During the last decade, the technology for
chilled beams has been refined and improved and has been more widely
As well as reducing energy consumption, chilled beams improve comfort
levels by lowering the potential for draughts and cutting out the
intrusive noise and aesthetic problems associated with more conventional
solutions, such as mechanical ventilation and air conditioning.
The fact that chilled beams are water-based
systems makes them environmentally attractive, and because they are
unobtrusive installations, they free up more valuable office space for
occupation and use.
Chilled beams and chilled ceilings are not appropriate for every
building project, but there are a number of applications where they are
ideal like in:
Controlling Chilled Beams
Altering the rate at which air is supplied via an active chilled
beam is one method of controlling the output, reducing potential over
cooling and meeting C02
requirements in spaces.
Another is to vary the temperature of the air
supplied. Condensation detectors should be considered to ensure that
condensation does not occur.
Also that the total air supply to the space can
deal with the design range of floor occupation density within the
comfort criteria specified.
Chilled beams and ceiling systems are
typically designed to use the dry cooling principle by selecting the
ventilation rate, supply air conditions and chilled water flow
temperature so that no risk of condensation exists.
The space air dew point temperature should be
around 2° C lower than the flow temperature of chilled water in the
ceiling or beam system.
The following precautionary control can be
implemented in the BMS to avoid condensation:
Space relative humidity is monitored to ensure the chilled water flow temperature is
controlled above the calculated dew point.
Condensation sensors can be utilized to shut off
the chilled water supply when condensation is detected, this is
recommended, especially when windows are openable to external air.
In the absence of condensation sensors, openable windows should
be equipped with window switches that trigger chilled water control
valves to shut-off.
Difference between WCD2 and WCD single:
VFC and current output
Only VFC output
No LED indication