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88 TRG-TRC016-EN
notes
period four
Chiller-Plant Control
The system might also benefit from having a heat-recovery chiller fully loaded.
As discussed in Period Three, to maximize the amount of heat recovered, it is
often desirable to preferentially load that chiller, sequencing it as a base
chiller—“first on” and “last off.” Other chillers can then be turned on when the
heat-recovery chiller cannot handle the cooling load alone.
A variation on this idea is an absorption chiller fueled by waste heat. It is
preferentially loaded to handle as much of the cooling load as possible before
turning on other chillers. The absorption chiller would be sequenced as a base
chiller to make use of the free energy operating this chiller.
Heat Recovery
preferentially
preferentially
-
-
loaded
loaded
heat
heat
-
-
recovery
recovery
chiller
chiller
standard
standard
electric chillers
electric chillers
Figure 96