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Impact of the moisture buffering effect of wooden materials on energy demand and comfort conditions

 
: Winkler, Matthias; Nore, Kristine; Antretter, Florian

Arfvidsson, Jesper (Ed.) ; Univ. Lund:
NSB 2014, 10th Nordic Symposium on Building Physics : 15-19 June 2014, Lund, Sweden; Full Papers
Lund, 2014
ISBN: 978-91-88722-53-9
S.483-491
Nordic Symposium on Building Physics (NSB) <10, 2014, Lund>
Englisch
Konferenzbeitrag
Fraunhofer IBP ()

Abstract
This paper assesses the effects of moisture buffering and related latent heat exchange in wooden surfaces on energy demand and comfort conditions in rooms. A parametric study on basis of an exemplary room varies surface material properties and areas, moisture production cycles, climatic conditions and air change rates for the zone. The study was conducted with the help of hygrothermal whole building simulation, which allows modelling all physical effects related to moisture buffering and latent heat exchange that occur in the surfaces that enclose spaces. Both long and short term simulations were performed, with time steps of one hour or one minute, to assess the associated influences on indoor climate and energy demand. The study shows a distinct influence on indoor relative humidity. Moisture buffering effects of wooden materials reduce the fluctuation of relative humidity and lead to a more stable indoor climate. Because of that energy demand for humidification and dehumidification can be reduced clearly. Long term simulations show little or no impact for mean indoor and surface temperatures and herby connected energy demand for heating and cooling. Simulations with high temporal-resolution show temporary increase of room and surface temperatures coming with the application of wooden materials as long as moisture loads are available inside the room.

: http://publica.fraunhofer.de/dokumente/N-323922.html