions and prevents scaling.

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