HVAC & REFRIGERATION SHOW PREVIEW Conventional air conditioning impacts
signifi cantly on a building’s operating costs as it uses in excess of 25% of the building’s energy consumption. It therefore makes sense to employ Evaporative Air Cooling, a far more energy effi cient system, to create a pleasant environment for workers to maximise productivity whilst at the same time minimising energy costs. What if the ambient air (outside the building) is cold and, instead, the air inside the building is extremely hot? This is the case for many manufacturing companies, where the heat coming from the machines is really high. Evaporative cooling units feature a powerful fan, which can also be used in fan only mode, without water, to blow fresh air through the vents. It is important to remember that cooled air inside the building is not recirculated, so doors or windows must be left open for this air to escape, or extraction fans need to be installed. This can be a great solution to improve indoor air quality in production areas where fumes and germs are involved. In cases where businesses have traditional cooling systems installed, they rely on recirculating the air in the indoor space, and the stale air can contain fumes and germs. Evaporative air coolers blow inside the building
100% fresh air from outside and actually fi lter the incoming air, removing most airborne dust and pollen particles. The wet cooling pads trap most of these particles, which are washed down into the sump by the circulating water.
Often, commercial or industrial buildings have small spaces that are hot and uncomfortable to work in. These hot spots can be caused by heat from machines, heat from manufacturing processes, large numbers of people, or trapped hot air behind large glass windows. Often these spaces are not just hotter than the surrounding interior areas of the building, but hotter than the external conditions too. A better, more intelligent solution, is to use Evaporative Air Cooling to blanket the hot spot with a fl ow of cool, high velocity, fresh air, designed to impact your workers whenever they are in that hot location. This is called ‘Spot Cooling’.
Evaporative air coolers are extremely simple to install and maintain. Cooling pads need checking and cleaning regularly (once a year or every six months depending on the pollution levels in the environment) and cleaning can be done just using water. People erroneously connect evaporative air coolers with Legionnaires’ disease, but properly maintained evaporative coolers will not transmit
the disease because they produce no aerosols. Evaporative coolers should not be confused with cooling towers or evaporative condensers, which involve diff erent technology.
Secondly, in a quality evaporative cooler, water is drained from the unit when it is not required, so there is no standing water to rise to ambient temperature.
Above all, however, well designed evaporative coolers do not produce any aerosol, meaning that even if Legionella bacteria were present in the cooler, there is still no mechanism there to transfer them to humans. Moreover, there are no recorded cases of an evaporative cooler causing Legionnaires’ disease and research indicates transmission of the bacteria is not possible by the evaporative method.
Being so simple to install and maintain, these coolers are taken on board by a rising number of installers in the UK, which see in the product a real business opportunity, fi rst of all because they are extremely cheap to run and therefore more and more companies are willing to install such systems; secondly, because evaporative cooling is extremely environmentally friendly and is based on a natural technology to cool the air without damaging the planet.
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December 2017 21
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