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14 TRG-TRC016-EN
notes
period one
Types of Water Chillers
The final configuration includes a packaged compressor-and-evaporator unit
that is located in an indoor equipment room and connected to an indoor,
air-cooled condenser. The air used for condensing is ducted from outdoors,
through the condenser coil, and rejected either outdoors or inside the building
as a means for heat recovery. Indoor condensers typically use a centrifugal fan
to overcome the duct static-pressure losses, rather than the propeller fans used
in conventional outdoor air-cooled condensers. Again, the components are
connected with field-installed refrigerant piping.
This configuration is typically used where an outdoor condenser is
architecturally undesirable, where the system is located on a middle floor of a
multistory building, or where vandalism to exterior equipment is a problem.
A disadvantage of this configuration is that it typically increases condenser fan
energy within compared to a conventional outdoor air-cooled condenser.
Similarly, a packaged cooling tower in a water-cooled system can also be
located indoors. This configuration also requires outdoor air to be ducted to
and from the cooling tower, and again, typically requires the use of a centrifugal
fan. Centrifugal fans use about twice as much energy as a propeller fan, but can
overcome the static-pressure losses due to the ductwork. Alternatively, the
tower sump can be located indoors, making freeze protection easier.
Indoor Air-Cooled Condenser
condenserless
condenserless
chiller
chiller
indoor
indoor
air
air
-
-
cooled
cooled
condenser
condenser
refrigerant
refrigerant
piping
piping
Figure 17