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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Probably not a bug! One possible explanation is that sometimes it is cooler outside your apartment building than inside even when there is a cooling load – during these times the infiltration is acting like an air-side economizer to reduce the energy needed for cooling.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">This effect should be offset by large gains during the coldest weather for heating energy, and may be offset (at least partially) by gains at the warmer times of the year for reduced cooling energy.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">For Pennsylvania and New Jersey there should be a noticeable number of hours in that middle range though, so I don’t think your results are unexpected.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">One solution might be for the energy model to account for the times the user would turn off the A/C during that time and use their windows through scheduling of the availability for the cooling system. You’ll have to come up with some reasonable pattern based on your expectation for the occupants. (Unless you don’t think they will open the windows, then the results stand as-is.)</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">David</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></p><p class="MsoNormal"><u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black"> </span></u><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, BEAP, HBDP</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"></span></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#244061">Grumman/Butkus Associates</span></b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </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""> <a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>steve clark<br>
<b>Sent:</b> Tuesday, November 22, 2011 6:42 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] negative energy savings for infiltration reduction?</span></p>
</div><p class="MsoNormal"> </p><p class="MsoNormal" style="margin-bottom:12.0pt">When modeling infiltration (ACH) reduction in equest, I often get smal negative electricity (cooling) savings and large positive heating savings. This can occur even when air sealing is accompanied by insulation( spray foam) for multifamily buildings in NJ and PA.<br>
<br>Do other people see this? IS there any explanation for this? or is a bug? <br clear="all"><br>-- <br>Steve Clark<br><br></p></div></body></html>