ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 3
BY MICHAEL IVANOVICH, AARON GUNZNER,
AND SCOTT ARNOLD, AMCA INTERNATIONAL
N
umerous studies of airfl ow and performance
characteristics of circulating fans have been
undertaken.1,2,3,4,5,6 Relatively few, however, are focused
on aerosol transmission of airborne pathogens in large
industrial spaces, a shortage all the more noticeable
during the coronavirus disease 2019 (COVID-19)
pandemic.
To contribute to and improve the body of COVID19-prompted
guidance for the operation of circulating
fans, Air Movement and Control Association (AMCA)
International commissioned numerical-simulation
studies of airborne-particle and aerosol transmission
with large-diameter (greater than 2.1 m [7 ft]) ceiling
fans (LDCF). The focus of the studies was warehouses
in the United States, in which LDCF commonly are used
for comfort cooling and destratifi cation. The results,
however, also are applicable to many manufacturing/
industrial facilities.
To promote integrity in the design and execution of
the research and ensure the conclusions drawn from
the study are valid, AMCA assembled " industry " and
" science " teams (Table 1). Consisting of representatives
of AMCA member companies and members of the AMCA
www.amca.org
staff, the industry team provided expertise in the application
and performance of products, while the science team,
made up of authorities in infectious diseases, indoor-air
quality, fans, and computer modeling, including two
leading members of the ASHRAE Epidemic Task Force,
advised on the project setup and reviewed the intermediate
and fi nal results. Because COVID-19 infection rates
are poorly understood and varying with mutations, the
study focused on particle concentrations as an indicator
of exposure risk.
Following is a high-level summary of the project's
fi ndings and resultant guidance. For information on the
simulation methodology, setups, assumptions, validations,
and results, see the fi nal report, " AMCA COVID
Guidance for UNDUCTED Fans - Modeling Ceiling Fans, "
prepared by Liangzhu (Leon) Wang, PhD, P.Eng.; Senwen
Yang; Runzhong (Alvin) Wang; Mohammad Mortezazadeh,
PhD; Jiwei Zou; and Chang Shu of Concordia University,
at https://bit.ly/COVID_LDCF.
The Building
Based on the U.S. Department of Energy (DOE) commercial
reference building for warehouses (Figure 1a), the warehouse
in the study measured 100 m (330 ft) long by 46 m
(150 ft) wide by 8.5 m (28 ft) tall with two AMCA-certifi ed
6.1-m- (20 ft) diameter ceiling fans installed 36.6 m (120 ft)
2021 AMCA inmot ion
3
https://www.bit.ly/COVID_LDCF
http://www.amca.org
http://www.amca.org
ASHRAE Journal Supplement - AMCA InMotion - November 2021
Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA InMotion - November 2021
Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - BB1
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - BB2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover1
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 2
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 3
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 4
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 5
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 6
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 7
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 8
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 9
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 10
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 11
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 12
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 13
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 14
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 15
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ASHRAE Journal Supplement - AMCA InMotion - November 2021 - 21
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ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover3
ASHRAE Journal Supplement - AMCA InMotion - November 2021 - Cover4
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