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66 TRG-TRC016-EN
notes
period three
System Variations
Preferential Loading
To take full advantage of a high-efficiency, heat-recovery or alternate-fuel chiller,
the system may need a method to preferentially load these chillers. The
following two system configurations are variations of the primary-secondary
system.
In the basic primary-secondary system, all operating chillers are loaded to equal
percentages. In this first preferential-loading configuration, the preferentially-
loaded chiller is moved to the distribution side of the bypass pipe. This chiller
is preferentially (or most fully) loaded when it is turned on, because it always
receives the warmest system return water. In this example, an absorption chiller
is located on the distribution side of the bypass pipe so that it can be
preferentially loaded during periods of high electricity costs.
Preferential Chiller Loading
b
y
p
a
s
s
p
i
p
e
b
y
p
a
s
s
p
i
p
e
distribution
distribution
pump
pump
absorption
absorption
chiller
chiller
preferentially
preferentially
loaded
loaded
equally
equally
loaded
loaded
Figure 74