Functional Performance Evaluation of a Novel Thermal Environment Sensor Array

dc.contributor.author Harmon, Jay
dc.contributor.author Ramirez, Brett
dc.contributor.author Ramirez, Brett
dc.contributor.author Gao, Y.
dc.contributor.author Hoff, Steven
dc.contributor.author Harmon, Jay
dc.contributor.author Hoff, Steven
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2019-03-12T12:01:21.000
dc.date.accessioned 2020-06-29T22:36:08Z
dc.date.available 2020-06-29T22:36:08Z
dc.date.copyright Mon Jan 01 00:00:00 UTC 2018
dc.date.issued 2018-01-01
dc.description.abstract <p>The thermal environment (TE) inside livestock and poultry facilities has a substantial impact on animal growth performance and facility energy usage; therefore, the TE must be quantified correctly to maintain the optimal TE that maximizes feed efficiency and consumes minimal resources. To achieve this goal, a TE sensor array (TESA) and accompanying data acquisition system were previously developed to measure dry-bulb temperature (tdb), black globe temperature, airspeed, and relative humidity (RH). While measurement of each parameter is useful individually, it is more informative when they are combined to estimate and assess the total impact that the TE has on an animal. Hence, the objectives of this study were to (1) design, construct, and commission a TE simulation system, named the Animal Thermal Environment Replication and Measurement System (AThERMS), and (2) compare total sensible heat loss estimated by TESA to a reference ideal temperature source (ITS) when subjected to different TE conditions inside AThERMS. AThERMS is a 1.04 × 1.17 × 1.04 m chamber inside a large insulated enclosure in which air supplied by an air handling unit provides unique combinations of tdb, RH, and airspeed while independently controlling chamber surface temperature (ts). Commissioning of AThERMS included qualitative (smoke visualization) and quantitative (three-dimensional traverse) velocity characterizations in the central region of the chamber and verification of similar and stable ts for all six surfaces. Analysis of velocity contours at three nominal flow rates indicated steady patterns, and at three nominal ts values (13°C, 23°C, and 33°C) during 2 h steady-state operation, the maximum average difference between any two of the six surface ts values was 0.26°C. The TESA was then suspended in AThERMS adjacent to the ITS (15.24 cm diameter black copper sphere with a heater immersed in water). The ITS and TESA were subjected to two nominal airspeeds (~0.5 and 2.0 m s-1) at three nominal tdb values (17°C, 25°C, and 33°C) with a mean radiant temperature approximately equal to the nominal tdb. Total heat loss was estimated from heat transfer theory with TESA measurements as inputs and compared to the measured root mean square power required to maintain a constant water temperature in the ITS. Overall, predicted total heat loss underestimated measured power for all six tests. Future work needs to improve the measurement accuracy at low total heat losses. AThERMS can be used to simulate different TEs that an animal may experience and provide steady reference conditions to verify TE measurements. The TESA is a novel and effective tool for understanding the TE distribution and estimating total heat loss.</p>
dc.description.comments <p>This article is published as Ramirez, Brett C., Yun Gao, Steven J. Hoff, and Jay D. Harmon. "Functional Performance Evaluation of a Novel Thermal Environment Sensor Array." <em>Transactions of the ASABE </em>61, no. 3 (2018): 1077-1088. DOI: <a href="http://dx.doi.org/10.13031/trans.12514" target="_blank">10.13031/trans.12514</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/1008/
dc.identifier.articleid 2292
dc.identifier.contextkey 13956152
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/1008
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/705
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/1008/2018_HoffSteven_FunctionalPerformance.pdf|||Fri Jan 14 18:13:05 UTC 2022
dc.source.uri 10.13031/trans.12514
dc.subject.disciplines Agriculture
dc.subject.disciplines Animal Sciences
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Black globe
dc.subject.keywords Data acquisition
dc.subject.keywords Swine
dc.subject.keywords Ventilation
dc.title Functional Performance Evaluation of a Novel Thermal Environment Sensor Array
dc.type article
dc.type.genre article
dspace.entity.type Publication
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