ASHRAE Journal - July 2022 - 50
ASHRAE TECHNOLOGY AWARD CASE STUDIES
required (80,000 cfm [37 756 L/s] versus 40,000 cfm
[18 878 L/s]).
Innovation
Teaching classrooms are located on the south of the
building. This " decoupled " space programming allowed
for the Commons to be used as an " air share " plenum
where the exhaust/return air from the teaching classrooms
is transferred without the need for exhaust
ductwork and VAV boxes. Quiet teaching labs use active
chilled beams with no moving parts to limit noise generation.
Fire/smoke dampers and sound attenuators were
provided for each teaching classroom transfer opening
above the ceiling into the commons.
The systems are also designed for fl exibility and
adaptability to accommodate rapidly changing convergent
science teaching and research. The chilled beam
design allows for wet labs to be converted to dry labs by
altering the general exhaust and makeup air quantities.
No physical changes to the distribution system
(ducts, chilled beams, air valves, etc.) are required.
This standardization and fl exibility ensures that the
energy performance is not compromised in future
modifi cations.
Cost Effectiveness
When evaluating costs between a code-compliant VAV
system and the ILSB neutral air chilled beam system, the
ILSB system in air-handling unit cost is greater (approximately
$13/cfm compared to $9/cfm) given the custom
construction and dual energy wheels associated with
the design. However, the overall airfl ow to the building
is drastically reduced, as well as the peak heating and
cooling loads associated with the central plant. Sheet
metal sizes and fi rst costs are signifi cantly reduced as
well. This can result in an overall lowering of the building
height. When accounting for all of the energy-saving
features and fi rst-cost drivers of each system, an overall
cost add of $740,750 was included on the ILSB proposed
HVAC system. The annual energy savings as compared
to the baseline building total $299,582. This results in a
simple payback of 2.5 years.
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ASHRAE Journal - July 2022
Table of Contents for the Digital Edition of ASHRAE Journal - July 2022
Contents
ASHRAE Journal - July 2022 - Intro
ASHRAE Journal - July 2022 - BB1
ASHRAE Journal - July 2022 - BB2
ASHRAE Journal - July 2022 - Cover1
ASHRAE Journal - July 2022 - Cover2
ASHRAE Journal - July 2022 - 1
ASHRAE Journal - July 2022 - Contents
ASHRAE Journal - July 2022 - 3
ASHRAE Journal - July 2022 - 4
ASHRAE Journal - July 2022 - 5
ASHRAE Journal - July 2022 - 6
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ASHRAE Journal - July 2022 - Cover3
ASHRAE Journal - July 2022 - Cover4
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