Simulating the effect of forced pit ventilation on ammonia emission from a naturally ventilated cow house with CFD

A.A. Sapounas; J.B. Campen; M.C.J. Smits; H.J.C. Dooren

Simulating the effect of forced pit ventilation on ammonia emission from a naturally ventilated cow house with CFD

于Precision livestock farming '09

著者：

A.A. Sapounas

A.A. Sapounas ¹Wageningen UR, Plant Science Group, P.O. Box 644, 6700 AP Wageningen, the Netherlands; athanasios.sapounas@wur.nl

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J.B. Campen

J.B. Campen ¹Wageningen UR, Plant Science Group, P.O. Box 644, 6700 AP Wageningen, the Netherlands; athanasios.sapounas@wur.nl

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M.C.J. Smits

M.C.J. Smits ²Wageningen UR, Animal Science Group, P.O. Box 65, 8200 AB, Lelystad, the Netherlands

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, and

H.J.C. Dooren

H.J.C. Dooren ²Wageningen UR, Animal Science Group, P.O. Box 65, 8200 AB, Lelystad, the Netherlands

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类型:: 章节

Page Range:: 81–89

DOI:: https://doi.org/10.3920/9789086866632_011

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Atmospheric NH₃, mainly originates from agricultural sources, can cause serious environmental problems related to soil acidification and eutrophication. Emissions from dairy houses are 15% of total agricultural NH₃ emission. Due to open buildings, existing abatement options are limited. Pit air separation was identified as a potentially efficacious option. In this study a simulation model of a commercial dairy cow building with slatted floor is presented. The model was solved for 12 cases, differing wind speed, direction and both air and manure temperature. For each case three solutions were obtained which correspond to a naturally ventilated building with (capacity of 250 and 500 /m³/h/cow) and without forced pit ventilation system. The results show that due to forced pit ventilation system the ventilation rate was increased 3.1 and 6.2% at capacity of 250 and 500 m³/h per cow respectively. The contribution of the system to the total ammonia removed from the building during winter, ranged from 31-35%, 16-19% and 11-8%, for wind speed of 1.0, 4.0 and 8.0 m/s respectively. Correspondingly, during summer, the contribution of the system ranged from 44-48%, 20-21% and 12-9%. Although obvious benefits arise from a forced pit ventilation system, the main mass flow of ammonia is still emitted trough the building ventilation openings, especially at high wind speeds.

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Precision livestock farming '09

ISBN:: 9789086866632

出版社:: Wageningen Academic

印刷出版日期:: 30 Oct 2009

Subjects
- Life Sciences
  - General
  - Animal & Veterinary

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Simulating the effect of forced pit ventilation on ammonia emission from a naturally ventilated cow house with CFD

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