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Numerical and experimental investigation of coupled heat and moisture transport problems

Grunewald, J., Plagge, R. and H?upl, P.
2001
Proceedings for Performance of Exterior Envelopes of Whole Buildings VIII: Integration of Building Envelopes, December 2-7, Clearwater Beach, Florida

Grunewald, J., Plagge, R. and H?upl, P., (2001), "Numerical and experimental investigation of coupled heat and moisture transport problems", Proceedings for Performance of Exterior Envelopes of Whole Buildings VIII: Integration of Building Envelopes, December 2-7, Clearwater Beach, Florida.
Abstract:

This paper describes a general thermodynamic model, including the constitutive equations, and applies it to the coupled heat and moisture transfer in porous building materials. The resulting balance equation system and the constitutive equations for the quantities considered can be numerically solved. The constitutive equations describe the phase-divided moisture transport (liquid water flux and water vapor diffusion/advection) leading into phase-divided defined hygric transport coefficients of the balance equation system. Currently, it is impossible to separate liquid water flux and water vapor transport experimentally. To circumvent these difficulties, moisture conductivities and a phase-dividing function are introduced. For a known phase-dividing function, the phase-divided defined transport coefficients of the balance equation system can be calculated from the measured moisture conductivities. The paper presents a numerical investigation of a phase-dividing function evaluation and a description of laboratory experiments required for material characterization.
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Author Information and Other Publications Notes
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. Evaluation of discretized transport properties for numerical modelling of heat and moisture transfer in building structures
  4. Modified cup for testing of water vapour transmission through thick, permeable materials
  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  
Plagge, R.
Institute of Building Climatology, Faculty of Architecture, University of Technology, Dresden, Germany.
  1. A comparison of different techniques to quantify moisture content profiles in porous building materials
  2. A two-levelled hygrothermal material database for the numerical simulation program DELPHIN4
  3. Analysis of selected water absorption coefficient measurements
  4. On the hysteresis in moisture storage and conductivity measured by the instantaneous profile method  
H?upl, P.
Institute of Building Climatology, Faculty of Architecture, University of Technology, Dresden, Germany.
  1. A two-levelled hygrothermal material database for the numerical simulation program DELPHIN4
  2. Towards an engineering model of material characteristics for input to ham transport simulations - Part 1: an approach  


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