Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 501854
Title Spatial variability of mixing ratios of ammonia and tracer gases in a naturally ventilated dairy cow barn
Author(s) Mendes, Luciano B.; Edouard, Nadège; Ogink, Nico W.M.; Dooren, Hendrik Jan C. van; Fátima F. TinÔco, Ilda de; Mosquera Losada, Julio
Source Biosystems Engineering 129 (2015). - ISSN 1537-5110 - p. 360 - 369.
Department(s) LR - Veehouderij en omgeving
Publication type Refereed Article in a scientific journal
Publication year 2015
Keyword(s) Animal occupied zone - Livestock barns - Metabolic and artificial tracers - Sampling strategy - Tracer gas method

The use of the tracer gas ratio method to estimate emissions from naturally ventilated (NV) livestock barns excludes the need of monitoring ventilation rates. However, it requires accurate measurement of tracer release rate (QT) and a representative estimate of the mixing ratio between pollutant (P) and tracer (T) gases([P]/[T]-). While the quality of QT simply depends on using an accurate commercial mass flow controller, determination of a representative mixing ratio [P]/[T]- is not trivial, since the NV livestock barn airspace presents complex movements that might be dependent on spatial vertical and cross horizontal dimensions. The goal was to assess the spatial variability of concentrations of the artificial tracer gas sulphur hexafluoride (SF6), the metabolic carbon dioxide (CO2) and the pollutant ammonia (NH3), along with their mixing ratios ([NH3]/[CO2], [NH3]/[SF6], [CO2]/[SF6]), inside a NV dairy cow barn. The results indicated that the vertical variability of the calculated mixing ratios became more stable with increase in height, reaching approximately constant values above the animal occupied zone. Using both the metabolic CO2 and the artificially injected SF6 as tracer gases led to a homogeneous spread in behaviour of mixing ratios along V and HC directions. Finally, the possibility of finding a zone within the barn airspace where mixing ratios are considered to be representative for the whole barn, and the implications of applying artificial or metabolic tracers are discussed.

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