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Sensitivity analysis of CFD coupled non-isothermal heat and moisture modelling

Belleghem, M. V., Steeman, H., Steeman, M., Janssens, A. and Paepe, M.
2010
Building and Environment, In Press, Corrected Proof, Available online, 2010

Belleghem, M. V., Steeman, H., Steeman, M., Janssens, A. and Paepe, M., (2010), "Sensitivity analysis of CFD coupled non-isothermal heat and moisture modelling", Building and Environment, In Press, Corrected Proof, Available online, 2010.
Abstract:
CFD (Computational Fluid Dynamics) is a useful tool to study air flow patterns in a room. Current CFD models are able to simulate air flow combined with temperature distributions and species distributions. In this paper a coupled CFD-HAM model is discussed. This model combines CFD with a HAM model (Heat, Air and Moisture) for hygroscopic materials. This coupled model is able to simulate air flow around a porous material and combines this with heat and moisture transport in the porous material. Validation with a small scale experiment in which gypsum board was used as a hygroscopic material showed good results. In this paper a further validation of the model is discussed based on a sensitivity analysis of some model parameters. Especially hygrothermal parameters like sorption isotherm and water vapour permeability proved to have a non negligible influence on the modelling outcome. Adding a hysteresis model showed improvement of the model during desorption. The model was also used to compare two modelling strategies. In one strategy the gypsum board was modelled as a uniform material, in a second approach the material was modelled as being layered. The difference between the two approaches showed to be negligible.

Keywords: CFD; Heat and moisture transport; Modelling; Sensitivity; Non-isothermal

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Author Information and Other Publications Notes
Belleghem, M. V.
  1. Benchmark experiments for moisture transfer modelling in air and porous materials
  2. Evaluation of the different definitions of the convective mass transfer coefficient for water evaporation into air
  3. Experimental validation and sensitivity analysis of a coupled BES-HAM model
  4. On coupling 1D non-isothermal heat and mass transfer in porous materials with a multizone building energy simulation model  
Steeman, H.
  1. CFD modelling of HAM transport in buildings: The importance of local indoor climate
  2. Coupled simulation of heat and moisture transport in air and porous materials for the assessment of moisture related damage
  3. Evaluation of the different definitions of the convective mass transfer coefficient for water evaporation into air
  4. Modelling indoor air and hygrothermal wall interaction in building simulation: Comparison between CFD and a well-mixed zonal model
  5. On coupling 1D non-isothermal heat and mass transfer in porous materials with a multizone building energy simulation model
  6. On the applicability of the heat and mass transfer analogy in indoor air flows  
Steeman, M.
  1. Benchmark experiments for moisture transfer modelling in air and porous materials
  2. Experimental validation and sensitivity analysis of a coupled BES-HAM model
  3. Impact of whole-building hygrothermal modelling on the assessment of indoor climate in a library building
  4. On coupling 1D non-isothermal heat and mass transfer in porous materials with a multizone building energy simulation model
  5. The effect of combining a relative-humidity-sensitive ventilation system with the moisture-buffering capacity of materials on indoor climate and energy efficiency of buildings  
Janssens, A.
Building Physics, Construction and Services http://aivwww.rug.ac.be/Onderzoeksbeleid/techno2002/EN/TW/I-TW01V02.htm
  1. Application of a new type of air and vapor retarder in a self-drying sloped roof with a cathedral ceiling
  2. Benchmark experiments for moisture transfer modelling in air and porous materials
  3. CFD modelling of HAM transport in buildings: The importance of local indoor climate
  4. Condensation risk assessment
  5. Coupled simulation of heat and moisture transport in air and porous materials for the assessment of moisture related damage
  6. Evaluation of the different definitions of the convective mass transfer coefficient for water evaporation into air
  7. Experimental validation and sensitivity analysis of a coupled BES-HAM model
  8. Heat and moisture response of vented and compact cathedral ceilings: a test house evaluation
  9. Impact of whole-building hygrothermal modelling on the assessment of indoor climate in a library building
  10. Inquiry on HAMCAT codes
  11. Modelling indoor air and hygrothermal wall interaction in building simulation: Comparison between CFD and a well-mixed zonal model
  12. On coupling 1D non-isothermal heat and mass transfer in porous materials with a multizone building energy simulation model
  13. On the applicability of the heat and mass transfer analogy in indoor air flows
  14. Reliable control of interstitial condensation in lightweight roof systems, calculation and assessment methods  
Paepe, M.
  1. Benchmark experiments for moisture transfer modelling in air and porous materials
  2. CFD modelling of HAM transport in buildings: The importance of local indoor climate
  3. Coupled simulation of heat and moisture transport in air and porous materials for the assessment of moisture related damage
  4. Evaluation of the different definitions of the convective mass transfer coefficient for water evaporation into air
  5. Experimental validation and sensitivity analysis of a coupled BES-HAM model
  6. Impact of whole-building hygrothermal modelling on the assessment of indoor climate in a library building
  7. On coupling 1D non-isothermal heat and mass transfer in porous materials with a multizone building energy simulation model
  8. On the applicability of the heat and mass transfer analogy in indoor air flows  


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