Moisture permeability measurements under reduced barometric pressures

Graham H. Galbraith, D. J. Kelly, R. Craig McLean

Research output: Contribution to journalArticle

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 languageEnglish
JournalMaterials and Structures
Publication statusPublished - 1 Jun 2004

Fingerprint

Moisture
Vapors
Liquids
Fluxes
Testing

Keywords

  • moisture permeability measurement
  • barometric pressures

Cite this

Galbraith, Graham H. ; Kelly, D. J. ; McLean, R. Craig. / Moisture permeability measurements under reduced barometric pressures. In: Materials and Structures. 2004.
@article{2972f8730bff4b2dae03c08c0b15a21b,
title = "Moisture permeability measurements under reduced barometric pressures",
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.",
keywords = "moisture permeability measurement, barometric pressures",
author = "Galbraith, {Graham H.} and Kelly, {D. J.} and McLean, {R. Craig}",
note = "Originally published in: Materials and Structures (2004), 37 (269), pp.311-317. Full text not available from this repository.",
year = "2004",
month = "6",
day = "1",
language = "English",
journal = "Materials and Structures",
issn = "1359-5997",
publisher = "Springer Netherlands",

}

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 journalArticle

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 -