FAN COILS AND CHILLED BEAMS
wall opposite –or any other vertical barriers – to avoid ‘dumping’ air when it is in cooling mode.
Uncased or chassis units
High-level and low-level fan coil units together with horizontal units are also available in an uncased form. This allows the products to be fitted behind an architect’s façade which may have been designed to better blend in with the aesthetics of the conditioned space, an example being in the case of older buildings or rooms decorated in a traditional manner such as with wood panelling. ■ Fan coils are not only easy and practical to install they can also be easily moved/adjusted once installed to take into account design and load changes caused by a client’s changing requirements, for example, due to ‘office churn’.
■ Fan coil systems can be as simple or as sophisticated as a designer or client may require. The ability to control very small zones
to very tight tolerances is entirely practical. Alternatively, if the project does not demand sophisticated control simpler more cost- effective options are available.
■ It is entirely possible, and desirable, to make chilled water fan coils systems extremely efficient. Taking advantage of free cooling is just as possible with a fan coil system as it is with a passive or active chilled beam system.
To quote CIBSE’s TM43:2008 publication: ‘If used with a well-designed AHU a fan coil will only be surpassed by more expensive and less flexible systems such as chilled beams/ceilings in terms of CO2
emissions.’
To further endorse CIBSE’s statement, HEVAC’s Fan Coil Group commissioned a study to determine the difference in energy running cost between chilled beam systems and chilled water fan coil systems.
The study was based on a typical eight storey office building in London being modelled to give
realistic hourly heating and cooling loads. Two HVAC systems were created to calculate the fan coil and active chilled beam total annual energy consumptions so they could be compared.
The study determined that depending on the specific fan power of the fan coils, chilled water fan coil systems only used a fraction more energy as summarised as follows:
Terminal Fan % Above Active Specific Fan Power 0.3 0.2
0.15
Chilled Beam 2.87 1.52 0.85
When one takes the into account the further energy savings that can be made with demand ventilation, which is not possible with all other competing air conditoning systems, fan coil systems can offer one the best all round packages available on the market today.
www.acr-news.com www.hyd.hydratech c
.uk.co.uk kiinfinf @hydo@hydratech
co.uk.c .uk kttel: 01792 586800 June 2017 39
Specialist Fluid S olutions
Hydratech
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