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Modelling of hysteresis influence on mass transfer in building materials

Kwiatkowski, J., Woloszyn, M., Roux, J.
2009
Building and Environment, 44(3): 633-642
Hysteresis; Sorption; Mass transfer; Humidity; Modelling; Sensitivity, Hysteresis; Sorption; Mass transfer; Humidity; Modelling; Sensitivity

Kwiatkowski, J., Woloszyn, M., Roux, J., (2009), "Modelling of hysteresis influence on mass transfer in building materials", Building and Environment, 44(3): 633-642.
Abstract:
The processes of mass transfer in the material influence not only the conditions within the material but also inside the connected air spaces. A new module for precise representation of mass transfer in materials in contact with the indoor air, called Humi-mur, was elaborated and validated in this work. It allows for the precise representation of sorption isotherm and vapour permeability dependence on relative humidity. Also the sorption curve hysteresis has been implemented. The new module was then applied to estimate the sensitivity of the results to uncertainty in measured material properties and the impact of hysteresis effect. Reasonable estimation of experimental uncertainty resulted in the deviation of approximately 6% in the calculated results. Hysteresis quite strongly influences the dynamic behaviour of materials. Concerning hysteresis in the sorption isotherm, we showed that the average of the adsorption and desorption equations is a reasonable approximation of mean behaviour for coarse calculation. In case when precise results of the relative humidity (absolute humidity) are needed, the hysteresis effect should be taken into account.

Keywords: Hysteresis; Sorption; Mass transfer; Humidity; Modelling; Sensitivity

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Author Information and Other Publications Notes
Kwiatkowski, J.
     
Woloszyn, M.
  1. eds. Annex 41 Final Report, Volume 1: Modelling Principles and Common Exercises
  2. Investigation of Microclimate by CFD Modeling of Moisture Interactions between Air and Constructions
  3. Moisture propagation in multizone buildings proposition of a coupled energy-moisture-airflow model
  4. 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
  5. Tools for performance simulation of heat, air and moisture conditions of whole buildings  
Roux, J.
  1. A review on phase change materials integrated in building walls
  2. Energy saving and environmental resources potentials: Toward new methods of building design  


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