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Hygrothermal modelling for building energy simulation applications

Marijke Steeman (UGent)
(2010)
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(UGent) and (UGent)
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Abstract
Hygroscopic finishing materials and furniture in buildings are able to absorb and release water vapour if the relative humidity of the room increases or decreases. Numerous building applications require an accurate prediction of the indoor relative humidity already from the design stage. In currently available multizone BES tools the emphasis is mainly on the prediction of thermal comfort and energy use. So far they have not been well suited to describe moisture transfer processes in buildings and as a result the relative humidity is predicted in a simplified way. An important simplification is that the heat and mass balance are decoupled, which limits their applicability since the effect of temperature variations on vapour diffusion is neglected. HAM models on the other hand simultaneously solve the conservation equations for heat and mass transfer in complex porous building structures and are well suited to describe the hygrothermal interactions between the building air and porous surfaces. In this work a one dimensional transient HAM model is integrated with TRNSYS to account for the response of a multizone building on water vapour exchange with porous surfaces in a more detailed way. In contrast to simplified models the coupled model accounts for moisture-dependent conductivity and takes into account the effect of latent heat on the room heat balance. The coupled model was validated with both analytical and experimental results. This whole-building hygrothermal simulation approach is applicable to numerous building applications and can be used for the evaluation of humidity controlled HVAC systems for which a detailed prediction of the indoor relative humidity is essential. The coupled model is applied to gypsum cooled ceilings for which non-isothermal vapour transfer cannot be neglected, and for the evaluation of humidity controlled ventilation systems. As a case study the coupled model was used for the assessment and optimization of the indoor climate in a library building.
Keywords
HAM, moisture buffering, modelling, building energy simulation

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Citation

Please use this url to cite or link to this publication:

MLA
Steeman, Marijke. “Hygrothermal Modelling for Building Energy Simulation Applications.” 2010 : n. pag. Print.
APA
Steeman, M. (2010). Hygrothermal modelling for building energy simulation applications. Ghent University. Faculty of Engineering, Ghent, Belgium.
Chicago author-date
Steeman, Marijke. 2010. “Hygrothermal Modelling for Building Energy Simulation Applications”. Ghent, Belgium: Ghent University. Faculty of Engineering.
Chicago author-date (all authors)
Steeman, Marijke. 2010. “Hygrothermal Modelling for Building Energy Simulation Applications”. Ghent, Belgium: Ghent University. Faculty of Engineering.
Vancouver
1.
Steeman M. Hygrothermal modelling for building energy simulation applications. [Ghent, Belgium]: Ghent University. Faculty of Engineering; 2010.
IEEE
[1]
M. Steeman, “Hygrothermal modelling for building energy simulation applications,” Ghent University. Faculty of Engineering, Ghent, Belgium, 2010.
@phdthesis{924466,
  abstract     = {Hygroscopic finishing materials and furniture in buildings are able to absorb and release water vapour if the relative humidity of the room increases or decreases. Numerous building applications require an accurate prediction of the indoor relative humidity already from the design stage. In currently available multizone BES tools the emphasis is mainly on the prediction of thermal comfort and energy use. So far they have not been well suited to describe moisture transfer processes in buildings and as a result the relative humidity is predicted in a simplified way. An important simplification is that the heat and mass balance are decoupled, which limits their applicability since the effect of temperature variations on vapour diffusion is neglected. 
HAM models on the other hand simultaneously solve the conservation equations for heat and mass transfer in complex porous building structures and are well suited to describe the hygrothermal interactions between the building air and porous surfaces. In this work a one dimensional transient HAM model is integrated with TRNSYS to account for the response of a multizone building on water vapour exchange with porous surfaces in a more detailed way. In contrast to simplified models the coupled model accounts for moisture-dependent conductivity and takes into account the effect of latent heat on the room heat balance. The coupled model was validated with both analytical and experimental results.
This whole-building hygrothermal simulation approach is applicable to numerous building applications and can be used for the evaluation of humidity controlled HVAC systems for which a detailed prediction of the indoor relative humidity is essential. The coupled model is applied to gypsum cooled ceilings for which non-isothermal vapour transfer cannot be neglected, and for the evaluation of humidity controlled ventilation systems. As a case study the coupled model was used for the assessment and optimization of the indoor climate in a library building.},
  author       = {Steeman, Marijke},
  isbn         = {9789085783343},
  keywords     = {HAM,moisture buffering,modelling,building energy simulation},
  language     = {eng},
  pages        = {XIX, 165},
  publisher    = {Ghent University. Faculty of Engineering},
  school       = {Ghent University},
  title        = {Hygrothermal modelling for building energy simulation applications},
  url          = {http://lib.ugent.be/fulltxt/RUG01/001/387/954/RUG01-001387954_2010_0001_AC.pdf},
  year         = {2010},
}