Comparison of Direct vs. Indirect Ventilation Rate Determinations in Layer Barns using Manure Belts

dc.contributor.author Li, Hong
dc.contributor.author Gates, Richard
dc.contributor.author Liang, Yi
dc.contributor.author Xin, Hongwei
dc.contributor.author Wheeler, Eileen
dc.contributor.author Heber, Albert
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T04:14:07.000
dc.date.accessioned 2020-06-29T22:37:33Z
dc.date.available 2020-06-29T22:37:33Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2005
dc.date.embargo 2012-12-13
dc.date.issued 2005-01-01
dc.description.abstract <p>Direct measurement of building ventilation rate in livestock housing is a formidable task due to uncontrollable variations in fan and system performance that are caused by factors such as building static pressure, fan belt slippage, and dust accumulation on shutters and blades. Estimating building ventilation rate by an indirect method based on a CO2 balance offers a potentially viable alternative to direct measurement. The validity of the CO2 balance method depends on the validity of relationship between CO2 production inside the building and metabolic rate of the animals and the knowledge of CO2 generation by the housing environment. Metabolic rates of modern laying hens have recently been quantified in intensive large-scale laboratory measurements. However, performance of the indirect method remains to be evaluated under field conditions. This article compares building ventilation rates obtained by direct measurement and by a CO2 balance. The test was conducted at a commercial laying hen house that used manure belts with daily manure removal. The results indicate that ventilation rates estimated by the indirect method were not significantly different (P > 0.2) from those as determined by the direct measurement when the averaging or integration time interval was 2 h or longer. Careful application of the indirect method could greatly improve the affordability and versatility of endeavors toward quantifying air emissions from confined animal housing.</p>
dc.description.comments <p>This article is from <a href="http://elibrary.asabe.org/abstract.asp?aid=17950&t=3&dabs=Y&redir=&redirType=" target="_blank"><em>Transactions of the ASAE</em></a> 48, no. 1 (2005): 367–372.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/158/
dc.identifier.articleid 1156
dc.identifier.contextkey 3535766
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/158
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/894
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/158/Xin_2005_ComparisonDirectIndirect.pdf|||Fri Jan 14 20:46:38 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Air emissions
dc.subject.keywords Building ventilation rate
dc.subject.keywords CO2 balance
dc.subject.keywords Laying hen
dc.title Comparison of Direct vs. Indirect Ventilation Rate Determinations in Layer Barns using Manure Belts
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication a61fa792-56f2-4397-8a9c-8cbde8d5c3f1
relation.isAuthorOfPublication 36e0a8ce-fa2e-4df4-9f67-8d1717122650
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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