[GSBN] Decrement factor of SB walls

[Van Krieken]

Hi

The best source of information about this issue (and many others concerning
insulation, thermal mass, etc) it is the book writen by Jean-Pierre Oliva
and Samuel Courgey ( L'Isolation Thermique Ecologique).

Citing their book, page 175, concerning a wall with wood structure and
straw bales with medium density (80 to 110 Kg/m3, strawbale section
34x46cm. Vented façade in exterior, and interior with clay render.


Thermal loss U (W/m2K) / R (m2K/W) .................................. 0,13
/ 7,76
Losses due to thermal
bridges............................................... 4%
Daily indoor heat capacity (kWh/m2K)................................ 15
(strong)
Sequential indoor heat capacity (kWh/m2K).......................25 (medium)
Phase shift (hour) / mitigation of the heat flux (%)............... 16h /
13%

Unfortunately, this book is only in English. Jean-Pierre Oliva, is one of
the best known french bio climatic architects, and since many years a great
enthusiast of straw bale building. His books (also La Architectire
Bioclimatique) can be found at Amazon.


All the best

Jorge VK
Portugal


On Mon, Nov 28, 2011 at 10:55 PM, <strawnet at aol.com> wrote:

>  Ken, Polly Cooper and Jennifer Rennick's chapter that John mention's in
> that Wiley book - Alternative Construction: Contemporary Natural Building
> Methods, has a lot of information on this though they don't use the term
> "decrement." They talk about this issue with straw and other types of wall
> systems and go into considerable detail. I would get in touch with them and
> see what they have to say.
>
> David Eisenberg
>
>
>  -----Original Message-----
> From: Laura Bartels <laura at greenweaverinc.com>
> To: Global Straw Building Network <GSBN at sustainablesources.com>
> Sent: Mon, Nov 28, 2011 3:40 pm
> Subject: Re: [GSBN] Decrement factor of SB walls
>
>  Hi Martin,
> Without going back to the details, I could be mistaken, but it seems that
> a study by Ken Haggard a while back addressed this or similar properties. I
> found reference in a GSBN email from '07- see below. Is this the same
> metric?
>
>  Laura
>
>
>  John,
>
> There is that chapter from Ken Haggard and Polly Cooper on Natural
> Conditioning in the book Alternative Construction where they look at
> this. I was looking at it just recently for some curriculum development.
>
> Laura
>
> John Swearingen wrote:
>
> Very interesting paper, and well written.  Some time ago I remember hearing
>
> someone toss out some similar observations about thermal storage, that on a
>
> diurnal cycle, plaster is activated to a depth of about 2-3 inches
>
> (5cm -7.5cm).  I have always figured that the exceptional thermal
>
> performance of
>
> straw bale buildings is not due solely to the high R-value.  The broad
>
> thermal mass of the plastered walls, readily available to indoor air for
>
> heat exchange, modulates temperatures like my pink Cadillac modulates bumps
>
> in the road.
>
>
> Does anyone know of research and measurements of short and medium thermal
>
> storage in walls?
>
>
> John "Diurnally Yours" Swearingen
>
>
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>
>  Laura Bartels
> GreenWeaver Inc.
> 520 S. Third St., Suite 5
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> www.greenweaverinc.com
>
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