Publikationsdatenbank

Direct measurements of the volume flow rate and emissions in a large naturally ventilated building (2020)

Art

Zeitschriftenartikel / wissenschaftlicher Beitrag

Autoren

Janke, David

Yi, Qianying

Thormann, Lars

Hempel, Sabrina

Amon, Barbara

Nosek, Štepán

van Overbeke, Philippe

Amon, Thomas (WE 10)

Quelle

Sensors

Bandzählung: 20

Heftzählung: 21

Seiten: Artikel 6223

ISSN: 1424-8220

Sprache

Englisch

Verweise

URL (Volltext): https://www.mdpi.com/1424-8220/20/21/6223

DOI: 10.3390/s20216223

Pubmed: 33142838

Kontakt

Institut für Tier- und Umwelthygiene

Robert-von-Ostertag-Str. 7-13
14169 Berlin
+49 30 838 51845
tierhygiene@vetmed.fu-berlin.de

Abstract / Zusammenfassung

The direct measurement of emissions from naturally ventilated dairy barns is challenging due to their large openings and the turbulent and unsteady airflow at the inlets and outlets. The aim of this study was to quantify the impacts of the number and positions of sensors on the estimation of volume flow rate and emissions. High resolution measurements of a naturally ventilated scaled building model in an atmospheric boundary layer wind tunnel were done. Tracer gas was released inside the model and measured at the outlet area, using a fast flame ionization detector (FFID). Additionally, the normal velocity on the area was measured using laser Doppler anemometry (LDA). In total, for a matrix of 65 × 4 sensor positions, the mean normal velocities and the mean concentrations were measured and used to calculate the volume flow rate and the emissions. This dataset was used as a reference to assess the accuracy while systematically reducing the number of sensors and varying the positions of them. The results showed systematic errors in the emission estimation up to +97%, when measurements of concentration and velocity were done at one constant height. This error could be lowered under 5%, when the concentrations were measured as a vertical composite sample.