AIR CONDITIONING


rates automatically to occupancy levels, regardless of pressure changes in the ductwork system. Occupancy levels are rarely at 100%, hence o ver cooling is the common complaint with CAV c hilled beams systems operating on proximity sensing.


V entilation levels in office areas need to be turned down to match occupancy levels. VAV chilled beams with simple CO 2 sensing would provide the required demand control at highest comfort levels.


For cellular (single person) offices an alternative solution would be fan coil units (FCUs). This type of system is best suited to o ffices with a primary requirement of cooling above 160w/m², or where humidity levels cannot be controlled.


FCUs have become more efficient in recent years, especially since legislation driving the introduction of electronically commutated (EC) motors was introduced. For this reason, they r emain a popular choice. FCUs can easily adapt the room comfort system to new layouts and their flexibility appeals to building and system d esigners. However, they generally have slightly higher installation and maintenance costs compared with chilled beams. That is because


more important than ever for facilities managers to be aware of the cooling and


s


ventilation options available to them and how to d ecide between them.


Today, chilled beams can be used to achieve a comfortable environment with minimum energy


c onsumption. They offer high indoor air quality and ease of installation and maintenance, while also being highly flexible so they can be easily a dapted to suit any future modifications of a building’s layout.


DAPUK


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