<div dir="ltr">Thank you Sheila and Javed. However, there is still a gap in understanding the exceptions. The question is whether the exception should be combined as:<div> <div>1. Exception "a" says about dominant and non-dominant space type; and source of heating for more than 20,000 sqft area.</div><div>2. Exception "b" says about use of system 3 and 4 for different cooling load and/or different schedule based on building heating source type (explicitly written).</div><div><br></div><div>However, for exception "e" should it be combined with exception "b" or "a"?</div><div><br></div><div>Thanks again!</div><div><br></div><div>Regards,</div><div>Mayank</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Jul 17, 2018 at 8:27 PM, Javed Iqbal <span dir="ltr"><<a href="mailto:javedvit@gmail.com" target="_blank">javedvit@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(7,55,99)">Hi,</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(7,55,99)"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(7,55,99)">In scenarios where both gas and electricity are used as a heating source for the proposed system—for example, in the case of water loop heat pumps, which might be served by a gas-fired boiler, or a specific building with gas-fired dedicated outdoor air systems (DOAS) and all electric terminal units for heating—both electric and gas are counted toward the area served by the respective fuel type. Proposed building designs with systems like these are considered “hybrid” systems and map to the <u><b>fossil-fuel baseline</b></u>.<br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(7,55,99)"><div class="gmail_default"><br></div><div class="gmail_default">Hope this helps!!</div></div></div><br><div class="gmail_quote"><div><div class="h5"><div dir="ltr">On Tue, Jul 17, 2018 at 4:24 PM Mayank Bhatnagar via Bldg-sim <<a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.<wbr>org</a>> wrote:<br></div></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5"><div dir="ltr">
<div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">Dear All,</div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">We have a residential project<span> </span>with hybrid heating source (gas+electric) to condition the dwelling and corridor spaces. There are few electric heaters serving stairwells and storage spaces. As per exception 'e' of section G3.1.1, ASHRAE 90.1-2010, the thermal zones designed for heating only systems in the proposed design, serving storage rooms, stairwells etc. and not exhausting or transferring air from mechanically cooled thermal zones in the proposed design shall use system 9 or 10 in the baseline building design.</div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial"><br></div><div style="font-size:small;text-decoration-style:initial;text-decoration-color:initial">The query is whether the selection of system 9 or 10 is based on building heating source (hybrid in this case) or as per unit heater's heating source (electric).</div>
<br><div>Thank you.</div><div><br></div><div>Regards,</div><div><br></div><div>Mayank Bhatnagar</div><div><br></div><div>
<span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;color:rgb(0,102,0)">Senior Project Manager<br></span><b style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">Environmental Design Solutions Pvt. Ltd. [EDS]</b><br style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">D - 1/25<span> </span></span><br style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">Vasant Vihar</span><br style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">New Delhi - 110057</span><br style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><span style="font-size:small;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">India</span>
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</span></blockquote></div><span class="HOEnZb"><font color="#888888"><br clear="all"><div><br></div>-- <br><div dir="ltr" class="m_2227526688906701416m_-483136172041895729m_-5327518621694862m_-5412151153714377041gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><font face="arial, helvetica, sans-serif" size="2"><div style="font-style:italic"><i><font color="#0b5394"><br></font></i></div><font color="#073763">Javed Iqbal, LEED AP, CEA<br>Sr. Energy Analyst</font></font></div><div dir="ltr"><font size="2"><font face="arial, helvetica, sans-serif" color="#000000"><br></font></font></div><div dir="ltr"><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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