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[EnergyPlus_Support] effect of moisture on thermal insulation properties

Dear E+ user,

I was asked to assess how the thermal properties of wet natural fibres
compare to wet artificial fibres(rockwool).
One claims natural fibres absorb the moisture, the thermal conductivity is
reduced not as bad as for artificial fibres, which do not have the
capability to absorb moisture at all. 

I would have used the MTF algorithm in  E+ to conduct the assessment. But...
since we have only one set of material properties available (vapour
diffusivity, prorosity, thermal gradient, isothermal moisture capacity)  I
am not sure how to represent different degrees of stored moisture. 

Another thought was to change the external humidity and recalculate the
u-value based on the resulting heat transfer through the wall of concern.
....still it would not take into account moisture stored within the fabric
since I assume the materials given represent the material dry.

I would seriously appreciate every single comment on my request! So please
do not hesitate to hit the keyboard!

Best Regards,


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