ASHRAE Journal - April 2013 - 41

2013 ASHRAE Technology Award Case Studies
The SSC is a new three story 34,500
ft2 (3206 m2) building that was completed and occupied in August 2011. The
project is seeking LEED-NC 2.2 Gold
and has participated in the California
statewide Savings by Design program.

Energy Efficiency Measures
The project used a design-build delivery method with the contract awarded
through a design competition. This allowed the team to have a holistic approach, with all disciplines collaborating to deliver a cost-effective sustainable
design. The energy efficiency measures
used in the project included:
• Hybrid chilled beam variable air
volume (VAV) system. One 100% outdoor air (OA) AHU was used to serve
the internal spaces through a conventional VAV system and provide primary
air to the chilled beams for the perimeter spaces. The all-water chilled beam
system allowed the total building cfm
to be in the range of 0.5 cfm/ft2 (0.24
L/[s·m2]), which resulted in substantial
fan energy savings. The added pumping
energy was still low enough that it didn’t
offset the fan energy savings.
• Heat recovery and indirect evaporative cooling systems on the main
air-handling unit. An evaporative cooling system was added on the exhaust
airstream, allowing the return air to be
cooled to slightly above its wet-bulb
temperature (66°F [19°C]) before being
passed on to the energy recovery airto-air heat exchanger. The combination
of the evaporative cooling and the heat
recovery allows outside air in summer
to be cooled from 106°F to about 81°F
(41°C to about 27°C). In the winter, the
heat recovery system allows air to be
heated from 24°F to about 51°F (–4°C
to about 11°C).
• Demand control ventilation strategy implemented by installing a VAV
box upstream of the chilled beams.
Most high-occupancy spaces served by
the chilled beams have their primary
air requirements governed by ventilation requirements rather than by cooling demand. Carbon dioxide sensors
were added to these spaces that added
a demand control ventilation loop to the
April 2013

VAV control and allowed reduction of
primary airflow to unoccupied spaces.
• Daylighting and occupancy sensor
controls. Daylighting modeling was
performed for strategic locations, and
solar tubes were provided as deemed
necessary to minimize lighting energy
use. The tubes have additional control
dampers that can be manually adjusted
by occupants to control brightness. The
current installed lighting design with
control credit has an installed lighting power density (LPD) of 0.676 W/
ft² (7.28 W/m2). Without taking into
account lighting control credits, the installed LPD is 0.74 W/ft² (7.97 W/m2),
which is approximately 25% less than
the allowed LPD as defined by the California Energy Code.
• High performance glazing systems
with integrated shading systems (on the
west façade) have excellent daylighting
potential without heat load penalty. The
structure’s windows are low-e doublepaned windows. The façade has an approximate 31% window-to-wall ratio.
• Optimized high performing building
opaque envelope. The typical opaque
wall construction is metal framed with
R-15 batt insulation between the studs,
with an additional R-5 rigid insulation board on the exterior of the framing system to reduce bridging through
the metal studs. The resulting U-factor
of this wall system is 0.103. The metal
spandrel wall has an overall U-factor of
0.111. The roof is a metal deck roof with
continuous R-30 insulation above it. The
aged reflectance of the roof is 0.53 and
the thermal emittance is 0.87.
• On-demand pumping control sequence allowing the building to shut
down its chilled water pumps and use
the available pressure from the campus
chilled water network when possible.
This was accomplished by incorporating
a three-stage pumping control sequence.
In Stage 1, both chilled water pumps are
turned off, and the building chilled water
demand is fed directly from the campus
site loop. Once any of the AHUs’ valves
reach 95% of the open position, Stage 2
is enabled turning on one chilled water
pump. Once this pump reaches 99% of its
full speed, Stage 3 is enabled turning on

the second chilled water pumps. This sequence has allowed pumping energy savings, especially in the shoulder seasons.
As modeled, the project was able to
achieve 38% energy savings with respect to a Standard 90.1-2004 baseline
on an energy cost basis for both electricity and steam. The metered electricity
and steam use for 2012 are shown in
Figures 1 and 2 along with the modeled
values and the baseline values. So far,
the building is exceeding the expectations for both electricity and steam use,
except for the first few months in the
year for steam.
On an energy time-dependent valuation (TDV) basis, the project achieved
34.3% energy savings based on California Title 24-2005. The project participated in the California statewide
Savings by Design program, which contributed $126,000 of owner incentives
and $28,000 of design team incentives.

Indoor Air Quality
Because the chilled beam system
operates close to the outdoor air requirements for occupancy, it allows

Building at a Glance
Segundo Service Center
Location: Davis, Calif.
Owner: University of California, Davis
Principal Use: Student services
Includes: Academic advising center,
computer center, recreation room, laundry room, service desk, mail center
and convenience store
Employees/Occupants: About 80
employees
Gross Square Footage: 34,500
Conditioned Space: 33,500 ft2
Substantial Completion/Occupancy:
September 2011
Occupancy: 90%

ASHRAE Journal

41



ASHRAE Journal - April 2013

Table of Contents for the Digital Edition of ASHRAE Journal - April 2013

ASHRAE Journal - April 2013
Contents
Commentary
Industry News
Letters
Meetings and Shows
Feature Articles
Ground-Coupled Heat Pump and Energy Storage
Fan Efficiency Requirements for Standard 90.1-2013
Technology Award Case Studies:
Geothermal for 5 Ecosystems
Holistic HVAC Design
Standing Columns
Engineer’s Notebook
Data Centers
Emerging Technologies
IAQ Applications
Refrigeration Applications
Special Products
People
International Column
Energy Modeling
Products
Classified Advertising
Advertisers Index
ASHRAE Journal - April 2013 - ASHRAE Journal - April 2013
ASHRAE Journal - April 2013 - Cover2
ASHRAE Journal - April 2013 - 1
ASHRAE Journal - April 2013 - 2
ASHRAE Journal - April 2013 - Contents
ASHRAE Journal - April 2013 - Commentary
ASHRAE Journal - April 2013 - 5
ASHRAE Journal - April 2013 - Industry News
ASHRAE Journal - April 2013 - 7
ASHRAE Journal - April 2013 - 8
ASHRAE Journal - April 2013 - Letters
ASHRAE Journal - April 2013 - Meetings and Shows
ASHRAE Journal - April 2013 - 11
ASHRAE Journal - April 2013 - 12
ASHRAE Journal - April 2013 - 13
ASHRAE Journal - April 2013 - Ground-Coupled Heat Pump and Energy Storage
ASHRAE Journal - April 2013 - 15
ASHRAE Journal - April 2013 - 16
ASHRAE Journal - April 2013 - I1
ASHRAE Journal - April 2013 - I2
ASHRAE Journal - April 2013 - I3
ASHRAE Journal - April 2013 - I4
ASHRAE Journal - April 2013 - 17
ASHRAE Journal - April 2013 - 18
ASHRAE Journal - April 2013 - 19
ASHRAE Journal - April 2013 - 20
ASHRAE Journal - April 2013 - 21
ASHRAE Journal - April 2013 - 22
ASHRAE Journal - April 2013 - 23
ASHRAE Journal - April 2013 - Fan Efficiency Requirements for Standard 90.1-2013
ASHRAE Journal - April 2013 - 25
ASHRAE Journal - April 2013 - 26
ASHRAE Journal - April 2013 - 27
ASHRAE Journal - April 2013 - 28
ASHRAE Journal - April 2013 - 29
ASHRAE Journal - April 2013 - 30
ASHRAE Journal - April 2013 - 31
ASHRAE Journal - April 2013 - Geothermal for 5 Ecosystems
ASHRAE Journal - April 2013 - 33
ASHRAE Journal - April 2013 - 34
ASHRAE Journal - April 2013 - 35
ASHRAE Journal - April 2013 - 36
ASHRAE Journal - April 2013 - 37
ASHRAE Journal - April 2013 - 38
ASHRAE Journal - April 2013 - 39
ASHRAE Journal - April 2013 - Holistic HVAC Design
ASHRAE Journal - April 2013 - 41
ASHRAE Journal - April 2013 - 42
ASHRAE Journal - April 2013 - 43
ASHRAE Journal - April 2013 - 44
ASHRAE Journal - April 2013 - 45
ASHRAE Journal - April 2013 - 46
ASHRAE Journal - April 2013 - 47
ASHRAE Journal - April 2013 - Engineer’s Notebook
ASHRAE Journal - April 2013 - 49
ASHRAE Journal - April 2013 - 50
ASHRAE Journal - April 2013 - 51
ASHRAE Journal - April 2013 - 52
ASHRAE Journal - April 2013 - 53
ASHRAE Journal - April 2013 - Data Centers
ASHRAE Journal - April 2013 - 55
ASHRAE Journal - April 2013 - 56
ASHRAE Journal - April 2013 - 57
ASHRAE Journal - April 2013 - 58
ASHRAE Journal - April 2013 - 59
ASHRAE Journal - April 2013 - Emerging Technologies
ASHRAE Journal - April 2013 - 61
ASHRAE Journal - April 2013 - 62
ASHRAE Journal - April 2013 - 63
ASHRAE Journal - April 2013 - IAQ Applications
ASHRAE Journal - April 2013 - 65
ASHRAE Journal - April 2013 - 66
ASHRAE Journal - April 2013 - Refrigeration Applications
ASHRAE Journal - April 2013 - Special Products
ASHRAE Journal - April 2013 - People
ASHRAE Journal - April 2013 - International Column
ASHRAE Journal - April 2013 - 71
ASHRAE Journal - April 2013 - Energy Modeling
ASHRAE Journal - April 2013 - 73
ASHRAE Journal - April 2013 - Products
ASHRAE Journal - April 2013 - 75
ASHRAE Journal - April 2013 - 76
ASHRAE Journal - April 2013 - 77
ASHRAE Journal - April 2013 - 78
ASHRAE Journal - April 2013 - Classified Advertising
ASHRAE Journal - April 2013 - Advertisers Index
ASHRAE Journal - April 2013 - Cover3
ASHRAE Journal - April 2013 - Cover4
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