RE: [EnergyPlus_Support] effect of moisture on thermal insulation properties

[Christian Struck <Christian.Struck@xxxxxxxxxxxxxxx>]

Dear Najad,

(...you little picky...!) Your are entirely right! 
In sentence two of my email " effect of moisture on thermal insulation
properties" I refer to thermal resistance rather than conductivity. As Najad
implies correctly, the thermal conductivity will be increased rather than
decreased.

Many thanks for your attention!

Christian

> -----Original Message-----
> From:	Najad Tuffaha [SMTP:ntuffaha@xxxxxxxxxxxxxxx]
> Sent:	29 September 2003 16:08
> To:	EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject:	RE: [EnergyPlus_Support] effect of moisture on thermal
> insulation properties
> 
> In the second sentence, did you mean to say the thermal resistance is
> reduced?
> 
> -----Original Message-----
> From: Christian Struck [mailto:Christian.Struck@xxxxxxxxxxxxxxx] 
> Sent: Monday, September 29, 2003 10:54 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [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,
> 
> Christian
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Sponsor      
> 
> <
> <http://rd.yahoo.com/M=259395.3614674.4902533.1261774/D=egroupweb/S=170500
> 73>
> 89:HM/A=1524963/R=0/SIG=12o885gmo/*
> <http://hits.411web.com/cgi-bin/autoredir?>
> camp=556&lineid=3614674&prop=egroupweb&pos=HM>       
> 
> <
> <http://us.adserver.yahoo.com/l?M=259395.3614674.4902533.1261774/D=egroupm
> ai>
> l/S=:HM/A=1524963/rand=536743135>       
> 
> To unsubscribe from this group, send an email to:
> EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> 
> The primary EnergyPlus web site is found at:
> <http://www.energyplus.gov>
> 
> The group web site is:
> <http://groups.yahoo.com/group/EnergyPlus_Support/>
> 
> Attachments are not allowed -- please post any files to the appropriate
> folder in the Files are of the Support Web Site.
> 
> 
> 
> 
> 
> 
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
> < <http://docs.yahoo.com/info/terms/>> . 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
> 
> 
> 
> Yahoo! Groups Sponsor	 
> ADVERTISEMENT
> click here
> <http://rd.yahoo.com/M=194081.3897168.5135684.1261774/D=egroupweb/S=170500
> 7389:HM/A=1732161/R=0/SIG=11p5b9ris/*http://www.ediets.com/start.cfm?code=
> 30509&media=atkins>	
>  
> <http://us.adserver.yahoo.com/l?M=194081.3897168.5135684.1261774/D=egroupm
> ail/S=:HM/A=1732161/rand=625785435>	
> 
> To unsubscribe from this group, send an email to:
> EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
> 
> The primary EnergyPlus web site is found at:
> <http://www.energyplus.gov>
> 
> The group web site is:
> <http://groups.yahoo.com/group/EnergyPlus_Support/>
> 
> Attachments are not allowed -- please post any files to the appropriate
> folder in the Files are of the Support Web Site.
> 
> 
> 
> 
> 
> 
> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service
> <http://docs.yahoo.com/info/terms/>. 

------------------------ Yahoo! Groups Sponsor ---------------------~-->
Upgrade to 128-Bit SSL Security!
http://us.click.yahoo.com/p7cEmB/s7qGAA/yigFAA/dkFolB/TM
---------------------------------------------------------------------~->

To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are not allowed -- please post any files to the appropriate folder in the Files are of the Support Web Site.




 

Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/