Simulated and Measured Effect of Rectangular Obstructions on Carbon Dioxide Gas Dispersion in a Scaled Swine Building Hoff, Steven Li, Junping Hoff, Steven Tsao, Ling-Ling
dc.contributor.department Agricultural and Biosystems Engineering 2018-02-13T10:15:42.000 2020-06-29T22:39:02Z 2020-06-29T22:39:02Z Sun Jan 01 00:00:00 UTC 1995 2013-04-30 1995
dc.description.abstract <p>Gas dispersion from shallow manure storage pits was experimentally measured and mathematically modeled in a 1:6-scale ventilation chamber. The chamber represents a geometrically scaled model of a production swine grower facility. Gas injection was simulated from shallow pits using carbon dioxide (CO2). The results indicate significant differences in gas concentration between the animal-occupied zone (AOZ) and human-occupied zones (HOZ), especially at ventilation rates representative of mild weather conditions. AOZ CO2 concentrations were 12 times higher than HOZ during minimum ventilation conditions and six times higher during mild weather ventilation conditions. Large variations in normalized CO2 concentration were found as a function of both vertical location from the floor and horizontal location from the inlet, especially at vertical locations representative of the AOZ. Rectangular obstructions, physically representing the overall size of 60 kg pigs, did significantly (p < 0.01) affect gas dispersion at high ventilation rates, but did not significantly (p > 0.05) affect gas dispersion at low ventilation rates, implying that airflow patterns near the AOZ were significantly affected by the presence of rectangular obstructions at high ventilation rates. The mathematical model provided excellent prediction of the measured results. Vertical profiles were closely predicted with large gradients near the floor, in agreement with the measured results.</p>
dc.description.comments <p>This article is from <em>Transactions of the ASAE </em>38, no. 5 (1995): <a href="" target="_blank">1519–1532</a>.</p>
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dc.identifier archive/
dc.identifier.articleid 1645
dc.identifier.contextkey 4090506
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/340
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 23:41:26 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Swine building
dc.subject.keywords Ventilation
dc.subject.keywords Carbon dioxide
dc.subject.keywords Modeling
dc.title Simulated and Measured Effect of Rectangular Obstructions on Carbon Dioxide Gas Dispersion in a Scaled Swine Building
dc.type article
dc.type.genre article
dspace.entity.type Publication
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relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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