Water treatment
ADOPT A PROVEN DOMESTIC APPROACH D
r Neil Watson, global technical director at ADEY, explains why the performance of commercial heating systems could be
greatly improved if the industry embraced the same approach to magnetic filtration and water treatment that’s been paying dividends for domestic systems for more than a decade.
The big issue Magnetite makes up more than 98% of all system debris, making it the single biggest cause of heating system issues. Due to the incredibly small size of magnetite particles – just eight microns (0.088mm) – they travel easily around a heating system, deposit in low flow areas such as heat exchangers, base boards and radiators, cause erosion in turbulent areas and clog up pumps. In homes, these damaging deposits can reduce heat transfer by as much as 15%, and reduce the efficiency of a boiler by 3%. The effects of magnetite aren’t unique to domestic central heating systems; it’s also a huge concern for those responsible for maintaining large scale and expensive commercial systems. So why is the type of filtration technology commonly used in commercial applications so different to that being used so effectively in the domestic sector?
System similarities Interestingly, the system components and materials used in commercial and domestic systems are effectively the same; the same metals, plastics and elastomers. They are also treated with exactly the same chemical inhibitor formulations. The only real difference is system size and flow rate. Commercial systems have traditionally relied on low efficiency bag filters and dirt separators. Due to the pressure drop that can be caused by these types of filtration solutions, they’re typically used in bypass applications. Unfortunately, these methods are prone to a high amount of ‘wash-off’; particularly bag filters, where small particles get continually rubbed against the bag until they become so small that they escape back into circulation around the heating system. Other commonly used filters rely on a mesh but it is possible that the magnetite particles are too small for them to be captured. Engineers are now switching on to the benefits of using magnetic filtration for long-term
maintenance and protection of commercial heating systems, yet there are many who don’t yet realise just how effective magnetic filters have been proven to be. This is because they offer maximum performance regardless of particle size, and even the smallest magnetic particles will be attracted to the powerful magnets at the core of the filter for collection and removal.
Chemical support Leading boiler manufacturers say that 85% of breakdowns are due to problems with system water. Similarly, pump manufacturers recognise that almost 70% of pump problems are also a result of the same issue. This is one of the reasons that ADEY developed its Best PracticeTM approach to heating system maintenance and protection. We know that magnetic filtration will be even more effective when supported by the use of premium quality chemical cleaners and inhibitors. In addition, we understand the importance of regular testing and checking to maintain the quality of the system water and guard against the build-up of magnetite. The adoption of this approach has been critical
in improving the performance of domestic heating systems, and we believe it can deliver even greater benefits for commercial systems.
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www.heatingandventilating.net
August 2017
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