Abstract
The successful application of modern hygrothermal simulation models to building envelopes requires accurate values of moisture permeability. Unfortunately, the generation of reliable data is sometimes not possible using the currently-applied gravimetric test methods, because of the extremely long test periods which can be involved. In addition, these test methods are incapable of separating the total mass flow into its vapour and liquid components, the individual transfer coefficients which are required for the complete description of the moisture transmission process. This paper introduces a new approach to permeability measurement, which has been developed to overcome these deficiencies. It involves testing under reduced barometric pressures, which allows a rapid evaluation of permeability, together with the identification of the separate vapour and liquid fluxes. The new approach is validated through the presentation of experimental results for five building materials, which are compared with benchmark data on the same materials obtained from standard tests.
| Original language | English |
|---|---|
| Journal | Materials and Structures |
| Publication status | Published - 1 Jun 2004 |
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Keywords
- moisture permeability measurement
- barometric pressures
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Moisture permeability measurements under reduced barometric pressures. / Galbraith, Graham H.; Kelly, D. J.; McLean, R. Craig.
In: Materials and Structures, 01.06.2004.Research output: Contribution to journal › Article
TY - JOUR
T1 - Moisture permeability measurements under reduced barometric pressures
AU - Galbraith, Graham H.
AU - Kelly, D. J.
AU - McLean, R. Craig
N1 - Originally published in: Materials and Structures (2004), 37 (269), pp.311-317. Full text not available from this repository.
PY - 2004/6/1
Y1 - 2004/6/1
N2 - The successful application of modern hygrothermal simulation models to building envelopes requires accurate values of moisture permeability. Unfortunately, the generation of reliable data is sometimes not possible using the currently-applied gravimetric test methods, because of the extremely long test periods which can be involved. In addition, these test methods are incapable of separating the total mass flow into its vapour and liquid components, the individual transfer coefficients which are required for the complete description of the moisture transmission process. This paper introduces a new approach to permeability measurement, which has been developed to overcome these deficiencies. It involves testing under reduced barometric pressures, which allows a rapid evaluation of permeability, together with the identification of the separate vapour and liquid fluxes. The new approach is validated through the presentation of experimental results for five building materials, which are compared with benchmark data on the same materials obtained from standard tests.
AB - The successful application of modern hygrothermal simulation models to building envelopes requires accurate values of moisture permeability. Unfortunately, the generation of reliable data is sometimes not possible using the currently-applied gravimetric test methods, because of the extremely long test periods which can be involved. In addition, these test methods are incapable of separating the total mass flow into its vapour and liquid components, the individual transfer coefficients which are required for the complete description of the moisture transmission process. This paper introduces a new approach to permeability measurement, which has been developed to overcome these deficiencies. It involves testing under reduced barometric pressures, which allows a rapid evaluation of permeability, together with the identification of the separate vapour and liquid fluxes. The new approach is validated through the presentation of experimental results for five building materials, which are compared with benchmark data on the same materials obtained from standard tests.
KW - moisture permeability measurement
KW - barometric pressures
M3 - Article
JO - Materials and Structures
JF - Materials and Structures
SN - 1359-5997
ER -