ASHRAE Journal - September 2022 - 58
Seventy-fi ve percent of the original interior
structure of Iowa State University's
Marston Hall was removed during a
renovation that preserved the building's
history while updating spaces and
infrastructure.
© 2016 IMEG CORP.
Fitting Old with New
BY LINCOLN D. PEARCE, P.E., BEAP, MEMBER ASHRAE
Marston Hall is the 60,000 ft2 (5574 m2) historic home of the College of
Engineering at Iowa State University (ISU) in Ames, Iowa. The original building
fi rst opened in 1903. In 2016 ISU completed the fi rst comprehensive
renovation, creating a 21st century learning environment within the 19th
century structure to give the building another 100 years of life. The building
is currently using 50% less energy than it had prior to the renovations, even
though its use and occupancy have increased signifi cantly.
Energy Effi ciency
The building is served by campus steam and
chilled water from Iowa State's central power and
cogeneration plant. As such, opportunities were
not available to improve upon the production of
heating and cooling effi ciency within the building.
Nor were opportunities available for on-site renewable
energy. However, the following strategies were
used within the building to optimize its energy effi -
cient operation:
1. Envelope loads were minimized by adding
insulation to exterior walls. The original masonry
building structure did not include exterior wall
insulation; the original exterior wall R-value was
calculated as 2.7. Newly added insulation increased
the exterior wall R-value to 15. The building's operable
windows had been replaced just before the
renovation and are modern double-pane insulated
units.
2. The ventilation load was minimized by using
a dedicated outdoor air system (DOAS). Ventilation
is one of the largest loads that must be accommodated
in facilities in Climate Zone 5A due
to extreme winter and summer conditions, so
the use of a DOAS ventilation system allowed the
amount of ventilation air provided to the buildLincoln
D. Pearce, P.E., BEAP, is a senior principal at IMEG Corp. in Des Moines, Iowa.
58
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ASHRAE Journal - September 2022
Table of Contents for the Digital Edition of ASHRAE Journal - September 2022
Contents
ASHRAE Journal - September 2022 - Intro
ASHRAE Journal - September 2022 - Cover1
ASHRAE Journal - September 2022 - Cover2
ASHRAE Journal - September 2022 - 1
ASHRAE Journal - September 2022 - Contents
ASHRAE Journal - September 2022 - 3
ASHRAE Journal - September 2022 - 4
ASHRAE Journal - September 2022 - 5
ASHRAE Journal - September 2022 - 6
ASHRAE Journal - September 2022 - 7
ASHRAE Journal - September 2022 - 8
ASHRAE Journal - September 2022 - 9
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ASHRAE Journal - September 2022 - 11
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ASHRAE Journal - September 2022 - Cover3
ASHRAE Journal - September 2022 - Cover4
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