A1 Journal article (refereed), original research

Variable-speed-drive-based method for the cost optimization of air filter replacement timing

Open Access hybrid publication

Publication Details
Authors: Pöyhönen Santeri, Ahola Jero, Niemelä Markku, Hammo Simo, Punnonen Pekka
Publisher: Elsevier
Publication year: 2021
Language: English
Related journal or series: Energy and Buildings
Volume number: 240
ISSN: 0378-7788
eISSN: 1872-6178
JUFO level of this publication: 2
Open Access: Open Access hybrid publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe202103319057


The flow resistance of air filters accounts for a significant share of
the electric energy consumed by fan systems. Due to their inevitable
fouling, filters must be replaced periodically. This paper presents a
novel variable-speed-drive-based method for online determination of the
cost-optimal time to replace the filter of a fan system. The total cost
of filtering per filtered volume of air is continuously calculated and
when its minimum is reached, filter replacement is recommended. As part
of the calculation, the energy cost related to the pressure drop of the
filter is estimated using a variable-speed-drive-based filter pressure
drop soft sensor. In addition to a variable-speed-drive and
manufacturers’ specifications for the fan and filter, no extra equipment
is required. As such, the method can be implemented as a programmed
feature in a variable-speed drive or in a remote control and monitoring
system. Feasibility of the method is verified with simulations and
laboratory measurements, and the results suggest that it can realize a
lower life-cycle cost of air filtering than the so far prevalent
practices of filter replacement timing.

Last updated on 2021-08-04 at 07:38

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