FAQ:General:HygricParametersofEcologicalInsulationMaterials - Versionsgeschichte

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2013-06-13T12:29:29Z

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Len: /* (11): Hygric Parameters of Ecological Insulation Materials */

2008-10-06T08:27:32Z

(11): Hygric Parameters of Ecological Insulation Materials

← Nächstältere Version		Version vom 6. Oktober 2008, 10:27 Uhr
Zeile 32:		Zeile 32:
	wet by rain or condensation, you will mainly be concerned with water contents in the		wet by rain or condensation, you will mainly be concerned with water contents in the
	sorption moisture region of the		sorption moisture region of the
	[[Details:~~MoistureStoragefunction~~ \| moisture storage function]], for which these		[[Details:MoistureStorageFunction \| moisture storage function]], for which these
	simplifications should be adequate.<BR>		simplifications should be adequate.<BR>
	As these materials must be prevented from becoming wetted through anyway, there		As these materials must be prevented from becoming wetted through anyway, there

Len: Die Seite wurde neu angelegt: = (11): Hygric Parameters of Ecological Insulation Materials = I want to investigate the hygric behavior of ecological insulation materials, such as flax, hemp or r...

2008-10-06T08:27:16Z

Die Seite wurde neu angelegt: = (11): Hygric Parameters of Ecological Insulation Materials = I want to investigate the hygric behavior of ecological insulation materials, such as flax, hemp or r...

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= (11): Hygric Parameters of Ecological Insulation Materials =

I want to investigate the hygric behavior of ecological insulation materials,
such as flax, hemp or reed. However, these materials consist of fibres, whereas WUFI
is mainly designed for capillary-active porous materials. What is the best approach?


The difference between fibres and porous mineral materials is in general not really
crucial for the transport equations. The fibre materials may tend to have preferred
transport directions, which would have to be allowed for by using appropriate material
data for the x and y directions in a two-dimensional calculation.


Determining the
[[Details:LiquidTransportCoefficients | liquid transport coefficients]], however,
may be difficult or even impossible if they change their consistency upon wetting
(e.g. by caking).


On the other hand: 
As long as your insulation materials don't become so wet that capillary conduction
becomes predominant, you can ignore capillary transport and only consider diffusion
transport. That is, you leave the liquid transport coefficients undefined and
only enter a
[[Details:BasicMaterialData | µ-value]]. Surface diffusion phenomena
may be allowed for by using a
[[Details:DiffusionResistanceFactorMoistureDependent | moisture-dependent
µ-value]].


Since you probably only want to assess whether or not the insulation becomes
wet by rain or condensation, you will mainly be concerned with water contents in the
sorption moisture region of the
[[Details:MoistureStoragefunction | moisture storage function]], for which these
simplifications should be adequate. 
As these materials must be prevented from becoming wetted through anyway, there
will be no need to investigate in detail the behavior of an insulation soaked
full of water.