ASHRAE Journal - June 2020 - 34

2020

ASHRAE TECHNOLOGY AWARD CASE STUDIES

F. Critical gallery distribution systems-In order to
protect galleries and collections, all water-conveying
systems were routed outside of the critical spaces. In
addition, low return air intakes provided good mixing of gallery air for even temperature distribution and
improved ventilation effectiveness. The results of distribution concepts moved most distribution systems to the
ﬂoor below the galleries.
G. Exhibit lobby and event space-A perimeter, underﬂoor system was utilized to condition the glazing-dominant lobby envelope load and high-occupancy space
from the critical temperature- and humidity-controlled
interior spaces. The distribution was completely concealed through a perimeter structural trench system.

Energy Efﬁciency

With the assistance of early phase and design reﬁnement energy models, the mechanical team guided
the design and owner team toward achieving early
energy-efﬁcient choices on architectural, lighting,
and mechanical systems. Glazing and wall systems
were appropriately energy efﬁcient and suitable for
FIGURE 2 Ground ﬂoor HVAC and piping isometrics. See "Mechanical System Description
and Schematics" section for details.
collections with R-20 walls, an
R-40 roof, triple-paned glazing in
galleries, and double-paned, lowSHGC glazing in the main lobby.
Additional modeling, using ANSI/
To Building
Systems
ASHRAE Standard 140-validated
IESVE software indicated that a
water-cooled chiller plant with
condensing boilers, direct-drive
high-efﬁciency fan arrays, and
advanced local controls were the
most effective baseline mechanical system for the new museum.
Further design reﬁnement models
FIGURE 3 Simpliﬁed heating and cooling plant schematic. See "Mechanical System Description and Schematics" section for details.
indicated that a heat-recovery
chiller system would create
from the modeled energy, with an operational EUI of
additional long-term savings by simultaneously
210.2 kBtu/ft2 (2387.1 MJ/m2). Actual performance is
serving base cooling loads while serving year-round
better than predicted performance, with cooling seareheat needs.
son results aligning with the model results. Winter
The ANSI/ASHRAE/IESNA Standard 90.1-2010 energy
results are signiﬁcantly improved based on operational
modeling results indicated a 35.8% energy savings
improvements with reheat energy and wintertime heat
and a 28.2% energy cost savings from the baseline
recovery chiller performance-those savings are being
model. Based on actual building operation beginning
investigated in detail to identify the complete extent of
in September 2018, the building's energy usage for the
operational savings.
ﬁrst full year of operation showed a further reduction
34

ASHRAE JOURNAL

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ASHRAE Journal - June 2020

Table of Contents for the Digital Edition of ASHRAE Journal - June 2020

Contents
ASHRAE Journal - June 2020 - Intro
ASHRAE Journal - June 2020 - Cover1
ASHRAE Journal - June 2020 - Cover2
ASHRAE Journal - June 2020 - 1
ASHRAE Journal - June 2020 - Contents
ASHRAE Journal - June 2020 - 3
ASHRAE Journal - June 2020 - 4
ASHRAE Journal - June 2020 - 5
ASHRAE Journal - June 2020 - 6
ASHRAE Journal - June 2020 - 7
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ASHRAE Journal - June 2020 - Cover3
ASHRAE Journal - June 2020 - Cover4
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