Civil Engineering Reference
In-Depth Information
sources that can indirectly increase the energy consumption of the system. The
small energy consumed by low-voltage power provided for control valves and
dampers, and the power input to the variable frequency drives for supply and return
fans that can be factored in supply and return fan consumption itself are the other
sources of energy consumption.
8.13.8
Active Chilled Beams
Chilled beam systems are usually used for cooling and ventilating spaces. Active
chilled beams (Fig.
8.16
) include a heat exchanger for cooling that can be used for
heating if needed as well. If the internal humidity load of the space is not high,
Chilled beam systems are very effective. Active chilled beams are connected to both
the air handling supply air ductwork, and the chilled water system. The air handling
unit supplies primary air into the various rooms through the chilled beams. As air
supply is forced to the room through the chilled beam diffusers, it causes the induc-
tion of the room air back through the heat exchanger of the chilled beam. Two
streams of the air then mix together, and the mixture goes over an auxiliary cooling
Fig. 8.16
Active chilled beams
