ASHRAE Journal - April 2021 - 62

2021 ASHRAE Technology Awards | First Place

Healthcare organization undertakes HVAC
and advanced BAS retroﬁt to achieve
deep energy savings and improved thermal comfort.

Medical Ofﬁce Building
Thrives With Advanced
Control Sequences
BY REECE KIRIU, P.E. MEMBER ASHRAE; JEFF STEIN, P.E. MEMBER ASHRAE

Implementing best-in-class control sequences during the HVAC retroﬁt of a
two-story, 215,000 ft2 (19 974 m2) medical ofﬁce building in Vallejo, Calif., helped
reduce energy bills by over $200,000 per year and to reduce heating energy
use by more than 55%. This project is a key demonstration of a cost-effective
approach to signiﬁcantly reduce building energy use in new and existing buildings while realizing massive decarbonization in the existing building stock.
The building, which is part of a hospital campus,
was constructed in 1993 and includes physician
ofﬁces and other clinical spaces for departments such
as pharmacy, cardiology, orthopedics and pediatrics.
Twelve variable air volume (VAV) air-handling
unit (AHUs) and one constant air volume AHU

serve the building. The AHUs serve three types of
VAV terminal units at the zone level: reheat boxes,
cooling-only boxes and fan-powered boxes. The
VAV AHUs serve the medical ofﬁce spaces and are
scheduled per program requirements, while the
constant air volume AHU serves the general surgery

Reece Kiriu, P.E., is a senior mechanical engineer, and Jeff Stein, P.E., is a principal at Taylor Engineering in Alameda, Calif. Kiriu is a member of ASHRAE SGPC 36
and TC 1.4 and was a member of the RP-1711 research team. Stein is a member of SPC 195 and a former member of SSPC 90.1 and TC 1.4.
62

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ASHRAE Journal - April 2021

Table of Contents for the Digital Edition of ASHRAE Journal - April 2021

Contents
ASHRAE Journal - April 2021 - Intro
ASHRAE Journal - April 2021 - Cover1
ASHRAE Journal - April 2021 - Cover2
ASHRAE Journal - April 2021 - 1
ASHRAE Journal - April 2021 - Contents
ASHRAE Journal - April 2021 - 3
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ASHRAE Journal - April 2021 - Cover3
ASHRAE Journal - April 2021 - Cover4
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