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TRG-TRC011-EN 21
period two
Absorption Chiller Types
notes
Double-Effect Chiller
The double-effect absorption chiller includes the same basic components as the
single-effect chiller; however, it also includes an additional generator, heat
exchanger, and pump.
The high-temperature generator can use steam or hot water (indirect-fired) as
the energy source, or it can use the combustion of a fuel such as natural gas or
oil (direct-fired). First we will discuss an indirect-fired, double-effect absorption
chiller. The direct-fired chiller will be discussed later.
Indirect-fired, double-effect absorption chillers are typically operated on
medium-pressure steam (approximately 115 psig [894.3 kPa]) or high-
temperature liquids (approximately 370°F [187.8 °C]). Typical COPs for these
chillers are 0.9 to 1.2.
condenser
condenser
high
high
-
-
temperature
temperature
generator
generator
evaporator
evaporator
absorber
absorber
low
low
-
-
temperature
temperature
generator
generator
Figure 24