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Nonisothermal moisture diffusion in porous building materials

Galbraith, G. H., R. C. McLean, Gillespie, J. Guol and D. Kelly
1998
Building Research & Information, 26(6), 330-339


Galbraith, G. H., R. C. McLean, Gillespie, J. Guol and D. Kelly, (1998), "Nonisothermal moisture diffusion in porous building materials", Building Research & Information, 26(6), 330-339.
Abstract:
The hygrothermal performance of building envelopes has been the subject of intensive research over

past decades culna6ting in the development of a series of.advanced computer-based simulation model.

However, in spite of the considerable progmss that has been made, questioil-'.which is 'not, as yet, ful resolved is the coupled effect of temperature gradient on moiiture diffusion rates..:As'a result, the material muport -data,tisqd,~as input for these models, is generally determined f~om - isothermal permelbili measurementl, . This -paper describes two investigations in which moisture flux experiments were carried out on smaff-"e niitnw samples subjected to gradients in both teinpirature and humidity. In each a different experimental technique was used and different materials wem't' ted. . Afi' analysis of the was undotd~en inlan-_attempt to identify the significance of any ven b-ansport comp the concentrai!kql~qtTo(ibooonenL


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Author Information and Other Publications Notes
Galbraith, G. H.
'Department of Bziilding & Stirz,eying, Glasgow Caledonian University, Cozvcaddens Road, Glasgow G4 OBA, UK E-mail: ghga@gcal.ac.iik
  1. Evaluation of discretized transport properties for numerical modelling of heat and moisture transfer in building structures
  2. Moisture permeability data presented as a mathematical relationship
  3. Non-contact methods of measuring moisture concentration in external layers of building partitions. I--The influence of geometrical microstructure on the kinetics of moisture condensation on glass surfaces
  4. The application of X-ray absorption to building moisture transport studies
  5. The determination of vapour and liquid transport coefficients as input to combined heat mass transfer models
  6. The effect of temperature on the moisture permeability of building materials
  7. The influence of space discretization on the accuracy of numerical simulation of heat and moisture transport in porous building materials
  8. The selection of appropriate flow potentials for moisture transport models
  9. The use of differential permeabilty in moisture transport modelling  
McLean, R. C.
Energy Systems Research Unit, Department of Mechanical Engineering, University of Strathclyde, Glasgow, UK
  1. A technique for the prediction of the conditions leading to mould growth in buildings
  2. Development of a simulation tool for mould growth prediction in buildings
  3. Evaluation of discretized transport properties for numerical modelling of heat and moisture transfer in building structures
  4. Moisture permeability data presented as a mathematical relationship
  5. Prediction of toxigenic fungal growth in buildings by using a novel modelling system
  6. The application of X-ray absorption to building moisture transport studies
  7. The determination of vapour and liquid transport coefficients as input to combined heat mass transfer models
  8. The effect of temperature on the moisture permeability of building materials
  9. The selection of appropriate flow potentials for moisture transport models
  10. The use of differential permeabilty in moisture transport modelling  
Gillespie, J. G.
     
Kelly, D.
  1. Evaluation of discretized transport properties for numerical modelling of heat and moisture transfer in building structures
  2. The use of differential permeabilty in moisture transport modelling  



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