ASHRAE Journal - April 2020 - 47

2020 ASHRAE TECHNOLOGY AWARD CASE STUDIES

The second Environmental and Natural Resources
Building (ENR2) at the University of Arizona houses
academic departments and interdisciplinary programs
related to the study of earth sciences, natural resources,
and the environment. A design brief, published in 2012,
laid out a set of aspirational goals for a building that
would promote interaction and collaboration among its
occupants, students, and the community at large, and
would reflect the university's stewardship of its energy
and water resources. It was completed in Summer 2015,
and achieved USGBC LEED NC v3 Platinum certification.

View of Slot Canyon's central stairway.

The building is centered around
a stunning, five-story "canyon,"
formed of sinuous inward-facing,
planted balconies connected by a
winding staircase. Roof drainage
spills down through open pipes
to a collection system below the
landscaped canyon floor, creating
a vibrant visual and auditory experience when it rains. Since initial
occupancy in the fall of 2015, the
building has proved to be extremely
popular among the university community, and is routinely scheduled
not only for class, dry lab, and
lecture, but also for campus-wide
conferences and special events that
include awards ceremonies, Sunday
worship, and even an open-air
opera.
The 207,632 gross square foot
(19 290 gross square meter) building (Figure 1) is formed of two blocks
oriented along the east-west axis of
the central canyon. The first floor
includes two large lecture halls,
café, and the public interaction
space on the canyon floor. Floors 2
through 5 contain primarily closed
perimeter offices, open center office
bays, and conference/dry-lab spaces

in "pods" constructed along openair collaboration space within the
balconies and at the rooftop level.
Green-roof landscaping technologies were applied at the balconies
and sections of the upper-deck to
enable a thriving population of
desert plants suited for the arid climate of the Sonoran Desert. These
are sustained through an irrigation
system fed from the underground
rainwater cistern or, during the
dry periods, municipal reclaimed
water. After three years, plant
materials throughout the space are

Building at a Glance
Environmental and
Natural Resources
Building (ENR2)
Location: Tucson, Ariz.
Owner: The University of Arizona
Principal Use: Office, classrooms, lecture rooms, auditorium
Employees/Occupants (from Energy Model): Peak occupants:
616; Peak transients: 1,267; FTE occupants: 452
Gross Square Feet: 207,632
Substantial Completion/Occupancy: 2015
Occupancy: Daily avg. transients (students/visitors): 1,047

Henry Johnstone, P.E., is president of GLHN, Tucson, Ariz.



ASHRAE Journal - April 2020

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

Contents
ASHRAE Journal - April 2020 - Intro
ASHRAE Journal - April 2020 - Cover1
ASHRAE Journal - April 2020 - Cover2
ASHRAE Journal - April 2020 - 1
ASHRAE Journal - April 2020 - Contents
ASHRAE Journal - April 2020 - 3
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ASHRAE Journal - April 2020 - Cover3
ASHRAE Journal - April 2020 - Cover4
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