ASHRAE Journal - April 2020 - 50

2020

ASHRAE TECHNOLOGY AWARD CASE STUDIES

FIGURE 2 Diagrammatic sectional perspective with EUI.

winter and reheat during summer dehumidification. Overall, however, energy efficiency of the
building is tracking expectations, and remains substantially below other campus buildings with similar
occupancy.

Indoor Air Quality and Thermal Comfort
Indoor air quality (IAQ) was of great concern to
building users in early design, as well as a factor in
decisions to allocate large areas of the canyon floor
and balconies to passively tempered circulation,
collaboration, and study. During the academic year,
these spaces are highly utilized by students and staff.
Indoor spaces on the upper levels are ventilated
through the dedicated outdoor air units, which
include airflow stations and modulating dampers.
These floors are generally overventilated to maintain a consistent positive pressurization during
occupancy.
Space and return air monitoring is used in the
pods and large lecture halls on the first floor to
modulate outside air in proportion to actual CO2
levels. Daily trends of outside air damper position,
taken over multiple class periods, demonstrate the
50

ASHRAE JOURNAL

ashrae.org

APRI L 2020

TABLE 1 Regional temperature range.

ASHRAE Tucson Design Conditions
Winter

32°F DB

Summer 104°F DB / 73°F WB

value of this approach in matching HVAC energy
load to occupancy. Ventilation effectiveness varies
by the various system types. The underfloor systems
used in conference rooms and open offices operate with a 1.2 multiplier in cooling mode, which is
predominant. Chilled-beam spaces are generally
designed to provide a primary plus induced 50 fpm
at the occupant level, using only ventilation air as
the primary driver.
Thermal comfort has been satisfactory through
the first three years. Although chilled-beam offices
are ganged together for cooling and heating control, the overall number of thermostats/occupant
(12-15 people/stat) is higher than most comparable
buildings. Discharge air temperature in the open
office underfloor air distribution (UFAD) spaces
was adjusted upward, from 65 to 68 in the first
cooling season in response to occupant perception.
The population of the Environmental and Natural
Resources Building 2 is amenable to adapting


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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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