<div>Dear Will,</div>
<div> </div>
<div>Thank you for your help on this!!</div>
<div> </div>
<div>The result was exactly as you mention below.</div>
<div> </div>
<div>But, why can't main heating coil work to meet the zone heating load if the reheating coil does not work ? </div>
<div> </div>
<div>~DE<br><br></div>
<div class="gmail_quote">2011/6/28 John Aulbach <span dir="ltr"><<a href="mailto:jra_sac@yahoo.com">jra_sac@yahoo.com</a>></span><br>
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<div style="FONT-FAMILY: times new roman,new york,times,serif; FONT-SIZE: 12pt">Sorry, Dong, if I did not interpret your question correctly. If you have a VAV system with reheat, you will ALWAYS have the reheat available, even if just in a space heating sense (in winter months). <br>
<br>You cannot change SYSTEM types in eQuest by Season. You are stuck with reheat (especially if electric). But IF you had Hot Water reheat, you COULD schedule your boiler off when you don't want the rehat to work.<br>
<br>Result? Your SYSTEM will try to reheat cold zones, and be unable to. You will get zones whose load you cannot meet as the power behind the reheat isn't there.<br><br>The DOE-2.2 engine behind eQuest combined the old SYSTEM and PLANT into HVAC. NOW, if your plant does not have the capability to heat or cool, space temperatures will rise. That wasmn't true in DOE-2.1E.<br>
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<b><span style="FONT-WEIGHT: bold">From:</span></b> DongEun Kim <<a href="mailto:equested@gmail.com" target="_blank">equested@gmail.com</a>><br></div><b><span style="FONT-WEIGHT: bold">To:</span></b> John Aulbach <<a href="mailto:jra_sac@yahoo.com" target="_blank">jra_sac@yahoo.com</a>><br>
<b><span style="FONT-WEIGHT: bold">Cc:</span></b> Will Mak <<a href="mailto:wmak@epsteinglobal.com" target="_blank">wmak@epsteinglobal.com</a>>; <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b><span style="FONT-WEIGHT: bold">Sent:</span></b> Mon, June 27, 2011 6:06:41 PM
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<div class="h5"><br><b><span style="FONT-WEIGHT: bold">Subject:</span></b> Re: [Equest-users] VAV with Electric Reheat<br></div></div></font>
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<div>Let me re-direct my question regarding reheating:</div>
<div> </div>
<div>How do I make my reheating (electric) work only(mainly) for cooling mode? <br></div>
<div>~DE<br></div>
<div class="gmail_quote">2011/6/27 John Aulbach <span dir="ltr"><<a href="mailto:jra_sac@yahoo.com" rel="nofollow" target="_blank">jra_sac@yahoo.com</a>></span><br>
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<div style="FONT-FAMILY: times new roman,new york,times,serif; FONT-SIZE: 12pt">DongEun:<br><br>There is no difference, except to make the secondary heating coil ELECTRIC. No problem in eQuest.<br><br>John Aulbach<br>
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<b><span style="FONT-WEIGHT: bold">From:</span></b> DongEun Kim <<a href="mailto:equested@gmail.com" rel="nofollow" target="_blank">equested@gmail.com</a>><br><b><span style="FONT-WEIGHT: bold">To:</span></b> Will Mak <<a href="mailto:wmak@epsteinglobal.com" rel="nofollow" target="_blank">wmak@epsteinglobal.com</a>><br>
<b><span style="FONT-WEIGHT: bold">Cc:</span></b> <a href="mailto:equest-users@lists.onebuilding.org" rel="nofollow" target="_blank">equest-users@lists.onebuilding.org</a><br><b><span style="FONT-WEIGHT: bold">Sent:</span></b> Sun, June 26, 2011 9:19:02 PM<br>
<b><span style="FONT-WEIGHT: bold">Subject:</span></b> Re: [Equest-users] VAV with Electric Reheat<br></font>
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<div></div>
<div><br>
<div>Will,</div>
<div> </div>
<div>If I understand correctly, reheat Delta T, which was to specify max reheat coil capacity.</div>
<div> </div>
<div>What I want is to switch reheat source from 'how water' to 'ectricity', while the heating source for </div>
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<div>the main heating coil is 'how water.'</div>
<div> </div>
<div>Thank you.</div>
<div> </div>
<div>~DE<br><br></div>
<div class="gmail_quote">2011/6/24 Will Mak <span dir="ltr"><<a href="mailto:wmak@epsteinglobal.com" rel="nofollow" target="_blank">wmak@epsteinglobal.com</a>></span><br>
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<p class="MsoNormal"><span style="COLOR: rgb(31,73,125); FONT-SIZE: 10pt">You have to put a value for the reheat delta T or the reheat coils don’t kick on.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="COLOR: rgb(31,73,125); FONT-SIZE: 10pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="COLOR: rgb(199,91,18)">William Mak, LEED AP BD+C</span></b><span style="COLOR: rgb(31,73,125); FONT-SIZE: 9pt"><br></span><span style="COLOR: black; FONT-SIZE: 8pt">Mechanical Design Engineer</span><span style="COLOR: black; FONT-SIZE: 9pt"><br>
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<p class="MsoNormal"><b><span style="FONT-SIZE: 10pt">From:</span></b><span style="FONT-SIZE: 10pt"> <a href="mailto:equest-users-bounces@lists.onebuilding.org" rel="nofollow" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" rel="nofollow" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>DongEun Kim<br>
<b>Sent:</b> Thursday, June 23, 2011 11:58 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org" rel="nofollow" target="_blank">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] VAV with Electric Reheat<u></u><u></u></span></p>
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<p class="MsoNormal"><u></u> <u></u></p>
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<p class="MsoNormal"><span style="COLOR: navy; FONT-SIZE: 10pt">Hi all,</span><u></u><u></u></p></div>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal"><span style="COLOR: navy">Can anyone give me an advice regarding a problem described below?</span><u></u><u></u></p></div>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal"><span style="COLOR: navy; FONT-SIZE: 10pt">I need to model a VAV system with chilled water coil and hot water coil, and also with Electric Reheating.</span><u></u><u></u></p></div>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal"><span style="COLOR: navy; FONT-SIZE: 10pt">As a start, I selected 'VAV with HW Reheat' system.</span><u></u><u></u></p></div>
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<p class="MsoNormal"><span style="COLOR: navy; FONT-SIZE: 10pt"> </span><u></u><u></u></p></div>
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<p class="MsoNormal"><span style="COLOR: navy; FONT-SIZE: 10pt">However, I've realized that the system only generates a reheating coil without a main hot water coil(heating coil).</span><u></u><u></u></p></div>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal"><span style="COLOR: navy; FONT-SIZE: 10pt">So I installed 'heating coil' in the detailed mode, and then,</span> <span style="COLOR: navy">I changed the zone heat source to be 'electric'.</span><u></u><u></u></p>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal"><span style="COLOR: navy; FONT-SIZE: 10pt">However when I take a look at the result, there came two problems.</span><u></u><u></u></p></div>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal"><span style="COLOR: navy; FONT-SIZE: 10pt">1. Heating was mainly done by reheating coil not by main heating coil.</span><u></u><u></u></p></div>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal"><span style="COLOR: navy; FONT-SIZE: 10pt">2. Reheating didn't seem to use electricity.</span><u></u><u></u></p></div>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal">Any advice will be greatly appreciated.<u></u><u></u></p></div>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal">Thank you in advance.<u></u><u></u></p></div>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal">~DE <u></u><u></u></p></div>
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<p class="MsoNormal"> <u></u><u></u></p></div>
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<p class="MsoNormal"><span style="COLOR: navy">Kim, DongEun(DE) | Research Engineer, LEED AP<br>Annex R&D Institute, HIMEC(Hanil Mech. & Elec. Consultants)</span><u></u><u></u></p></div>
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