ASHRAE Journal - May 2020 - 49

SECOND PLACE | 2020 ASHRAE TECHNOLOGY AWARD CASE STUDIES

The new Frederick Douglass High School is a two-story,
287,125 ft2 (26 675 m2) facility serving 1,800 students
and 150 staff in the Fayette County Public School District
in Lexington, Kentucky. The facility added the capacity
required in the rapidly growing school district with the
intent of being the district's ﬁrst net zero energy-ready
high school. It also is home to the Carter G. Woodson
Academy, a 6th-12th grade academy focused on highpotential minority males in the district.
Energy Efﬁciency

The high school was designed
through parametric energy analysis
based on accumulated metered data
and knowledge of ANSI/ASHRAE/
IES Standard 90.1 Energy Standard for
Buildings Except Low-Rise Residential
Buildings, design parameters to
select highly efﬁcient systems and
equipment.
A geothermal ﬁeld under
the parking lot consists of
452, 300 ft (91 m) deep bores on
20 ft (6 m) centers and serves as the
building's heat source/sink for the
heat pump system. The earth either
absorbs heat from or rejects heat to
the system's building loop piping
as required to keep the loop within
design parameters, negating the
need for a boiler or cooling tower.
Most of the system's heat pumps are
two-speed so that the units can cycle
to low speed at part-load condition.
All of the heat pumps have an EER
over 21. The two-way valve on each
heat pump closes when the compressor is off to minimize pumping
energy.
A single centralized geothermal
pump with a 100% backup pump
circulates the geothermal water
through the ﬁeld and building.
Three pressure sensors located in

remote parts of the piping circuit
measure the differential pressure
between the heat pump supply and
the heat pump return to regulate
the variable frequency drive on the
main centralized pump (Figure 1).
High-volume low-velocity fans
were provided to supplement air
circulation in the two-story cafeteria,
gymnasium, and auxiliary gymnasium. These fans draw only 5 A at
120 V, and the increased air velocity
allows for a higher space temperature setpoint during the warm seasons, thus saving compressor cooling
energy. The fans alone have proven
to keep the gymnasium and auxiliary
gymnasium sufﬁciently cool during
after-school and weekend activities,
saving additional energy.
With the use of efﬁcient systems

Benjamin D. Hobbs is a mechanical engineer at CMTA, Inc.,
Lexington, Ky.
M AY 2020

Building at a Glance
Frederick Douglass
High School
Location: Lexington, Ky.
Owner: Fayette County Public Schools
Principal Use: Educational facility
Gross Square Feet: 287,125
Conditioned Square Feet: 287,125
Substantial Completion/Occupancy: July 2017/August 2017
Architect Tate Hill Jacobs/Perkins+Will

ashrae.org

ASHRAE JOURNAL

49

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ASHRAE Journal - May 2020

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

Contents
ASHRAE Journal - May 2020 - Intro
ASHRAE Journal - May 2020 - Cover1
ASHRAE Journal - May 2020 - Cover2
ASHRAE Journal - May 2020 - 1
ASHRAE Journal - May 2020 - Contents
ASHRAE Journal - May 2020 - 3
ASHRAE Journal - May 2020 - 4
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ASHRAE Journal - May 2020 - 49
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ASHRAE Journal - May 2020 - Cover3
ASHRAE Journal - May 2020 - Cover4
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