ASHRAE Journal - October 2020 - 47

2020 ASHRAE TECHNOLOGY AWARD CASE STUDIES

considered a variety of energy conPHOTO 3 Cardiac operating room. 1) Ceiling laminar flow diffuser grid above clean zone; 2) low return; 3) speservation measures (ECMs) for the
cialty open heart operating rooms are designed to fluctuate from 80°F (max) to 55°F (min).
HVAC system at the beginning of
schematic design. Energy cost mod1
els were run for each system type,
which included optimized envelope,
variable air volume HVAC systems,
100% outdoor air systems with heat
recovery, oversized air-handling
units, displacement ventilation versus standard overhead distribution,
2
plus various combinations of these
options. This data was tabulated and
3
compared with a baseline model
based on ASHRAE/IESNA Standard
90.1-2007. We found the most effective results were a combination of
Clean Zone
multiple ECMs, including optimized
exterior, DV with some 100% outdoor
air and heat recovery, VAV, and oversized AHUs. This net result showed a
manufactured within 500 miles (805 km) of Palo Alto.
simple payback of about four years and an internal rate
Reclaimed wood either from the site or nearby demoliof return of 23.8%.
tion projects at Moffett Field was incorporated throughout the project.
Environmental Impact
Carbon (GHG Emissions) Reduction. The LEEDIrrigation. Drought-tolerant and water-efﬁcient land- baseline energy model was used for energy results, and
scaping is irrigated with nonpotable water only, which is the Packard Children's LEED Proposed model (adjusted
collected in two 55,000 gallon (208 198 L) underground
to match metered data) for the actual Packard Children's
cisterns. The cistern system ﬁlters, stores and reuses
energy use. Energy Star Portfolio Manager was used to
water collected from rainfall, mechanical equipment
calculate the GHG emission. Packard Children's has a
condensate and even reverse osmosis deionized water
40% reduction in CO2 emissions compared to an equivalent ASHRAE Standard 90.1-2007 compliant facility.
regeneration rejection water.
Green Spaces. The building incorporates natural eleAccording to research provided by the project's head
ments seamlessly-3.5 acres (1.4 ha) of gardens and green
planning architect, Packard Children's is the ﬁrst
space for patients, families, visitors and staff to enjoy.
hospital in California to use this cistern technology,
which is expected to save as much as 800,000 gallons
Acknowledgment
(3 million L) of irrigation water per year.
The authors would like to acknowledge and thank
Low-Flow Fixtures. 3.38 million gallons
Austin Barolin and James Ramage for their contribu(12.8 million L) worth of water is saved annually from
tions on energy veriﬁcation and energy modeling;
the use of low-ﬂow ﬁxtures (as submitted for LEED
Amber McClintock, Ashley Winn and Jessica Hamann
credit WEp1) and 359.45 kgal (1.4 million L) per year for
sterilization equipment that has heat exchangers reject- for their contributions to preparing this article; and
the entire Stanford Children's team for
ing heat to chilled water.
their dedication and support for bringReclaimed Materials. More than 28% of Packard
ing this project to fruition and fulﬁlling
Children's building materials contain recycled conthe goals established for technological https://bit.ly/3bajige
tent (including carpet, tile, steel and concrete), and
Rate this Column
innovation.
more than 26% of those materials were extracted or
O CTO B E R 2020

ashrae.org

ASHRAE JOURNAL

https://www.bit.ly/3bajige https://www.ashrae.org/

ASHRAE Journal - October 2020

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