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110 TRG-TRC016-EN
1 Centrifugal, helical-rotary, reciprocating, and scroll
2 Air-cooled chiller advantages include lower maintenance costs, a pre-
packaged system for easier design and installation, and better low-ambient
operation. Water-cooled chiller advantages include greater energy efficiency
(at least at design conditions) and longer equipment life.
3 False. The IPLV equation was derived to provide a representation of the
average part-load efficiency for a single-chiller system only.
4 Three-way modulating control valve, two-way modulating control valve,
and face-and-bypass dampers
5 When only one chiller is operating, warm return water continues to flow
through the non-operating chiller and mixes with the chilled water leaving
the operating chiller. The temperature of the mixture of these two streams
is higher than the desired supply-water temperature, possibly resulting in
building comfort or space humidity control problems.
6 Constant; variable
7 Two-way modulating control valves
8 Turn on
9 To ensure that the water flow through the system remains above the
minimum flow limit of the operating chiller(s)
10 Preferential loading is typically most beneficial in the following scenarios:
n In a system that has a high-efficiency chiller along with several
standard-efficiency chillers, the high-efficiency chiller can be
preferentially loaded to reduce system energy consumption.
n In a system with a heat-recovery chiller, preferentially loading the
heat-recovery chiller maximizes the amount of heat recovered, thus
reducing the overall system energy consumption.
n In a system with an alternate-fuel chiller, such as an absorption chiller,
preferentially loading the alternate-fuel chiller during times of high
electricity costs minimizes system energy cost.
11 The swing chiller is alternated on and off between the larger chillers'
operation, in order to serve as a smaller incremental step of loading.
This sequence more favorably matches the capacity of the chiller plant to
the system load and operates the fewest, and smallest, pieces of ancillary
equipment (pumps and cooling towers) at any system load.
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