Water vapor sorption measurements of common building materials
Richards, R.F., D.M. Burch and W.C. Thomas
1992
ASHRAE Transactions, 98(2), pp.475
Richards, R.F., D.M. Burch and W.C. Thomas, (1992), "Water vapor sorption measurements of common building materials", ASHRAE Transactions, 98(2), pp.475.
| Abstract: |
| Sorption isotherm measurements were came out for common building materials. 7he measure7nents were made by placing small specimens of the materials in pint-size jars above saturated salt-in-water solutions that gave various ambient relative humidities. The jars were kept at constant temperature until the enclosed specimens readied their steady-state equilibrium moisture content. 7he equilibrium moisture content ploued versus ambient relative humidity at a given temperature gave the sorption isotherm Separate sorption isotherms were obtaine4dfor specimens initially dry (adsorption isotherm) and for specimens initially saturated (desorption isotherm).
The materials included sugar pine, southern pine, exterior-grade plywood, waferboard siding, oriented strand board, particleboard, fiberboard sheathing, sturdy-brace fiberboard, kraft paper, foatn-core sheathing, plain gypsum board and vinyl-covered gypsum board
7he sorption measurements were compared to other measurements reported in the literature. Data from the present work were found to he below many of the previous-ly reported sorption measurements. However, the bias is small, less than 0. 05 kg/kg in all cases where equilibrium moisture contents ranged from 0 to 0. 30 kg/kg. 7he use of desiccant drying in this study versus oven drying in pre-vious studies is examined as a possible explanation. |
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