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RE: GSBN:FW: 3-layer passive insulation?

<x-charset windows-1250>Sounds interesting.  Also sounds like a lot of work.  I wasn't aware that
convection within the bales was so problematic.  Then again, we have very
tight, dense bales, and it would seem that breaking them into flakes would
lower the density more than paper would help convection.

Sorry I can't make it to Czechia this weekend to help out. 

John "Flakey" Swearingen

John Swearingen
design and construction

-----Original Message-----
From: GSBN [<a  target="_blank" href="mailto:GSBN@...";>mailto:GSBN@...] On Behalf Of Joyce Coppinger
Sent: Thursday, July 20, 2006 10:14 AM
Subject: GSBN:FW: 3-layer passive insulation?

Has anyone heard of or used the three-layer passive insulation method? Any
comments about it's effectiveness?

> From: Jan Hollan jhollan@...
> Reply-To: European strawbale building discussions 
> strawbale@...
> Date: Thu, 20 Jul 2006 00:19:20 +0200 (CEST)
> To: European strawbale building discussions 
> strawbale@...
> Subject: [Strawbale] Volunteers for 3-layer passive insulation?
> We will insulate one wall of the building (author: Georg W Reinberg) 
> being currently constructed there. At least 3-ply straw sandwich (40 
> cm thick) will be used.  Well separable layers taken from jumbo bales 
> will be employed, about 7 cm thick (taken as pairs in this case). At 
> wall, they will be separated by paper, at least each 14 cm of 
> thickness. The purpose of dividing straw by paper is to suppress heat 
> transport by convection to almost negligible values (convection takes 
> place just inside the individual chambers of 1/3 thickness, at 1/3 
> temperature drop and less then 1/3 flow speed, so the total convection 
> heat transport is about 1/10 of the case with just a single undivided 
> straw layer). Such suppression is a prerequisite to achieve 
> passive-house U values of about 0.1 W/m2K.

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