Commissioning of a Novel Animal Thermal Environment Replication and Measurement System

dc.contributor.author Harmon, Jay
dc.contributor.author Ramirez, Brett
dc.contributor.author Ramirez, Brett
dc.contributor.author Hoff, Steven
dc.contributor.author Gao, Yun
dc.contributor.author Hoff, Steven
dc.contributor.author Harmon, Jay
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-16T21:01:38.000
dc.date.accessioned 2020-06-29T22:34:32Z
dc.date.available 2020-06-29T22:34:32Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2015
dc.date.embargo 2015-08-06
dc.date.issued 2015-07-01
dc.description.abstract <p>Thermal environment (TE) in livestock production systems effects the animal’s thermal comfort, feed efficiency, and the producer’s operating costs. Accurate assessment of the radiative component of TE requires Mean Radiant Temperature (t<sub>mr</sub>) measurement with a Black Globe Thermometer (BGT); however, these devices are cost prohibitive (if multiple are needed), have limited commercial availability, and lack confidence for a range of conditions commonly found in a swine facility. The objectives were to design, construct and commission a novel and well-documented TE simulation system named Animal Thermal Environment Replication and Measurement System (AThERMS). Simulations of different combinations of dry-bulb temperature, relative humidity, and airspeeds while independently controlling chamber surface temperature (t<sub>s</sub>) can be evaluated. AThERMS is a 1.04 x 1.17 x 1.04 m chamber inside a large Insulated Enclosure (IE) where air supplied by an air handling unit provides unique TEs to both AThERMS and the IE. Commissioning of AThERMS prior to BGT assessment included a qualitative (smoke visualization) and quantitative (three-dimensional traverse and CFD model) velocity characterization in the central region of the chamber and verification of similar and stable t<sub>s</sub> for all six surfaces. Analysis of velocity contours sliced in different x, y, z planes surrounding the BGT at three nominal flowrates indicated steady patterns and helped guide placement of the airspeed sensor used to derive the impact of convection on measured BGT temperature. Results also showed at three nominal t<sub>s</sub> (13°C, 23°C, and 33°C), during a 2 h steady state operation, that maximum mean difference between any two t<sub>s</sub> measured by six digital IR sensors was 0.26°C with standard deviations less than 0.11°C. Determination of the time constant (t) for cooling and heating the surfaces showed the time to reach steady-state (3t, ~95%) to be 85.4 and 42 min, respectively. AThERMS can be used to simulate different TEs a housed animal may experience and function as a reference to calibrate or verify TE measurements.</p>
dc.description.comments <p>This proceeding is from 2015 ASABE Annual International Meeting, Paper No. 152177429, pages 1-13 (doi: <a href="http://dx.doi.org/10.13031/aim.20152177429" target="_blank">10.13031/aim.20152177429</a>). St. Joseph, Mich.: ASABE.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_conf/458/
dc.identifier.articleid 1434
dc.identifier.contextkey 7423638
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_conf/458
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/491
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_conf/458/2015_Ramirez_CommissioningNovel.pdf|||Sat Jan 15 00:21:37 UTC 2022
dc.source.uri 10.13031/aim.20152177429
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords black globe
dc.subject.keywords environment
dc.subject.keywords livestock
dc.subject.keywords thermal
dc.subject.keywords radiation
dc.title Commissioning of a Novel Animal Thermal Environment Replication and Measurement System
dc.type article
dc.type.genre conference
dspace.entity.type Publication
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