Eddy Current and the Magnetic Fields...Now Playing...
Two of the centrifugals I service are on a Dolphin system.
It kinda sorta works, but you need to be able to remove the solids that will drop out in places including the tubes. It will work better in towers with a V shape along with a cyclonic separator. With flat bottomed towers you would need to suck out the gunk or install the cyclonic separator and a pump with some spray trees in the tower to kick up the solids and get them out. I'd lean away from sand filters. Bags might work if you cleaned them a lot.
There are other concerns such as white rust in a new system, and how well it deals with the sulphate reducing bacteria like the bugs that make the blisters with bright metal underneath.
So far we have to clean the tubes every year, and the pay off compared to our standard phosphonate based tower treatment with a Bromine biocide pencils out to far beyond the expected life of the unit.
The guy who invented the thing now works for Evapco, and they have their own version.
If they get it to work and pencil out, the green frenzy will beat a path to their door. At this time, however, I could neither recommend or condemn the Dolphin.
Chemical Free Systems & Air Intake Filter Screens
Here's a chemical free water treatment system that is worth checking out - it's called the VRTX system - the way it works is that water is drawn from the Cooling Tower or Evaporative Condenser sump. The water is spun at high velocity in apposing directions then the two streams collide with tremendous kinetic energy and shear. At the core of these streams, a region of near total vacuum is created which degasses the flow; Under these conditions, hydrodynamic cavitation occurs causing intense temperatures (up to 9,000°F) (kinda like colliding atoms together) - Simply stated it causes debris to become emulsified.
However, no matter how well the chemical free technology works there are still drawbacks such as they do nothing to manage airborne debris that gets into the fill nor do they solve the problem with algae which grows in the interior regions of the tower exposed to sunlight. Another thought when trying to help customers solve their water quality problems is to keep in mind that 90% of the bio-loading is caused by airborne debris pulled into the intake opening and that using chemical free water treatment and side stream filtration only manages the debris after it gets into the tower. An important part of managing water quality is managing the airborne debris which gets into the tower - Use of air intake filter screens will stop most airborne matter from getting into the cooling tower thus enabling either chemical or chemical free water treatment systems to perform more effectively. Also, because air intake filter screens shade the tower it thwarts the photosynthesis process by difusing the sunlight which algae needs as its energy source for growth - when air intake filters are used in conjunction with chemical water treatment, it also enables the reduction in bromine solutions frequently used to help manage tough algae problems. In short, air intake filter screens can help stop airborne debris from getting into the systems in the first place thus increasing the effectiveness of water treatment systems through the significant reduction in bio-loading. If however the primary problem is water borne debris, then filter screens can't help and it's up to chemistry, or chemical free systems and side stream filters to solve the problem.