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Experimental study of the indoor aerosol-dynamics for a low-momentum ventilation system with an air purifier unit

Lange, Pascal and Westhoff, Andreas and Kohl, Andreas and Müller, Axel (2022) Experimental study of the indoor aerosol-dynamics for a low-momentum ventilation system with an air purifier unit. [Other]

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Official URL: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=4028479


We present an experimental study on the aerosol-dynamics within a test setup representing a class or conference room situation. To ensure realistic flow patterns, the blockage and heat release of the persons are simulated using 18 thermal manikins. The aerosol source is realized by a generator, attached to a thermal manikin, providing a realistic exhalation of artificial saliva. Two different ventilation scenarios are studied regarding aerosol concentration distribution and removal-efficiency. Additionally, the influence of a mask attached to the source and the effect of a moving person on the resulting aerosol concentrations are investigated. Time and spatially resolved concentrations are measured using 61 particulate matter sensors, installed on three height levels. The ventilation scenarios comprise window opening and a lowmomentum ventilation concept, where the air is extracted underneath the ceiling and reenters purified (HEPA14) on floor level. Each of the examined counter measures (open-window, low-momentum ventilation and mask) resulted in a significant lower particle concentration compared to the reference scenario. The low-momentum ventilation with an air purifier unit provided the best aerosol removal-efficiency with a decrease in concentration of up to 96%, followed by the window opening with 60%. The buoyancy flow induced by the heat loads and the resulting flow field caused by the lowmomentum ventilation concept lead to well-directed particle transport towards the ceiling. Consequently, a large amount of aerosol was extracted and filtered by the ventilation system resulting in lower particle concentrations. However, local concentrations were strongly depended on the position of the aerosol source.

Item URL in elib:https://elib.dlr.de/185613/
Document Type:Other
Additional Information:This manuscript was submitted to Journal of Aerosol Science and is currently under review. This is a pre-print version at SSRN.
Title:Experimental study of the indoor aerosol-dynamics for a low-momentum ventilation system with an air purifier unit
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Westhoff, AndreasUNSPECIFIEDhttps://orcid.org/0009-0008-7242-2970UNSPECIFIED
Kohl, AndreasUNSPECIFIEDhttps://orcid.org/0000-0001-8351-7256UNSPECIFIED
Date:17 February 2022
Journal or Publication Title:SSRN
Open Access:Yes
Page Range:pp. 1-43
Keywords:aerosol dynamics, indoor airflow, low-momentum ventilation, air purifier, mask, open-window ventilation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Road Transport
DLR - Research area:Transport
DLR - Program:V ST Straßenverkehr
DLR - Research theme (Project):V - NGC Antriebssystem und Energiemanagement (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Lange, Pascal
Deposited On:09 Mar 2022 16:32
Last Modified:09 Mar 2022 16:32

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