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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">There's also been some interesting research done in California on this.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><a href="http://www.plea2009.arc.ulaval.ca/Papers/2.STRATEGIES/2.2%20Heating%20and%20Cooling/ORAL/2-2-17-PLEA2009Quebec.pdf">Here's</a> a paper published
by Pablo La Roche at Cal Poly Pomona<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><a href="http://www.plea2009.arc.ulaval.ca/Papers/2.STRATEGIES/2.2%20Heating%20and%20Cooling/ORAL/2-2-18-PLEA2009Quebec.pdf">Here's</a> another out of USC.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:9.0pt;
font-family:"Arial","sans-serif";color:gray">Vikram Sami</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">, LEED AP<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;
font-family:"Arial","sans-serif";color:gray">Sustainable Design Analyst<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;
font-family:"Arial","sans-serif";color:gray">1382 Peachtree St. NE, Atlanta, GA 30309<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;
font-family:"Arial","sans-serif";color:gray">t: 404-443-7462 f:
</span><span lang="ES" style="font-size:9.0pt;font-family:"Arial","sans-serif";
color:gray">404.892.5823 </span><span style="font-size:9.0pt;
font-family:"Arial","sans-serif";color:gray"> e: vikram.sami@perkinswill.com
</span><span style="font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://www.perkinswill.com/"><span style="font-size:9.0pt;font-family:
"Arial","sans-serif";color:gray;text-decoration:none">www.perkinswill.com</span></a></span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:3.0pt;text-autospace:none"><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">Perkins+Will.</span></b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:gray">
</span><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#ADD425">Ideas + buildings that honor the broader goals of society</span><span style="font-size:
9.0pt;font-family:"Arial","sans-serif";color:green"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
</div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Nick Caton<br>
<b>Sent:</b> Friday, June 25, 2010 10:41 AM<br>
<b>To:</b> Drury B Crawley; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Modeling a Green Roof<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Open question:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">I’ve ascribed to the “tack an R / thermal mass value onto a new layer” approach in the past… but would appreciate a more nuanced approach if it could be
done quickly enough.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">I’m curious: Does EnergyPlus or any other option/model out there account the variable shading effects of the foliage on the roof construction, as a user
might define it? I’ve speculated this element could be handled relatively simply in eQuest using a geometrically adjacent shading surface with an annual fractional schedule, but eQuest (to my experience) doesn’t have a clean approach to account for the varying
thermal mass and insulative properties of soil that varies in moisture over time…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">~Nick<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><img border="0" width="119" height="37" id="Picture_x0020_1" src="cid:image001.jpg@01CB1458.F6DF0680" alt="cid:489575314@22072009-0ABB"></span><b><span style="font-size:11.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Stylus BT","sans-serif";
color:#2D4D5E">NICK CATON, E.I.T.</span></b><b><span style="font-family:"Stylus BT","sans-serif";
color:#2D4D5E"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Calibri","sans-serif";
color:#CC9900">PROJECT ENGINEER</span><span style="font-size:7.5pt;color:#CC9900"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E">25501 west valley parkway<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E">olathe ks 66061<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E">direct 913 344.0036<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E">fax 913 345.0617<o:p></o:p></span></p>
<p class="MsoNormal"><i><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";
color:#2D4D5E">Check out our new web-site @
</span></i><span style="font-size:
11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style="font-size:10.0pt">www.smithboucher.com</span></a></span><u><span style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:blue">
</span></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Drury B Crawley<br>
<b>Sent:</b> Friday, June 25, 2010 9:25 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Modeling a Green Roof<o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">EnergyPlus has a model for green roofs built in -- based on experimental measurements and experience of researchers at Portland State University, Prof David Sailor:
<a href="http://web.cecs.pdx.edu/~sailor/">http://web.cecs.pdx.edu/~sailor/</a><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">---------- Forwarded message ----------<br>
From: <b>Jeremy Poling</b> <<a href="mailto:jpoling@epsteinglobal.com">jpoling@epsteinglobal.com</a>><br>
Date: Fri, Jun 25, 2010 at 10:04 AM<br>
Subject: Re: [Bldg-sim] Modeling a Green Roof<br>
To: <a href="mailto:Jason.Boehning@ricegardner.com">Jason.Boehning@ricegardner.com</a>,
<a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><o:p></o:p></p>
<div>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt">Penn State University (<a href="http://horticulture.psu.edu/cms/greenroofcenter/" target="_blank">http://horticulture.psu.edu/cms/greenroofcenter/</a>)
and Michigan State University (<a href="http://www.hrt.msu.edu/greenroof/" target="_blank">http://www.hrt.msu.edu/greenroof/</a>) both have significant research programs on green roofs. I would recommend looking at the results of the Penn State study on energy
transfer in Green Roofs (<a href="http://etda.libraries.psu.edu/theses/approved/WorldWideFiles/ETD-4616/Thesis_Paulo_Tabares_revised.pdf" target="_blank">http://etda.libraries.psu.edu/theses/approved/WorldWideFiles/ETD-4616/Thesis_Paulo_Tabares_revised.pdf</a>).
In general, green roofs handle energy through the insulating effects of soil, the cooling effects of evapotranspiration in the plants, and water flows within the green roof assembly. This means that a calculated R-value will be different depending on the
amount of plant material participating in evapotranspiration, the wetness of the soil, and whether the roof is intensive or extensive. A straight R-value approach is very simplified and should be used with the understanding that model results are much less
likely to be accurate. The Penn State study gives a review of published literature showing extensive green roofs have R-values between 1.8 and 4.8 while intensive green roofs have R-values between 5 and 20.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt">In general, the average R-value of soil is 0.25 per inch, so for a 12” soil depth the R-value of the soil would be R-3 excluding assumptions on soil
wetness and evapotranspiration. We typically go conservative and just model the R-value of the additional soil since you would need a TRNSYS or MatLab model to take into account the other energy benefits of a green roof.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt"> </span><o:p></o:p></p>
<div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt;color:#C75B12">JEREMY R. POLING, PE, LEED AP</span></b><span style="font-size:10.0pt"><br>
</span><span style="font-size:8.0pt;color:gray">Associate Vice President,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:8.0pt;color:gray">Senior Sustainability Analyst<br>
Strategic Services<br>
<i>Site Solutions | Operations | Sustainability</i></span><span style="font-size:10.0pt"><br>
<br>
<b><span style="color:#C75B12">EPSTEIN</span></b><br>
</span><span style="font-size:8.0pt"><br>
<b><i><span style="color:green">Epstein is a firm believer in sustainability. We ask that you please consider the environment before printing this e-mail.</span></i></b></span><o:p></o:p></p>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt">From:</span></b><span style="font-size:10.0pt">
<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Fareed Syed<br>
<b>Sent:</b> Friday, June 25, 2010 8:05 AM<br>
<b>To:</b> Jason Boehning; <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">
bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> Re: [Bldg-sim] Modeling a Green Roof</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;color:#1F497D">I heard from our director of sustainability to use R-5 for a typical green roof. It was confirmed by few senior architects.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;color:#1F497D">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;color:#1F497D">Fareed</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt;color:#1F497D"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:10.0pt">From:</span></b><span style="font-size:10.0pt">
<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Jason Boehning<br>
<b>Sent:</b> Friday, June 25, 2010 8:46 AM<br>
<b>To:</b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> [Bldg-sim] Modeling a Green Roof</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt">Howdy!
</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt">Has anyone modeled a green roof? I have a standard roof with 12 inches of soil and grass. I have been searching the web for thermal properties such
as U values, thermal absorptivity and so on. Are there any good references to find these values or does anyone have tips to model a green roof? I appreciate your help.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.0pt"> </span><o:p></o:p></p>
<p>Jason Boehning, EIT<o:p></o:p></p>
<p>Mechanical Engineer<o:p></o:p></p>
<p><b>Error! Filename not specified.</b><o:p></o:p></p>
<p>6161 Savoy, Suite 1212<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Houston, Texas 77036<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> v. 713.482.2322<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> f. 713.482.2314<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> e.
<a href="mailto:Jason.Boehning@ricegardner.com" target="_blank"><span style="color:windowtext">Jason.Boehning@ricegardner.com</span></a><o:p></o:p></p>
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