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day it would evaporate 20,160 pounds per day (2,414 gallons). In order to help reduce the buildup of solids, it has been a long- held practice to blow down one gallon of water for every gallon evaporated. In many municipalities, blowing down so much water can be expensive, not to mention wasteful. For this reason it is essential that you consult a reliable water treatment company in your area to choose the most efficient course of action for your particular water conditions. Effective water treatment will keep your scale buildup under control, improve system efficiency and reduce the amount of water that is blown down the drain. Baltimore Air Coil has recently launched a new series


of condensers that addresses the problem of scaling on the condenser coil through their adiabatic design TrilliumSeries condenser. Rather than have water directly evaporating on the condenser coils and depositing minerals, the evaporation takes place on a media material that stands off from the condenser coil itself. Any minerals left behind would be held in suspension and mostly wash away with the blown-down water. Occasional cleaning of the sump is still required. Another recent movement afoot in the refrigeration industry


is the trend to reduce refrigerant charges to improve safety and the exposure to financial loss common in the past when large refrigerant charges were occasionally lost due to leaks. Te new BAC TrilliumSeries condenser includes a new extended surface microchannel coil design rather than the traditional larger round tubes. Tis proves advantageous as it only requires water on the hottest of days and also reduces on the condenser refrigerant charge by about 90 percent. In an effort to further reduce refrigerant charges, new


self-contained, completely packaged ammonia systems with refrigerant charges of less than 100 pounds are now available. Te condensers on these packages are either plate and frame or totally sealed plate and shell with the heat being directed outdoors to evaporative cooling towers or fluid coolers. Te added heat exchange imposed by a closed loop fluid cooler must


Scaling on the condenser coils results in reduced efficiency.


New self-contained, high efficiency ammonia systems with refrigerant charges less than 100 pounds are now available.


be accounted for in the design process in order to minimize efficiency loss to the system. Tis design style offers the advantage of zero scaling left on the condensing surface. Being that the heat is transferred directly from the condenser into a glycol solution, it makes it easy to use up to 100 percent of the waste energy for building heating systems, with no need to add any more refrigerant heat exchangers. New fluid cooler technology designs are also taking advantage


of the evaporation of water. Tese adiabatic fluid coolers have a very large finned heat transfer coil that requires no water on the majority of the days year-round. On extremely hot days, water is atomized into the entering air stream, cooling through evaporation resulting in no mineral condensing on the coil itself. Te fan motors are speed controlled electronically commutated and only absorb enough power to maintain the required condensing temperature. Low speed fans combined with sound reduction fan blades keep the sound level to a minimum. It is nice when challenges create opportunities. Tat has been


the case over the last few years when it comes to condensers where operational problems and regulatory issues can be solved simultaneously. With the new adiabatic condensers and fluid coolers, we no longer have to deal with scaling on coils, wintertime freeze-ups and high water consumption, plus we are able to utilize more efficient, packaged systems with greatly reduced refrigerant charges, which helps solve regulatory and safety issues.


Art Sutherland is the founder and president of Accent Refrigeration Systems, which specializes in the design, manufacturing, and installation of high efficiency mechanical systems for the ice rink industry.


ISI EDGE SUMMER 2016 9


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