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Evaluation of discretized transport properties for numerical modelling of heat and moisture transfer in building structures

Galbraith, G. H., Li, J., Guo, J., Kelly, D., Mclean, R. C. and Grunewald, J.
2001
Journal of Thermal Envelope and Building Science, v24, n3, p 240-260

Galbraith, G. H., Li, J., Guo, J., Kelly, D., Mclean, R. C. and Grunewald, J., (2001), "Evaluation of discretized transport properties for numerical modelling of heat and moisture transfer in building structures", Journal of Thermal Envelope and Building Science, v24, n3, p 240-260.
Abstract:

Over the past decade, a large number of numerical models have been developed to predict heat and moisture transfer within building envelopes. In these models, the moisture transfer mechanism has been described and correlated by reference to the various transport phenomena and corresponding theories, viz. heat transfer and fluid flow. However, predicting the coupled heat and moisture performance of a building construction has never been a straightforward task, since a steady state situation hardly ever occurs and the transport properties (heat and moisture) of a material vary with moisture content and temperature. This paper discusses the transport phenomenon and the various numerical algorithms used in the discretization equations and how different algorithms affect the modelled results. Computer simulations have been conducted for different building materials and material combinations and comparisons have been made to evaluate the selection of discretized transport properties. Discrepancies in results are demonstrated between different mathematical interpolations, namely the Resistance (R) type formula and Linear (L) interpolation. Recommendations are given as guidance towards applying the most appropriate formulations for a given modelling scenario.
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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. Moisture permeability data presented as a mathematical relationship
  2. 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
  3. Nonisothermal moisture diffusion in porous building materials
  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  
Li, J.
  1. Effects of damp and mould in the home on respiratory health: a review of the literature
  2. The influence of space discretization on the accuracy of numerical simulation of heat and moisture transport in porous building materials
  3. Web-based integrated project control system  
Guo, J.
  1. Moisture permeability data presented as a mathematical relationship
  2. The effect of temperature on the moisture permeability of building materials
  3. The selection of appropriate flow potentials for moisture transport models
  4. The use of differential permeabilty in moisture transport modelling  
Kelly, D.
  1. Nonisothermal moisture diffusion in porous building materials
  2. 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. Moisture permeability data presented as a mathematical relationship
  4. Nonisothermal moisture diffusion in porous building materials
  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  
Grunewald, J.
Technology University of Dresden, Faculty of Architecture, Institute of Building Climatology Zellescher Weg 17, 01069 Dresden
  1. A two-levelled hygrothermal material database for the numerical simulation program DELPHIN4
  2. Documentation of the Numerical Simulation Program DIM3.1, Volume 1: Theoretical Fundamentals
  3. Modified cup for testing of water vapour transmission through thick, permeable materials
  4. Numerical and experimental investigation of coupled heat and moisture transport problems
  5. On the hysteresis in moisture storage and conductivity measured by the instantaneous profile method
  6. Position paper on material characterization and HAM model benchmarking
  7. Towards an engineering model of material characteristics for input to ham transport simulations - Part 1: an approach  


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