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<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">Christopher –<o:p></o:p></span></a></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">The ASHRAE SSPC 90.1 discussed this in preparation of addendum ac 4<sup>th</sup> public review to 90.1-2010. The handbook values for “air” are based on the somewhat
subjective description of an air space where “air movement is minimized”. Minimized of course means different things to different people, and the description of the test procedure was a ‘sealed’ box with sheet metal and felt (the report we think was from
like 1950). In general, the final discussions that resolved all the parties was (there were also modification to the allowances for assumptions of reflective barriers). There is a request for research proposal on this topic to better understand the effect
of movement and effectiveness of radiant barriers. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">However, in response to your request of the effectiveness of the air space in a cavity exposed to exterior conditions (wind, temperature, pressure differentials)
it was pretty clear the handbook values would not apply as there is just too much air movement to create a stable mass of air. (note you could apply the air films listed for a semi-exterior space in A9.4.1)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">The final text of ac 4<sup>th</sup> PRD: (the table did not change and you will note the current table in 90.1 does not exactly match the handbook as the committee
simplified the table with only up, down, and side to side air spaces and made then all Delta T neutral)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">A9.4.2 Airspaces. The R-value for airspaces shall be taken from Table A9.4A based on the effective emittance of the surfaces facing the airspace from Table A9.4B
provided the following criteria are satisfied: <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">a) The airspace shall be an enclosed and unventilated cavity designed to minimize airflow into and out of the enclosed air space. Airflow shall be deemed minimized
when the enclosed airspace is located on the interior of the continuous air barrier and bounded on all sides by building components.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">b) Reflective insulation as defined in ASTM C1224, where used, shall be fitted closely around all non-heat producing components and taped or otherwise sealed to
eliminate gaps or voids through which air, dust, or water vapor has the potential to pass.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">c) Non-parallel spaces shall use the average distance to determine the thickness of the airspace.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">d) Airspaces less than 0.5 in. (13 mm) depth thickness shall have no R-value.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">e) The R-value for 3.5 in. (89 mm) airspaces shall be used for airspaces of that thickness or greater provided that that airspace does not exceed 12 in. (300 mm)
between the surfaces at any point.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">
<br>
<b>Leonard Sciarra, AIA, ASHRAE, LEED ap+ </b><br>
Senior Associate <br>
+1 312.577.6580 Direct <br>
+1 312.456.0123 Main <br>
+1 847.345.5619 Mobile <br>
<br>
</span><b><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:#EE3224">Gensler
</span></b><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"><br>
11 East Madison Street<br>
Suite 300 <br>
Chicago, Illinois 60602 <br>
USA </span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Bldg-sim [mailto:bldg-sim-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Keith Swartz<br>
<b>Sent:</b> Friday, March 04, 2016 3:16 PM<br>
<b>To:</b> Jones, Christopher <Christopher.r.Jones@wspgroup.com>; bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Vented cavity behind brick or precast panels and effective R-value<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Christopher,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">The ASHRAE Handbook has a section about thermal resistance of air spaces. See the 2013 Fundamentals Handbook starting on p. 26.12. Is that what you are looking for?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Keith Swartz, PE
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:gray">|
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Senior Energy Engineer<o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:110%"><b><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:black">Seventhwave</span></b><b><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:gray"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="line-height:110%"><span style="font-size:10.0pt;line-height:110%;font-family:"Arial",sans-serif;color:black">608.210.7123 seventhwave.org<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Jones, Christopher [<a href="mailto:Christopher.r.Jones@wspgroup.com">mailto:Christopher.r.Jones@wspgroup.com</a>]
<br>
<b>Sent:</b> Friday, March 04, 2016 12:52 PM<br>
<b>To:</b> <a href="mailto:bldg-sim@lists.onebuilding.org">bldg-sim@lists.onebuilding.org</a><br>
<b>Subject:</b> [Bldg-sim] Vented cavity behind brick or precast panels and effective R-value<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">Is anyone aware of any analyses of the effective insulation properties of brick or precast veneer with a vented air space? I assume the air in that cavity is moving
slowly but it isn’t completely still therefore you can’t include all of the insulative properties of those two layers on the outside of a wall?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",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"><img border="0" width="108" height="43" id="Picture_x0020_2" src="cid:image001.png@01D17678.3C22ED10" alt="cid:image003.png@01D09C46.E75BA0D0"></span><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1C467A"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1C467A">Christopher Jones,</span></b><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">
</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">P.Eng.<i>
<br>
</i></span><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">Senior Engineer<b><o:p></o:p></b></span></p>
<p class="MsoNormal"><b><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">WSP Canada Inc.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">2300 Yonge Street, Suite 2300<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">Toronto, ON M4P 1E4</span><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#595959"><br>
</span><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">T +1 416-644-4226<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">F +1 416-487-9766<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D">C +1 416-697-0056<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"><a href="http://www.wspgroup.com/">www.wspgroup.com</a>
</span><i><span lang="EN-CA" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#565656"><o:p></o:p></span></i></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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