<html><head></head><body><div class="ydp7fed10c0yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><div dir="ltr" data-setdir="false">Hi Melanie:</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I thought everyone would like to know that in addition to helping resolve my convergence issues, by putting in cooling and heating design days my project simulates much faster.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Before, the simulation meter would go up to 185% before it was complete, and with the CDD and HDD defined, the simulation completes at 105%, which takes about half the time.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Thank you,<br></div><div><br></div><div class="ydp7fed10c0signature">Paul Diglio<br>87 Fairmont Avenue <br>New Haven, CT 06513 <br><br>203-415-0082</div></div>
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On Wednesday, December 11, 2019, 1:43:45 PM EST, Melanie Stachowiak <mgstachowiak@meengineering.com> wrote:
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<p class="ydpfd88a725yiv8917370347MsoNormal"><span style="font-size:11.0pt;">Paul,
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<p class="ydpfd88a725yiv8917370347MsoNormal"><span style="font-size:11.0pt;">Go to project & Site and set up design degree days if they aren't already in there (one for cooling, one for heating). If you've already created them, just adjust
the number of degree days. You can also isolate to a single hour if you wish instead of having a high or low. Looks like it was my cooling design degree day that was causing the problem. I still have my heating degree day set up for seven days. This was set
up for Buffalo NY (ASHRAE climate 5A), so your values might be different depending on your location. </span></p>
<p class="ydpfd88a725yiv8917370347MsoNormal"><span style="font-size:11.0pt;">See screen clips below.</span></p>
<p class="ydpfd88a725yiv8917370347MsoNormal"><span style="font-size:11.0pt;">~Mel
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<p class="ydpfd88a725yiv8917370347MsoNormal"><img id="ydpfd88a725yiv8917370347Picture_x0020_3" style="width: 497px; max-width: 497px;" src="cid:O3JQ9CCQsjrFdWmHQLdq" data-inlineimagemanipulating="true"><span style="font-size:11.0pt;"> </span><img id="ydpfd88a725yiv8917370347Picture_x0020_4" style="width: 461px; max-width: 461px;" src="cid:hioh0RMYxoY0fzCtw1op" data-inlineimagemanipulating="true"><span style="font-size:11.0pt;"> </span><img id="ydpfd88a725yiv8917370347_x0000_i1027" style="width: 468px; max-width: 468px;" src="cid:7SYk4ZgtfVY7gFBvYG7Y" data-inlineimagemanipulating="true"><span style="font-size:11.0pt;"></span></p>
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<p class="ydpfd88a725yiv8917370347MsoNormal"><b><span style="font-size:11.5pt;">Melanie G. Stachowiak, P.E., LEED AP BD+C, CMVP
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</span><i><span style="font-size:10.0pt;">Project Manager, Sustainability/Commissioning Services Group
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<b>M/E Engineering, P.C.</b> <br clear="none">
Suite 320, 60 Lakefront Boulevard<br clear="none">
Buffalo, NY 14202<br clear="none">
716.845.5092 x1207 | C: 716.830.7038 <br clear="none">
<a shape="rect" href="mailto:mgstachowiak@meengineering.com" rel="nofollow" target="_blank"><span style="color:#008996;">mgstachowiak@meengineering.com
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<a shape="rect" href="http://www.meengineering.com/" rel="nofollow" target="_blank"><span style="color:#008996;">www.meengineering.com
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<p class="ydpfd88a725yiv8917370347MsoNormal"><b><span style="font-size:11.0pt;">From:</span></b><span style="font-size:11.0pt;"> Paul Diglio <paul.diglio@sbcglobal.net>
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<b>Sent:</b> Wednesday, December 11, 2019 1:09 PM<br clear="none">
<b>To:</b> Melanie Stachowiak <mgstachowiak@meengineering.com><br clear="none">
<b>Subject:</b> Re: [Equest-users] UA Convergence Error</span></p>
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<p class="ydpfd88a725yiv8917370347MsoNormal"><span>Hi Melanie:</span></p>
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<p class="ydpfd88a725yiv8917370347MsoNormal"><span>I appreciate the response. How do you set the design degree days to a single day?</span></p>
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<p class="ydpfd88a725yiv8917370347MsoNormal"><span>Thank you,</span></p>
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<p class="ydpfd88a725yiv8917370347MsoNormal"><span> </span></p>
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<p class="ydpfd88a725yiv8917370347MsoNormal"><span>Paul Diglio<br clear="none">
87 Fairmont Avenue <br clear="none">
New Haven, CT 06513 <br clear="none">
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203-415-0082</span></p>
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<p class="ydpfd88a725yiv8917370347MsoNormal"><span style="font-size:10.0pt;">On Wednesday, December 11, 2019, 11:05:55 AM EST, Melanie Stachowiak <<a shape="rect" href="mailto:mgstachowiak@meengineering.com" rel="nofollow" target="_blank">mgstachowiak@meengineering.com</a>> wrote:
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<p class="ydpfd88a725yiv8917370347MsoNormal"><span style="font-size:10.0pt;">Hi Paul,
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<p class="ydpfd88a725yiv8917370347ydpad64aecfyiv3106505737msonormal"><span style="font-size:11.0pt;">I had the same problem recently.
</span><span style="font-size:10.0pt;"></span></p>
<p class="ydpfd88a725yiv8917370347ydpad64aecfyiv3106505737msonormal"><span style="font-size:11.0pt;">The way I cleared it was playing with the design degree days - setting them to a single day.
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<p class="ydpfd88a725yiv8917370347ydpad64aecfyiv3106505737msonormal"><span style="font-size:11.0pt;">I'm still not clear why eQuest has this issue, identifying it as a heat exchanger convergence issue when it's clearly an airside system
error. </span><span style="font-size:10.0pt;"></span></p>
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<p class="ydpfd88a725yiv8917370347ydpad64aecfyiv3106505737msonormal"><span style="font-size:11.0pt;">We seem to be getting a lot of errors related to the design degree day choice, and the choice of the day/hour/duration seems to alter
the results of the model which is really unsettling. We've had many internal discussions about if we should be using climate data for the design degree day or building peak. Still undecided.
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<p class="ydpfd88a725yiv8917370347ydpad64aecfyiv3106505737msonormal"><span style="font-size:11.0pt;"> </span><span style="font-size:10.0pt;"></span></p>
<p class="ydpfd88a725yiv8917370347ydpad64aecfyiv3106505737msonormal"><span style="font-size:11.0pt;">I know this doesn't help explain why you're getting the UA convergence error, but at least it should help clear it.</span><span style="font-size:10.0pt;"></span></p>
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<p class="ydpfd88a725yiv8917370347ydpad64aecfyiv3106505737msonormal"><span style="font-size:11.0pt;">~Mel
</span><span style="font-size:10.0pt;"></span></p>
<p class="ydpfd88a725yiv8917370347ydpad64aecfyiv3106505737msonormal"><span style="font-size:11.0pt;"> </span><span style="font-size:10.0pt;"></span></p>
<p class="ydpfd88a725yiv8917370347ydpad64aecfyiv3106505737msonormal"><b><span style="font-size:11.5pt;">Melanie G. Stachowiak, P.E., LEED AP BD+C, CMVP
</span></b><span style="font-size:9.0pt;"><br clear="none">
</span><i><span style="font-size:10.0pt;">Project Manager, Sustainability/Commissioning Services Group
</span></i><span style="font-size:9.0pt;"><br clear="none">
<br clear="none">
<b>M/E Engineering, P.C.</b> <br clear="none">
Suite 320, 60 Lakefront Boulevard<br clear="none">
Buffalo, NY 14202<br clear="none">
716.845.5092 x1207 | C: 716.830.7038 <br clear="none">
<a shape="rect" href="mailto:mgstachowiak@meengineering.com" rel="nofollow" target="_blank"><span style="color:#008996;">mgstachowiak@meengineering.com
</span></a><br clear="none">
<a shape="rect" href="http://www.meengineering.com/" rel="nofollow" target="_blank"><span style="color:#008996;">www.meengineering.com
</span></a></span><span style="font-size:10.0pt;"></span></p></div>
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