Rammed Earth Building: Contribution of Moisture Transfer on Indoor Comfort
Bâtiment en pisé : contribution du transfert de vapeur sur le confort intérieur
Résumé
To date, only a few scientific articles have quantified by numerical calculation the impact that the hygroscopic character of raw earth, often cited as one of the main advantages of the material, can have on the comfort of the building's occupants. To better quantify this effect, simulations of a building with rammed earth walls subjected to realistic meteorological conditions are performed on the EnergyPlus TM building energy simulation software and its coupled hygrothermal transfer module: HAMT. The simulations output parameters likely to be impacted by moisture transfer and its coupling with heat transfer are studied: temperatures, humidity, and a standardised comfort indicator: the PMV (Predicted Mean Vote). In particular, the evolutions of the previously mentioned outputs are compared through a parametric study.
The varying input parameter studied is the type of possible transfer between earthen walls and their surroundings. We examine two transfer possibilities: hygrothermal coupled transfers, involving thermal and hydric interactions between walls and their surroundings, and pure heat transfers with disabled hydric interactions. Both possibilities employ identical models and resolution algorithms. Pure heat transfer represents hygrothermal transfer devoid of water exchange coefficients. The parametric study is conducted by varying the number of earthen walls able to have hygrothermal exchanges with their surroundings. This paper concludes that consideration of moisture transfer and its coupling with heat transfer between earthen walls and their surroundings has little effect on temperatures and PMV, but contributes significantly to the regulation of indoor relative humidity.
Origine | Fichiers produits par l'(les) auteur(s) |
---|---|
Licence |