Chilled Water Fan
Coil Units. This system of comfort cooling uses a centralized
chiller to produce cold water. This water is then distributed to room based fan
coil units (below figure). The fan coil units provide cooling in a similar
manner to split system indoor units. The difference is that the heat transfer
coil is filled with cold water instead of refrigerant. The units can be floor
or wall mounted or recessed into a suspended ceiling.
There are a number
of advantages to this system:
· Fewer constraints
on the number of room based units
· The distribution
system uses chilled water instead of refrigerant. As a result part of the
system can be installed by tradesmen used to water systems as opposed to
specialist refrigeration engineers.
· Chilling and heat
rejection occurs in the centralized chiller. This may be in a plant room or on
the roof top. The charge of refrigerant is therefore reduced and since the
lengths of refrigerant pipe work are shorter the risk of leakage is diminished.
· Use of hydronic
circuits and low fan speeds results in quiet operation making the units useful
for noise sensitive locations.
