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 443632
Title Use of computational fluid dynamics (CFD) modelling to improve tracer gas techniques in very open naturally ventilated livestock buildings
Author(s) Dooren, H.J.C. van; Sapounas, A.
Source Lelystad : Wageningen UR Livestock Research (Report / Wageningen UR Livestock Research 664) - 34
Department(s) LR - Environment
GTB Tuinbouw Technologie
Publication type Research report
Publication year 2013
Keyword(s) melkveehouderij - huisvesting van rundvee - huisvesting van koeien - natuurlijke ventilatie - ventilatie - computationele vloeistofdynamica - modelleren - dairy farming - cattle housing - cow housing - natural ventilation - ventilation - computational fluid dynamics - modeling
Categories Cattle / Animal Housing, Management and Care
Abstract Ventilation rates from naturally ventilated livestock buildings are commonly measured using CO2 produced by animals or SF6 injected in the building acting as a tracer gas. Crucial assumption for this method is that the tracer gas is completely mixed through the whole building and behaves comparable with the target gasses like ammonia (NH3). In very open livestock buildings like modern dairy barns this assumption is under pressure due to the relatively increasing share of cross ventilation to the total ventilation rate. Analyses of emission measurements using CO2 as a tracer gas have shown that with the used sampling pattern the variation between farms is reduced to an acceptable level. The analyses also showed that more emphasis should be paid to the accuracy and precision of the measurements. The use of models can help to gain insight in ventilation rates, flow patterns and internal concentration differences at different outdoor conditions.
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