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34 TRG-TRC016-EN
notes
period two
Chilled-Water System Design
Multiple-chiller systems are more common than single-chiller systems for the
same reason that most commercial airplanes have more than one engine—
redundancy provides reliability. Additionally, because cooling loads typically
vary widely, multiple-chiller systems can often operate with less than the full
number of chillers. During these part-load periods, the system saves the energy
required to operate the additional chillers, pumps, and, in water-cooled
systems, cooling tower fans.
There are several configurations used to connect multiple chillers in these
systems. Some of these configurations work well, others do not. Next, we will
look at the most-commonly-used system configurations, including their
advantages and drawbacks.
Multiple-Chiller Systems
▲ Redundancy
▲ Part-load efficiency
Figure 40