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30 TRG-TRC011-EN
notes
period two
Absorption Chiller Types
Chiller/Heater
One of the benefits of a direct-fired absorption chiller is that it can be used to
provide both cooling and heating. These chillers, therefore, can be installed in
systems to supplement, or even replace, primary heating or domestic hot water
equipment. This can free up equipment-room space that was required for this
heating equipment.
In the direct-fired absorption chiller shown here, an auxiliary heating bundle
can be added, allowing the chiller to make hot water as well as chilled water.
The auxiliary heating bundle draws in a portion of the refrigerant vapor leaving
the high-temperature generator. Water flowing through the tubes absorbs heat
from this hot refrigerant vapor, causing the refrigerant to condense on the tube
surfaces. This transfer of heat warms the water to a temperature where it can be
used for comfort heating, domestic hot water needs, or process heating loads.
The key advantage of this design is that it can be configured to operate in
cooling only, heating only, or simultaneous cooling/heating modes. For
simultaneous operation, however, two separate sets of pipes are needed to
deliver chilled and hot water to the system.
auxiliary
auxiliary
heating bundle
heating bundle
hot
hot
water
water
high
high
-
-
temperature
temperature
generator
generator
refrigerant
refrigerant
vapor
vapor
Figure 35