ASHRAE Journal - August 2021 - 26

IEQ APPLICATIONS
Column
Lawrence J. Schoen
Case Study
Evaluating Ultraviolet
Germicidal Irradiation
BY LAWRENCE J. SCHOEN, P.E., FELLOW/LIFE MEMBER ASHRAE
Ultraviolet germicidal irradiation (UVGI) of air is a proven technique for controlling
infectious aerosols.1 This column summarizes an evaluation of in-duct UVGI
proposals for several buildings under the control of one owner and operator with
the purpose of reducing COVID-19 transmission. The column also briefl y discusses
upper-room UVGI.
My company reviewed and evaluated proposals and
dose calculations from two qualifi ed vendors and clarifi
ed their scope in discussions and emails. Based on
our evaluation of sample calculations, the proposals
were estimated to provide enough ultraviolet (UV) lamp
intensity to achieve 90% kill rate for SARS-CoV-2. We
recommended the following if the owner decides to
implement in-duct UV:
* The contract should be contingent on review and
approval by a qualifi ed third party of preconstruction
submissions including detailed UV dose calculations
based on air handler geometry, UV lamp location, air
velocity and other specifi c data for each AHU.
* The additional maintenance (lamp replacement,
etc.) and energy cost should be accounted for in owner
budgeting.
However, our evaluation concluded that UVGI is several
times more expensive to install and operate than
previously estimated in the 2019ASHRAE Handbook-
HVAC Applications. Therefore, we recommended that the
26
ASHRAE JOURNAL ashrae.org A U G U S T 2 0 2 1
owner fi rst exhaust more basic options that include fi ltration,
dilution with outside air, verifi cation of airfl ows
and recommissioning. This case study may be useful in
guiding others in evaluating other real-world proposals
for using UVGI to control infectious disease aerosols.
Price Summary and Comparison
Table 1 summarizes the prices from two vendors. Both
vendors relied on suppliers for the UV products and for
calculations of the dose and lamp intensity required.
Installation Features
Following are some features provided in either or both
of the proposals that are necessary for a complete installation
or are enhancements that are worth considering,
in addition to price:
* Electric power to lamps;
Lawrence J. Schoen, P.E., is president of Schoen Engineering, Inc., in Columbia, Md.
He is a member of ASHRAE's Standards Committee, is co-vice chair of ASHRAE SSPC
189.1 and is a member of ASHRAE SSPC 55.
This peer-reviewed column does not represent offi cial ASHRAE guidance. For more information on ASHRAE resources on COVID-19, visit ashrae.org/COVID19.
http://www.ashrae.org/COVID19 http://www.ashrae.org

ASHRAE Journal - August 2021

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

Contents
ASHRAE Journal - August 2021 - Intro
ASHRAE Journal - August 2021 - Cover1
ASHRAE Journal - August 2021 - Cover2
ASHRAE Journal - August 2021 - 1
ASHRAE Journal - August 2021 - Contents
ASHRAE Journal - August 2021 - 3
ASHRAE Journal - August 2021 - 4
ASHRAE Journal - August 2021 - 5
ASHRAE Journal - August 2021 - 6
ASHRAE Journal - August 2021 - 7
ASHRAE Journal - August 2021 - 8
ASHRAE Journal - August 2021 - 9
ASHRAE Journal - August 2021 - 10
ASHRAE Journal - August 2021 - 11
ASHRAE Journal - August 2021 - 12
ASHRAE Journal - August 2021 - 13
ASHRAE Journal - August 2021 - 14
ASHRAE Journal - August 2021 - 15
ASHRAE Journal - August 2021 - 16
ASHRAE Journal - August 2021 - 17
ASHRAE Journal - August 2021 - 18
ASHRAE Journal - August 2021 - 19
ASHRAE Journal - August 2021 - 20
ASHRAE Journal - August 2021 - 21
ASHRAE Journal - August 2021 - 22
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ASHRAE Journal - August 2021 - 24
ASHRAE Journal - August 2021 - 25
ASHRAE Journal - August 2021 - 26
ASHRAE Journal - August 2021 - 27
ASHRAE Journal - August 2021 - 28
ASHRAE Journal - August 2021 - 29
ASHRAE Journal - August 2021 - 30
ASHRAE Journal - August 2021 - 31
ASHRAE Journal - August 2021 - 32
ASHRAE Journal - August 2021 - 33
ASHRAE Journal - August 2021 - 34
ASHRAE Journal - August 2021 - 35
ASHRAE Journal - August 2021 - 36
ASHRAE Journal - August 2021 - 37
ASHRAE Journal - August 2021 - 38
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ASHRAE Journal - August 2021 - Cover3
ASHRAE Journal - August 2021 - Cover4
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