ASHRAE Journal - December 2023 - 38
TECHNICAL FEATURE
Airborne Particulate
Matter Filtration Using
Non-Thermal Plasma
Air Purification
BY TIMOTHY LAU, PH.D.; MARTIN BELUSKO, PH.D.
Particulate matter typically consists of small solid or liquid particles that can remain
suspended in the air for long durations. It is typically less than tens of µm in size
and can be carried over large distances by the airflow, both in natural environments
(e.g., wind) or in mechanically assisted systems. In addition, it is almost impossible
to avoid due to the sheer number of sources, which may include common household
dust, pollen, powders, construction dust, bushfire smoke, etc. A new generation of
air filtration systems to reduce airborne particulate matter is emerging that relies on
air purification, rather than purely on capture and storage. One such option is via the
use of non-thermal plasma air purification devices. In this article, the authors aim to
provide experimental measurements demonstrating the efficacy of a plasma filtration
system (PFS) under various conditions relevant to HVAC systems.
It is now well established that inhalation of small
solid or liquid particles, particularly those around the
0.1 µm to 3 µm range, can have significant adverse
impacts on human health, both short and long term.1
For example, estimates are that more than 4 million
people die prematurely each year alone due to the effect
of atmospheric particles smaller than 2.5 µm (PM2.5).2
Additionally, the transport of airborne droplets is
also a likely mode of airborne pathogen transmission.
In particular, respiratory pathogens such as the
coronaviruses responsible for the SARS, MERS and
recent COVID-19 outbreaks are likely to spread via
transmission of liquid particles.3
Therefore, an urgent and important need exists for
effective methods to remove and filter particles from
airstreams, particularly within confined environments
Timothy Lau, Ph.D, is lecturer in Sustainable Energy Engineering at The University of South Australia, Australia. Martin Belusko, Ph.D., is an executive consultant at Mondial Advisory,
Parkside, South Australia, Australia.
38
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ASHRAE Journal - December 2023
Table of Contents for the Digital Edition of ASHRAE Journal - December 2023
Contents
ASHRAE Journal - December 2023 - Intro
ASHRAE Journal - December 2023 - BB1
ASHRAE Journal - December 2023 - BB2
ASHRAE Journal - December 2023 - Cover1
ASHRAE Journal - December 2023 - Cover2
ASHRAE Journal - December 2023 - 1
ASHRAE Journal - December 2023 - Contents
ASHRAE Journal - December 2023 - 3
ASHRAE Journal - December 2023 - 4
ASHRAE Journal - December 2023 - 5
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ASHRAE Journal - December 2023 - Cover3
ASHRAE Journal - December 2023 - Cover4
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