TY - JOUR
T1 - Non-isothermal Moisture Transport Through Insulation Materials
AU - Peuhkuri, Ruut Hannele
AU - Rode, Carsten
AU - Hansen, Kurt Kielsgaard
PY - 2008
Y1 - 2008
N2 - An experimental investigation was conducted in order to draw some conclusions on the magnitude of moisture transport due to temperature gradient on a range of porous light-weight building materials. A special constructed non-isothermal set-up allowed the creation of a temperature gradient of 10K and given humidity gradient over the sample. The resulting moisture ux as well as the hygrothermal states around and within the material were monitored.
The hypothesis of relative humidity being a driving force for non-isothermal moisture transport already in the hygroscopic range could not be confirmed. On the contrary, indications exist that the temperature gradient itself is driving the moisture from the warm side towards the cold side. An attempt to identify and quantify the single contributions of the different transport forms involved is also presented. The diferent results gave, however, diverging conclusions and therefore the question about existence of the type of transport forms driven by the non-isothermal effects remains open. Rather surprisingly, all the materials, including the almost non-hygroscopic materials (e.g. rock wool) and very hygroscopic materials (e.g. cellulose insulation) showed the same characteristics.
AB - An experimental investigation was conducted in order to draw some conclusions on the magnitude of moisture transport due to temperature gradient on a range of porous light-weight building materials. A special constructed non-isothermal set-up allowed the creation of a temperature gradient of 10K and given humidity gradient over the sample. The resulting moisture ux as well as the hygrothermal states around and within the material were monitored.
The hypothesis of relative humidity being a driving force for non-isothermal moisture transport already in the hygroscopic range could not be confirmed. On the contrary, indications exist that the temperature gradient itself is driving the moisture from the warm side towards the cold side. An attempt to identify and quantify the single contributions of the different transport forms involved is also presented. The diferent results gave, however, diverging conclusions and therefore the question about existence of the type of transport forms driven by the non-isothermal effects remains open. Rather surprisingly, all the materials, including the almost non-hygroscopic materials (e.g. rock wool) and very hygroscopic materials (e.g. cellulose insulation) showed the same characteristics.
U2 - 10.1016/j.buildenv.2007.01.021
DO - 10.1016/j.buildenv.2007.01.021
M3 - Journal article
SN - 0360-1323
VL - 43
SP - 811
EP - 822
JO - Building and Environment
JF - Building and Environment
IS - 5
ER -