Testing the Potential for an Earth Tube and Water-to-Air Heat Exchanger System for the Cooling and Heating of Greenhouses

dc.contributor.authorBow, Charlesen
dc.contributor.committeechairWelbaum, Gregory E.en
dc.contributor.committeememberBurchett, Gregoryen
dc.contributor.committeememberScoggins, Holly L.en
dc.contributor.departmentHorticultureen
dc.date.accessioned2015-02-18T19:36:33Zen
dc.date.available2015-02-18T19:36:33Zen
dc.date.issued2011-12en
dc.description.abstractThe efficacy of an earth tube used conjointly with a water-to-air heat exchanger for greenhouse environmental control was tested in Riverside, CA. Greenhouses by their nature with large surface area and minimal insulation to block thermo radiation make temperature maintenance difficult when ambient temperatures are outside the optimum range. The air within the test greenhouse, a small 2.13 m x 2.13 m x 3.66 m (7’ x 7’ x 12’) reinforced nylon mesh vinyl-covered unit, was drawn in through one end of the earth tube and blown out the opposing end, then moved through a water-to-air heat exchanger to aid in greenhouse temperature management. Pumped water from a well went through the water-to-air heat exchanger, delivering the heat transferable charge to reduce/increase the thermal load of the greenhouse. The earth tube placed 2.44 meters (8 ft.) below the surface offered additional heat transfer to further assist with an ideal greenhouse environment. The study demonstrated that an earth tube combined with a water-to-air heat exchanger achieved a temperature drop between air entry and exit points of about -1.1°C (30°F) on an August day with outdoor temperature of 41.1°C (106°F).en
dc.description.degreeMALSen
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttp://hdl.handle.net/10919/51535en
dc.language.isoenen
dc.publisherVirginia Techen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectgreenhouseen
dc.subjectenvironmental controlen
dc.subjectthermal regulationen
dc.subjectearth tubesen
dc.subjectwater-to-heat air exchangersen
dc.titleTesting the Potential for an Earth Tube and Water-to-Air Heat Exchanger System for the Cooling and Heating of Greenhousesen
dc.typeMaster's projecten
dc.type.dcmitypeTexten
thesis.degree.disciplinePlant Science and Pest Managementen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Agricultural and Life Sciencesen
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