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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">Catalina,</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">This is a complex scenario to model in TRACE 700 and I wanted to shed some light on what is possible and not possible.</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">The limitations you’re finding are related to how system coils are assigned to equipment (plants), and ground heat exchangers. TRACE 700 can only model a single ground heat
exchanger per alternative and system coils (e.g. cooling and heating coils) are assigned to a plant, rather than an individual piece of equipment. In your scenario, you may have one or two ground loops but you’ll only be able to model a single loop in the
alternative. This limitation prevents you from modeling the systems independently.</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">If you create two ground source heat pump pieces of equipment, you’ll still need to assign these to a single plant. Doing so does not allow you to independently operate each
plant based upon system coil load because cooling and heating coils are assigned to plants rather than equipment. The sequencing options will not help you in this instance.</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">To model this system, you’ll need to make a ground source heat pump system as shown in the User’s Manual. You can make a single cooling plant (water source heat pump equipment
type) and modify the energy rate and ground loop information as you desire. You may wish to use a composite energy rate the best represents all heat pumps on the ground loop(s).</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif""> </span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">I suspect that the information you received from C.D.S. is correct in that you can model two separate heat pump plants, but you cannot model two separate ground loops in a
single file. </span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">Regards,</span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">Eric Sturm</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">Applications Engineer</span></p>
<p class="MsoNormal"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"">Trane Commercial Systems</span></p>
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<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""> trace-users-bounces@lists.onebuilding.org [mailto:trace-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Caballero, Catalina<br>
<b>Sent:</b> Tuesday, November 27, 2012 2:57 PM<br>
<b>To:</b> 'trace-users@lists.onebuilding.org'<br>
<b>Subject:</b> [Trace-users] Multiple Ground source Heatpump in one alternative</span></p>
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<p class="MsoNormal"> </p>
<p class="MsoNormal">Good afternoon,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I’m trying to find out a way to model 2 ground source heat pumps in an alternative. One of these systems serves an exhibition spaces, and the other one serves a mechanical room. When I call CDS some representatives say it’s possible, others
don’t think so, making it more confusing. Anybody has experience with this issue?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Regards,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:black">Catalina Caballero, AIA. Assoc., LEED GA.</span><b><i><span style="font-size:10.0pt; font-family:"Arial","sans-serif"; color:#1F497D"></span></i></b></p>
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