Click on “Download PDF” for the PDF version or on the title for the HTML version.
If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.
Quantification of Air Exchange Rates and Gaseous Emissions throughout Naturally Ventilated Dairy Barns
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: 2012 Dallas, Texas, July 29 - August 1, 2012 121340566.(doi:10.13031/2013.42197)
Authors: Alaa Kiwan Kiwan, Werner Berg, Hans-Joachim Müller, Manfred Gläser, Merike Fiedler, Christian Ammon, Reiner Brunsch
Keywords: Keywords: Radioactive isotope Krypton-85, tracer gas technique, naturally-ventilation, air velocity measurement, air exchange rate, CO2 mass balance model
Animal husbandry is a major source of atmospheric emissions, e.g., ammonia, and methane. The quantification of emission flow has gained special attention in the recent years. But, in naturally-ventilated barns this quantification is still a difficult task. A main issue is to estimate the air exchange rate (AER) of the barn, and then to quantify the emission flow. This study consisted of several trials conducted during mild and cold periods of the year in two naturally-ventilated dairy cattle barns located in northeast Germany. During the experiments, the concentrations of (NH3, CH4 and CO2) as well as the temperature were measured outside and inside the barns. The wind speed and the wind direction outside the barns were recorded as well as the air speed through the openings of the barns. The AERs were estimated according to three methods: concentration decay of radioactive isotope tracer-gas Krypton85 (85Kr-M), the air speed through the inlet openings (AS-M), and the CO2 mass balance model (CO2-M). The comparison was done by performing the Pearson correlation analysis and by developing a linear regression model.(Download PDF) (Export to EndNotes)