Variable Rate Heater Control for Livestock Space Heating Harmon, Jay van Utrecht, David Hoff, Steven Harmon, Jay Hoff, Steven
dc.contributor.department Agricultural and Biosystems Engineering 2018-02-13T03:56:53.000 2020-06-29T22:36:04Z 2020-06-29T22:36:04Z Tue Jan 01 00:00:00 UTC 2002 2012-12-10 2002-01-01
dc.description.abstract <p>An unvented liquid propane–gas (LP) space heater, often used in animal housing, was modified to provide automated variable heat output. As manufactured, the heater had manually–adjusted output settings between 14.7 and 29.3 kW (50,000 and 100,000 Btu/h). The heater was modified by adding a stepper motor and speed reducer to the manual proportioning valve to provide continuous and automated heater output adjustment between 14.7 and 29.3 kW.<br /><br />Experiments were conducted to compare animal occupied zone (AOZ) velocities, AOZ temperatures, and fuel consumption using on/off and automated variable control modes. These experiments were conducted using inside set point and ambient air temperature differences of 14 and 28C (25 and 50F). All experiments were conducted in the Air Dispersion Laboratory at Iowa State University.<br /><br />Adding automated variable control reduced the AOZ temperature fluctuations from 5.3C (on/off) to 1.1C (9.5 to 2.0F). In the AOZ, the standard deviation across the entire test room was reduced from 1.4C (on/off) to 0.3C (2.6 to 0.5F). The AOZ airspeed fluctuations were reduced from 10 cm/s (on/off) to 2 cm/s (20 to 4 ft/min). No differences were found in fuel consumption. Results indicate a need for heaters capable of continuous adjustment to even lower energy output levels.</p>
dc.description.comments <p>Journal Paper No. J–18687 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa, Project No. 3140, and supported by Hatch Act and State of Iowa funds</p> <p>This article is from <a href="" target="_blank"><em>Applied Engineering in Agriculture</em></a> 18, no. 2 (2002): 245–253.</p>
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dc.identifier archive/
dc.identifier.articleid 1105
dc.identifier.contextkey 3526220
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/100
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 18:11:15 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Automated Control
dc.subject.keywords Space Heat
dc.subject.keywords Liquid Propane
dc.subject.keywords Efficiency
dc.title Variable Rate Heater Control for Livestock Space Heating
dc.type article
dc.type.genre article
dspace.entity.type Publication
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