ASHRAE Journal - December 2023 - 56

HONORABLE MENTION 2023 ASHRAE TECHNOLOGY AWARDS
systems for the central plant crew and avoids the need
to closely monitor a potential 10 in. (254 mm) bypass
control valve in a variable primary-only system. This
possible robust pressure-independent valve would
become a critical device to balance between the chillers'
load and the complexity distribution load in a large yet
versatile facility.
The same concept applies to condenser water systems
and the heating hot water system that generate
a capacity reduction in VFDs of each associated
system's pump.
The energy stored in the extensive 20 in. (508 mm)
chilled water main piping network can be realized as
thermal mass to support off-hours secondary (24/7)
cooling for up to 12 hours. A tertiary local pump is set
up for the computer room units and tele/data closet fan
coil units to serve the transformers, VFDs, electronic
equipment, etc. These tertiary pumping systems fully
use the stored cooling energy without the primary
mechanical refrigeration system operation for 24/7
cooling needs during off hours and without operating
CASE STUDY
the main secondary distribution pumps. The tertiary
pumps are also backed up on an emergency power
network. This design approach reduces the need for
emergency power to the main chiller plant including
the chillers, chilled water primary/secondary pumps
and cooling towers. Emergency power for mechanical
equipment is provided only to critical 24/7 cooling units,
associated in-line tertiary pumps and code-mandated
exhaust fans.
The variable air volume single zone air distribution
approach serving each of the four Exhibition Hall
subdivisions interacts with the dynamic and flexible
load conditions with a reduction in cfm as well as
adjustable discharge air temperature when needed to
meet low demands. The medium pressure variable air
system serving the main 150 ft (46 m) tall south lobby
also uses the colder air distribution concept, discharging
50ºF (10°C) air and dynamically adjusting system flow/
temperature in response to occupancy and loads.
For more information, visit https://tinyurl.com/
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56
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ASHRAE Journal - December 2023

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