An experimental apparatus for the measurement of sorption isotherms of moisture in porous building materials

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dc.contributor.authorPeters, Richard Edwarden
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:45:41Zen
dc.date.adate2009-09-12en
dc.date.available2014-03-14T21:45:41Zen
dc.date.issued1992en
dc.date.rdate2009-09-12en
dc.date.sdate2009-09-12en
dc.description.abstractAn experimental apparatus and test procedure to measure the sorption isotherm of moisture in porous building materials was developed and tested for its reliability and accuracy. The apparatus shows excellent potential for determining reliable moisture storage property data. The data are used in heat and moisture transport models. The apparatus consists of a small test chamber, with an external forced-air temperature and humidity conditioning system. The conditioning system supplies moist air to the test chamber at 20°C dry-bulb temperature over a range of 0.4 to 85 per cent relative humidity. The new system circumvents problems associated with the use of saturated salt-in-water solutions. Moisture content is determined gravimetrically without removing specimens from their conditioned environment. The mass is monitored in situ such that external ambient conditions have no effect on the data. The control of test chamber relative humidity and dry-bulb temperature is automated. Test results consisting of sorption isotherms and scanning curves for sugar pine, southern pine, and an exterior grade plywood are presented. The maximum uncertainty in moisture content measurement is 0.023 kg/kg-dry mass at 85 per cent RH. Results are compared to data from the literature. The study shows a need for a standard test method for measuring sorption isotherms. Minimum recommendations for such a standard test method are included. A comparison of scanning data to an analytical model from the literature show that further investigation of scanning is needed. The present method is well suited for such a study.en
dc.description.degreeMaster of Scienceen
dc.format.extentix, 76 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-09122009-040234en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09122009-040234/en
dc.identifier.urihttp://hdl.handle.net/10919/44731en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1992.P474.pdfen
dc.relation.isformatofOCLC# 27568346en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1992.P474en
dc.subject.lcshAbsorptionen
dc.subject.lcshAdsorptionen
dc.subject.lcshBuilding materials -- Moistureen
dc.titleAn experimental apparatus for the measurement of sorption isotherms of moisture in porous building materialsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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