<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">I stand guilty of digital muddling - thanks for noticing.<div><br></div><div>cheers</div><div> <br><div> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div>Graeme</div><div>Graeme North Architects</div><div>49 Matthew Road</div><div>RD1</div><div>Warkworth</div><div>tel/fax +64 (0)9 4259305</div><div> </div><div><a href="mailto:graeme@ecodesign.co.nz">graeme@ecodesign.co.nz</a></div><div>www.ecodesign.co.nz</div><br class="Apple-interchange-newline"></span> </div><br><div><div>On 17/06/2009, at 3:55 AM, Derek Roff wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Hi, André,</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">In my edition of Bruce's book, on page 185, Footnote A, the general conversion factor is given as 5.678, for converting between metric and "Murrican" U-values.<span class="Apple-converted-space"> </span>Inversely, the conversion factor for R-values is given as 0.1761.<span class="Apple-converted-space"> </span>(Since 5.678 and 0.1761 are inverses, either of these numbers is sufficient for converting both U-values and R-values in both directions, if you set up the equation properly).<span class="Apple-converted-space"> </span>Bruce's conversion factor is in agreement (of course) with several web sources, including Wikipedia on R-value: <<a href="http://en.wikipedia.org/wiki/R-value_(insulation)">http://en.wikipedia.org/wiki/R-value_(insulation)</a>> (Click on item 1 "Units") in the pages Contents.)</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">On page 187, Bruce's book gives an R-value of 1.45 per inch for strawbale.<span class="Apple-converted-space"> </span>It goes on to say that the thermal resistivity was found to be higher for bales stacked on edge than flat.<span class="Apple-converted-space"> </span>It doesn't say which orientation the 1.45 figure refers to.<span class="Apple-converted-space"> </span>Using the R-value conversion constant of 0.1761 from page 185, I set up the equation like this:</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">(Murrican R-value) 1.45/inch x 0.1761 (Murrican R-value to metric conversion factor) x 39.37 (inches to meters) = 10.05 (metric R-value per meter)</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">1.45 x 0.1761 x 39.37 = 10.05</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">That seems to confirm Rob Tom's calculation.<span class="Apple-converted-space"> </span>Not that I ever doubted it.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Derek</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">PS.<span class="Apple-converted-space"> </span>I wonder if Graeme North might have transposed two digits in his message.<span class="Apple-converted-space"> </span>5.678 rounds nicely to 5.68, which is in agreement with all the sources that I looked at.<span class="Apple-converted-space"> </span>"5.86" looks like it might be the same number with the last two digits transposed.</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">--On Monday, June 15, 2009 8:22 PM +0200 <a href="mailto:contact@lamaisonenpaille.com">contact@lamaisonenpaille.com</a> wrote:</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div> <blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Hello,</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">For the purpose of publishing Bruce Kings book "Design of SB</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Buildings" in french I would appreciate someone from this list</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">confirming Rob Tom's conversion below (for page 187):</div> <blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">A thermal resistivity of 1.45 ft2*hr*degF/Btu*inch (Murrican)</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">converts to 10.05 m2*degC/W*m (SIU).</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">The thermal conductivity, or lambda value = 1 / thermal resistivity</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">= 1 / 10.05 m2*degC/W*m</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">= 0.0994 W/mK lambda (?)</div> </blockquote><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Thanks,</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">André de Bouter</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">La Maison en Paille</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">www.lamaisonenpaille.com</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">GSBN mailing list</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="mailto:GSBN@greenbuilder.com">GSBN@greenbuilder.com</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="http://greenbuilder.com/mailman/listinfo/GSBN">http://greenbuilder.com/mailman/listinfo/GSBN</a></div> </blockquote><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Derek Roff</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Language Learning Center</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Ortega Hall 129, MSC03-2100</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">University of New Mexico</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Albuquerque, NM 87131-0001</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">505/277-7368, fax 505/277-3885</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Internet: <a href="mailto:derek@unm.edu">derek@unm.edu</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: 14px; "><br></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">GSBN mailing list</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="mailto:GSBN@greenbuilder.com">GSBN@greenbuilder.com</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="http://greenbuilder.com/mailman/listinfo/GSBN">http://greenbuilder.com/mailman/listinfo/GSBN</a></div> </blockquote></div><br></div></body></html>