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<p class="MsoNormal">Fascinating! (I’ve got deadlines today so naturally something catches my eye in the mailing list…)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">On first pass through that article, it seems to me that the ASHRAE 90.1 committee dropped the ball with respect to considering performance rating energy simulation inputs.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There appears to be no immediately clear path for an energy simulator to get from a prescribed minimum ISMRE / ISCOP to a steady state EER or COP inputs you could apply to typical/library performance curves. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It might be possible to iteratively worsen the inputs of a standard DX unit accomplishing dehumidification and hot gas reheat to generate 70F air, then calculate its resulting “virtual lab” ISMRE / ISCOP rating using custom hourly reports
for capacity/input at the stated testing conditions from the new standard 920 (tables in the linked paper summarize)… tweaking the weather/loading profiles may be necessary to replicate each testing condition – not a small venture. You could alternatively
assemble all of the associated library curves and make a virtual benchmarking spreadsheet to model in parallel what doe2 would output for power in and capacity given [evaporator DB, evaporator WB, condenser DB, PLR], which would make it easier to punch in
the various PLR and temperature conditions as variables. You could then run a solver function on the steady state EIR you’ll enter for the unit to arrive at the exact/target prescribed rating. You could then post here and potentially sell copies of your work
for 5 bucks a pop until 90.1 catches up… I’d pay that readily if a conundrum like this were in front of me today.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><img width="604" height="225" style="width:6.2916in;height:2.3437in" id="Picture_x0020_2" src="cid:image003.png@01D4EB99.44B95FB0"><o:p></o:p></p>
<p class="MsoNormal">Seems to me the ASHRAE Standard 90.1 committee has a little more homework to address this topic fully. I suggest either:<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">Come up with some concurrent steady-state performance criteria and a set of performance curves to fully describe the systems corresponding to the listed ISMRE / ISCOP ratings (rather
than dump this legwork on all of the end-users, the majority of which will struggle and probably get the math wrong), or
<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">Come up with a broad-stroke “derate” of the listed baseline efficiency for a normal DX system performing DOAS duties to fairly account for extra energies resulting from subcooling/hot
gas reheat<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Then again maybe I’m missing something… does this proposal make sense to anyone?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><i>OK I better get back to work!<o:p></o:p></i></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">~Nick<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#3A7A46">Nick Caton, P.E., BEMP</span></b><span style="color:#3A7A46"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Senior Energy Engineer</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Regional Energy Engineering Manager<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy and Sustainability Services</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#1F497D"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#626469"> Energy Performance Contracting
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<p class="MsoNormal"><b>From:</b> Equest-users <equest-users-bounces@lists.onebuilding.org>
<b>On Behalf Of </b>Lee Shaver via Equest-users<br>
<b>Sent:</b> Friday, April 05, 2019 9:08 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Modeling ISMRE<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p><span style="color:red">[External email: Use caution with links and attachments]</span><o:p></o:p></p>
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<p> <o:p></o:p></p>
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<p>Hi all,<o:p></o:p></p>
<p>ASHRAE 90.1-2013 addendum cd adds tables 6.8.1-14 and -15 which include an ISMRE requirement for "electrically operated DX-DOAS units, single package and remote condenser."
<o:p></o:p></p>
<p>ISMRE stands for <strong><span style="font-family:"Calibri",sans-serif">"Integrated Seasonal Moisture Removal Efficiency"</span></strong> and is measured in pounds of water removed per kWh of electrical energy consumed (lb/kWh).<o:p></o:p></p>
<p>TRANE has a <a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.trane.com%2Fcontent%2Fdam%2FTrane%2FCommercial%2Fglobal%2Fproducts-systems%2Feducation-training%2Fengineers-newsletters%2Fstandards-codes%2FADM-APN060-EN_110116.pdf&data=02%7C01%7CNicholas.Caton%40se.com%7Cb5c3aa2118f64e4f25fc08d6b9d0267e%7C6e51e1adc54b4b39b5980ffe9ae68fef%7C0%7C0%7C636900700993138894&sdata=hT9LSLOD1J9MJEZ%2F6wzWJ7tBS1Vzz4%2FdelUH9pTqhrE%3D&reserved=0">
great article</a> on ISMRE and why it's now included in ASHRAE 90.1.<o:p></o:p></p>
<p>Currently, I'm working on a model with a parametric run for a DOAS unit with an ISMRE that is better than baseline, and an EER that is worse than the baseline.
<o:p></o:p></p>
<p><strong><span style="font-family:"Calibri",sans-serif">How can I accurately model this improvement in ISMRE, and the resulting reduction in energy usage for the DOAS units?</span></strong><o:p></o:p></p>
<p>Googling "eQuest ISMRE" returns <a href="https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.google.com%2Fsearch%3Fq%3D%2522eQuest%2522%2B%2522ISMRE%2522&data=02%7C01%7CNicholas.Caton%40se.com%7Cb5c3aa2118f64e4f25fc08d6b9d0267e%7C6e51e1adc54b4b39b5980ffe9ae68fef%7C0%7C0%7C636900700993148902&sdata=hDJI4CoBE7wKIHzf2Y%2BvIVUjkVmwdyO22Dc8vkYuc%2FI%3D&reserved=0">
only four hits</a>, none of which are relevant.<o:p></o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Lee Shaver, Project Manager<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Slipstream</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
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