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The determination of vapour and liquid transport coefficients as input to combined heat mass transfer models

Galbraith, G. H. and Mclean, R.C
1993
BS'93, pp. 413-419

Galbraith, G. H. and Mclean, R.C, (1993), "The determination of vapour and liquid transport coefficients as input to combined heat mass transfer models", BS'93, pp. 413-419.
Abstract:
The predication of the effects of moisture in buildings is now a well established part of the building design process. A significant internation al effort is taking place to develop combined heat and mass transfer models which will enable the thermal and hygic performance of building envelopes to be more accurately assessed. Howerver, the unversal solution of the defining equations requires the separation of the total moisture flow into its liquid and vapour components for any specified set of humidigy conditions. Up till now this has not been possible and partial model solutions have required the premise that liquid water flow in porous building materials only becomes significant at humidities approaching ?% Such an assemuption is simplistic and clearly at variance with the body of experimental evidence. This paper presents and analytical and experimental procedure wiich allows the transport parameters defining liquid and vapour flow to be described for any given materials functions of relative humidigy. Such information allows for a complete model solution without recourse to questionable assumptions rgarding the initiation of capillary condensation.

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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. Nonisothermal moisture diffusion in porous building materials
  5. The application of X-ray absorption to building moisture transport studies
  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. Nonisothermal moisture diffusion in porous building materials
  6. Prediction of toxigenic fungal growth in buildings by using a novel modelling system
  7. The application of X-ray absorption to building moisture transport studies
  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  


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