ASHRAE Journal - September 2021 - 46
IEQ APPLICATIONS
Column
Wei Sun
Inspirations From Cleanroom HVAC Technologies
Reducing Airborne
Contamination,
Transmission & Migration
BY WEI SUN, P.E., FELLOW ASHRAE
HVAC technologies used in cleanrooms can achieve ultralow airborne contamination,
transmission and migration to meet industrial specifi cations. Traditionally,
people assume cleanrooms consume high levels of energy, and their technologies and
associated costs are only justifi ed for high-tech sectors. However, emerging design
concepts and approaches are becoming more cost-effective and energy effi cient while
achieving excellent airborne cleanliness performance. Many mitigation strategies
have been studied to tackle COVID-19 challenges in airborne contamination control.
Cleanrooms' unique and mature air handling, distribution, cascading, segregation
and fi ltration techniques may encourage experimenting with some of its concepts for
commercial spaces to achieve better airborne infectious disease transmission control
where applicable and cost-effective.
Cleanroom and HVAC Design Complexity
A cleanroom is an enclosed space in which airborne
particles (both nonviable and viable) are controlled and
classifi ed. A cleanroom is designed, constructed and
operated to minimize particle generation and retention
inside the room, as well as migration from adjacent
spaces to accomplish ultrahigh-purity airborne and
surface-borne cleanliness.
In addition to controlling cleanroom temperature,
humidity and ventilation rate,its airfl ow pattern, pressure,
fi ltration, particle and gaseous concentrations,
46
ASHRAE JOURNAL ashrae.o rg S E P T E M B E R 2 0 2 1
etc., also need to be well controlled and quantitatively
tested to meet stringent ISO 14644 standards and process
specifi cations. If a cleanroom's supply airfl ow rate
varies, the room's airfl ow pattern, pressure differential,
contaminant removal and particle/microbial/gaseous
concentrations are going to be altered or distorted
Wei Sun, P.E., is president of Engsysco with offi ces in Ann Arbor and Farmington Hills,
Mich. He is an ASHRAE Distinguished Lecturer, member of Technology Council, past
Chair of Environmental Health Committee and TC 9.11, Clean Spaces. He was past IEST
Society President and serves as NEBB's CPT Standard Chair and ISO TC209 Standards
U.S. Delegate.
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://ashrae.org
ASHRAE Journal - September 2021
Table of Contents for the Digital Edition of ASHRAE Journal - September 2021
Contents
ASHRAE Journal - September 2021 - Intro
ASHRAE Journal - September 2021 - Cover1
ASHRAE Journal - September 2021 - Cover2
ASHRAE Journal - September 2021 - 1
ASHRAE Journal - September 2021 - Contents
ASHRAE Journal - September 2021 - 3
ASHRAE Journal - September 2021 - 4
ASHRAE Journal - September 2021 - 5
ASHRAE Journal - September 2021 - 6
ASHRAE Journal - September 2021 - 7
ASHRAE Journal - September 2021 - 8
ASHRAE Journal - September 2021 - 9
ASHRAE Journal - September 2021 - 10
ASHRAE Journal - September 2021 - 11
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ASHRAE Journal - September 2021 - Cover3
ASHRAE Journal - September 2021 - Cover4
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