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<p class="MsoNormal">Hi all - we’re encountering unexpected heating results and envelope sensitivity in our model of a typical Core & Shell office building in Montreal, Canada (ASHRAE Climate Zone 6A).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The building is modeled as fan powered underfloor air distribution from compartmental units fed by makeup air units on the roof. The heating plant has a modulating boiler, HRV, and the envelope has 53% WWR. We’re using EE4 (DOE2.1E) vs
the MNECB code. The proposed building has a worse envelope than the auto-generated baseline case.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Out two questions:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>We think our <b>heating savings are lower than expected</b> (only 10% savings) while are cooling/fans/pumps savings are as expected (60%-80% savings) vs the MNECB baseline case.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>We don’t understand why <b>reducing the envelope performance has a greater than expected impact on our overall savings</b> (15% worse). Given our experience with similar eQuest models in similar climate zones, we would expect similar
envelope performance reduction to have only an overall performance impact of around 3%.<o:p></o:p></p>
<p class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoNormal">To give a reasonable code comparison, LEED NC 2009 give EAc1 points for between 12% and 48% savings vs ASHRAE 90.1-2007 and 25% to 56% savings vs the MNECB.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I would appreciate your insight as to why the model may be performing as such. I can provide more information if it would help.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US" style="mso-fareast-language:EN-CA">Thanks kindly,</span><span lang="EN-US" style="mso-fareast-language:EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-family:"Franklin Gothic Book","sans-serif";color:#1D477B;mso-fareast-language:EN-CA"><o:p> </o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-family:"Franklin Gothic Book","sans-serif";color:#1D477B;mso-fareast-language:EN-CA">Christopher Zabaneh</span></b><span style="font-size:8.0pt;font-family:"Franklin Gothic Book","sans-serif";mso-fareast-language:EN-CA">,
P.E., LEED AP BD+C, CEPE</span><b><span style="font-family:"Franklin Gothic Book","sans-serif";color:#1D477B;mso-fareast-language:EN-CA"><o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Franklin Gothic Book","sans-serif";mso-fareast-language:EN-CA">Halsall Associates
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