Use of computational fluid dynamics (CFD) modelling to improve tracer gas techniques in very open naturally ventilated livestock buildings

H.J.C. van Dooren, A. Sapounas

Research output: Book/ReportReportProfessional

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.
Original languageDutch
Place of PublicationLelystad
PublisherWageningen UR Livestock Research
Number of pages34
Publication statusPublished - 2013

Publication series

NameReport / Wageningen UR Livestock Research
PublisherWageningen UR Livestock Research
No.664
ISSN (Print)1570-8616

Keywords

  • dairy farming
  • cattle housing
  • cow housing
  • natural ventilation
  • ventilation
  • computational fluid dynamics
  • modeling

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