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SERVICE AND MAINTENANCE 


 


which dramatically cut the amount of water required – up to five times less volume – while still complying with the BSRIA guidelines. As well as using less water, this process is also much faster than traditional flushing, slashing cleaning times and saving on labour costs.


Flushing can also take place when changes are made to the system, which wastes water and also disrupts the chemical balance, as well as potentially adding oxygen – a pre-cursor to corrosion.


In-line filtration is a good alternative treatment here, retaining existing water in the system to prevent the wastage of many thousands of litres of new water, while eliminating the need for the addition of extra inhibitors to replenish the chemical make-up.


Real-time results


The key way to reduce water and chemical wastage and enhance the efficiency of a water system is 24/7 monitoring.


Unlike sampling, results are constant and instantaneous and, crucially, if using Hevasure’s monitoring technology, dissolved oxygen is identified. If O2 levels are checked, corrosion can be nipped in the bud before it takes hold and the conditions for bacteria proliferation can be prevented. Hevasure also detects corrosion rates, inhibitor levels, pH and pressure.


This knowledge and quick reaction to potential issues is a very important part of improving the sustainability of water treatment. By preventing corrosion, water systems stay in peak condition, therefore ensuring that the HVAC plant relying on them works as efficiently as possible. And, where works have to be carried out, either as part of routine maintenance, or where a system is added to, water condition can be closely monitored to ensure it returns to base levels quickly, therefore avoiding the unn ecessary


use of flushing and chemicals. Open circuit cooling Open circuit cooling


Cooling towers are often open circuit, which means the risks extend beyond the system itself to the wider world – namely the potential threat of Legionnaires’. This can lead to an overuse of chemicals which, as mentioned, can be extremely damaging to pipework and associated equipment.


The first step in reducing chemicals is trying to avoid reactive maintenance where possible, ensuring works are


planned and plant is kept in good condition.


There are also non-chemical water treatment solutions that can dramatically cut the need for chemicals – ideal for systems where keeping dosage correct is an issue. Low-volume systems, for example, have a high turnover rate of water. This constant disruption means automated dosing is


sometimes not sensitive enough to treat the water correctly.


We use Advanced Oxygenation Technology (AOT), which is proven to kill 99.9999% of Legionella bacteria naturally, using a specific frequency of light. In one example, by using AOT a cooling tower customer reduced their chemical costs by 47% over a year, saving around £3,000. Water usage was also reduced by around 20%.


Maintenance matters


Whether closed or open circuit, by having a better handle on system condition, preventing rather than reacting to issues and employing the latest water and chemical saving technologies, sustainability and also maintenance practices are improved.


Any mechanical system that is looked after properly, reducing unnecessary impact where possible, will break down less and cost less to run.


In a HVAC system, this also leads to improved system efficiency, saving energy and yet more costs.


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