[Bldg-sim] effective R-value cavity insulation

Bishop, Bill wbishop at pathfinder-ea.com
Mon Jun 7 05:50:42 PDT 2010

One reference for calculating U-Factors for wood-framed, metal-framed
and masonry walls is the 2009 ASHRAE Handbook - Fundamentals, Chapter
27. There is a section on "Two-dimensional U-factor calculation", which
describes the parallel-path, isothermal-planes, zone and modified zone
methods of calculating overall heat transfer rates through wall
assemblies. Earlier versions of Fundamentals (2005, 2001 etc.) will also
have some background information.
William Bishop, EIT, BEMP, LEED(r) AP | Pathfinder Engineers &
Architects LLP
Mechanical Engineer
134 South Fitzhugh Street
Rochester, NY 14608
T: (585) 325-6004 Ext. 114
F: (585) 325-6005
wbishop at pathfinder-ea.com
P Sustainability - less is more.

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Kevin Kyte
Sent: Saturday, June 05, 2010 12:13 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] effective R-value cavity insulation
I am curious what the relationship is between cavity depth, rated
insulation, and effective insulation in framed walls.  I am referencing
the ASHRAE 90.1 doc because it is really the only one I have on this
subject.  I have charted Table A9.2B and a logarithmic trendline appears
to be a good fit for extrapolating.  If anyone in academia, industry, or
the societies has more information on this subject I would certainly be
grateful to receive a good lead.  Thank you.
Kevin Kyte, LEED (r) AP
Watts Architecture & Engineering, P.C.
95 Perry Street, Suite 300
Buffalo, NY  14203
p:  716.206.5174
f.:  716.206.5199
e:   kkyte at watts-ae.com
http://www.watts-ae.com <http://www.watts-ae.com/> 
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