[BLDG-SIM] help for simulation of strawbale house

[Jon McHugh]

-----Original Message-----
From: Nehemiah Stone 
Sent: Thursday, May 26, 2005 2:57 PM
To: Jon McHugh; bldg-sim at gard.com; postman at gard.com
Subject: RE: [BLDG-SIM] help for simulation of strawbale house

 The tests cited below were for BALES, not bale wall construction.  The
most reliable tests on bale wall construction was done at ORNL circa
1997.  It was written up in a report to the California Energy Commission
and in a paper delivered at the 1998 ACEEE Summer Study on Buildings.
Authors: Nehemiah Stone and Tav Commins.
The R-value is about R-33.  The thermal lag is about 12-15 hours for a
standard (22") bale wall.
Hope this helps.

Nehemiah Stone
Senior Project Manager
HESCHONG MAHONE GROUP
11626 Fair Oaks Blvd., #302
Fair Oaks, CA  95628
(916) 962-7001
www.h-m-g.com


-----Original Message-----
From: Jon McHugh
Sent: Thursday, May 26, 2005 2:51 PM
To: Nehemiah Stone
Subject: FW: [BLDG-SIM] help for simulation of strawbale house

More bale head stuff.  Boy there really has been a flurry of activity on
straw bales this week on bld sim listserve! 

-----Original Message-----
From: postman at gard.com [mailto:postman at gard.com] On Behalf Of Justin
Harrell
Sent: Thursday, May 26, 2005 1:12 PM
To: BLDG-SIM at GARD.COM
Cc: BLDG-SIM at gard.com
Subject: [BLDG-SIM] help for simulation of strawbale house

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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