Publikationsdatenbank

Calculation of ventilation rates and ammonia emissions:
comparison of sampling strategies for a naturally ventilated dairy barn (2020)

Art

Zeitschriftenartikel / wissenschaftlicher Beitrag

Autoren

Janke, David

Willink, Dylia

Ammon, Christian

Hempel, Sabrina

Schrade, Sabine

Demeyer, Peter

Hartung, Eberhard

Amon, Barbara

Ogink, Nico

Amon, Thomas (WE 10)

Quelle

Biosystems engineering

Bandzählung: 198

Seiten: 15 – 30

ISSN: 1537-5110

Sprache

Englisch

Verweise

URL (Volltext): https://www.sciencedirect.com/science/article/pii/S153751102030204X

DOI: 10.1016/j.biosystemseng.2020.07.011

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

Emissions and ventilation rates (VRs) in naturally ventilated dairy barns (NVDBs) are usually measured using indirect methods, where the choice of inside and outside sampling locations (i.e. sampling strategy) is crucial. The goal of this study was to quantify the influence of the sampling strategy on the estimation of emissions and VRs. We equipped a NVDB in northern Germany with an extensive measuring setup capable of measuring emissions under all wind conditions. Ammonia (NH3) and carbon dioxide (CO2) concentrations were measured with two Fourier-transform infrared spectrometers. Hourly values for ventilation rates and emissions for ammonia over a period of nearly a year were derived using the CO2 balance method and five different sampling strategies for the acquisition of indoor and outdoor concentrations were applied. When comparing the strategy estimating the highest emission level to the strategy estimating the lowest, the differences in NH3 emissions in winter, transition, and summer season were +26%, +19% and +11%, respectively. For the ventilation rates, the differences were +80%, +94%, and 63% for the winter, transition and summer season, respectively. By accommodating inside/outside concentration measurements around the entire perimeter of the barn instead of a reduced part of the perimeter (aligned to a presumed main wind direction), the amount of available data substantially increased for around 210% for the same monitoring period.