[BLDG-SIM] help for simulation of strawbale house

[Justin Harrell]

Nesen,
Here is a link to some master's thesis work that found an insulation value for
wheat straw as high as R-52 (hr-sqft-F/BTU) for a 16.5 in thick bale,
(R-3.15/in).  However, the R value was found to decrease with increasing delta T
and also depends on straw direction relative to the temperature gradient.  As
far as I can tell, the dependence of R value on moisture content was not tested.
 The bales used had about 8.2-8.4% moisture content and an average density of
8.33 lbs/cuft(wheat) to 7.72 lbs/cuft(rice).  However, the moisture content of
installed walls will vary depending on climate and season and the density will
depend on how the straw was baled and whether the walls are load bearing or not.
 Usually, straw bales are covered with stucco, so this should determine the
absorptive and emissive properties of the wall construction.  I hope this helps.

http://solstice.crest.org/efficiency/straw_insulation/straw_insul.html

Justin Harrell


---------Included Message----------
 | Date: 25-May-2005 06:52:57 -0500
 | From: "Nesen Surmeli" <n_surmeli at yahoo.com>
 | Reply-To: <n_surmeli at yahoo.com>
 | To: <BLDG-SIM at gard.com>
 | Subject: [BLDG-SIM] help for simulation of strawbale house
 | 
 | Dear All,
 |  
 | I am working on a project for thermal performance analysis of a strawbale
house with ECOTECT in Faculty of Architecture, Middle East Technical University.
The study is a part of a research project for building an eco-center working on
several types pf construction techniques with local and prefabricated elements.
Unfortunately the programe does not have the material properties ofr strawbale
in its material library. I would be glad for any help regarding to thermal
properties of strawbale including u-value, admittance, solar absorption, thermal
degreement, and thermal lag. Any comments or advices for helpful resources would
be welcome...
 |  
 | Thanks in advance 
 | Nesen Surmeli...
 |  
 | 
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