[GSBN] UK SB Thermal performance numbers

[Pete Walker]

Hi
 
The thermal test was undertaken in 2008 (reported 2009) in BBA labs in the
UK. The panel was 490 mm thick and 3.4 m high x 3.5 m wide with two layers
of approximately 30 mm thick hydraulic lime render on both faces. the bales
were laid flat (as standard) and the bale density was approximately 130
kg/m3 after compression inside a timber frame. the test was a steady state
guarded hot box arrangement undertaken in accordance with BS EN ISO
8990:1998. I will need to check with partners who sponsored the work before
releasing the report in full, although I don't expect it will be a problem.
 
regards
 
Pete

  _____  

From: GSBN-bounces at greenbuilder.com [mailto:GSBN-bounces at greenbuilder.com]
On Behalf Of Kelly Lerner
Sent: 30 April 2010 23:16
To: ArchiLogic at yahoo.ca; (private, with public archives) Global Straw
Building Network
Subject: Re: [GSBN] UK SB Thermal performance numbers


Hey Rob, 
I took off 1" stucco on each side (at R 0.2/inch) on both sides and came up
with R 1.75/inch for the bales themselves. Still better than the R 1.25/inch
that is listed in the 2007 PHPP. 

Kelly

On Apr 30, 2010, at 10:46 AM, RT wrote:


On Fri, 30 Apr 2010 09:19:14 +0100
"Pete Walker" <abspw at bath.ac.uk> wrote:



We have completed a certified thermal conductivity test on a rendered 3.5 x
3.5 m x 0.49 m thick straw bale panel. The U-value (thermal transmittance


rather than resistance) was 0.19 W/m2k. An R value of 5.3 m2k/W.




For the benefit of our non-SIU Murrican listmembers, the above translates to
a thermal resistivity of R-1.9
per inch (in imperial units of ft^2*hr*degF/Btu*inch), which is a bit more
flattering for SB than the value that the Californians have promoted as a
result of their "certified" testing.

So Peter, I'm wondering if you could share with us, a bit about the testing
set-up and procedure that was used in the UK testing program (or provide a
link to a site that describes it) ?

-- 
=== * ===
Rob Tom
Kanata, Ontario, Canada
< A r c h i L o g i c  at  Y a h o o  dot  c a >
(manually winnow the chaff from my edress if you hit "reply"
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Kelly Lerner, Architect
One World Design Architecture
509-838-8812
www.one-world-design.com

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