Robert-<div><br></div><div><span class="Apple-style-span" style="font-family: 'Helvetica Neue', Arial, sans-serif; font-size: 14px; color: rgb(68, 68, 68); line-height: 20px; ">Sorry, but no, it is not acceptable to model as 1 system since your model will not match your design documents, and your LEED reviewer will probably have a system overload and die. You do not want that blood on your hands. </span></div>
<div><font class="Apple-style-span" color="#444444" face="'Helvetica Neue', Arial, sans-serif"><span class="Apple-style-span" style="font-size: 14px; line-height: 20px;"><br></span></font></div><div><font class="Apple-style-span" color="#444444" face="'Helvetica Neue', Arial, sans-serif"><span class="Apple-style-span" style="font-size: 14px; line-height: 20px;">They are both very common points of confusion in TRACE (as John confirms!) so I answered your questions at: <a href="http://energy-models.com/forum/energy-modeling-software/trace-700/dedicated-oa-and-split-system#comment-1261">http://energy-models.com/forum/energy-modeling-software/trace-700/dedicated-oa-and-split-system#comment-1261</a> </span></font></div>
<div><font class="Apple-style-span" color="#444444" face="'Helvetica Neue', Arial, sans-serif"><span class="Apple-style-span" style="font-size: 14px; line-height: 20px;"><br></span></font></div><div><font class="Apple-style-span" color="#444444" face="'Helvetica Neue', Arial, sans-serif"><span class="Apple-style-span" style="font-size: 14px; line-height: 20px;">I posted an image too, and the post is pretty long, so I left it on the forum.</span></font></div>
<div><font class="Apple-style-span" color="#444444" face="'Helvetica Neue', Arial, sans-serif"><span class="Apple-style-span" style="font-size: 14px; line-height: 20px;"><br></span></font></div><div><font class="Apple-style-span" color="#444444" face="'Helvetica Neue', Arial, sans-serif"><span class="Apple-style-span" style="font-size: 14px; line-height: 20px;">I briefly addressed John's return air volume problem as well. Don't forget to click the image to enlarge it!,</span></font></div>
<div><font class="Apple-style-span" color="#444444" face="'Helvetica Neue', Arial, sans-serif"><span class="Apple-style-span" style="font-size: 14px; line-height: 20px;"><br></span></font></div><div><font class="Apple-style-span" color="#444444" face="'Helvetica Neue', Arial, sans-serif"><span class="Apple-style-span" style="font-size: 14px; line-height: 20px;">Bob</span></font></div>
<div><div><br><div class="gmail_quote">On Thu, Feb 3, 2011 at 3:46 AM, Robert Arnott <span dir="ltr"><<a href="mailto:arnott.robert@gmail.com">arnott.robert@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse"></span>Hi all,<br><br><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse"><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse">I am a new Trace 700 user and I'm busy modelling a building for LEED. I'm struggling with two fundamental aspects of how the HVAC system modelling works in Trace.</span></span><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse"><br>
</span><br><div style="margin-left:40px"><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse">1. The
building uses a split unit heating/cooling system, with a completely
separate dedicated outdoor air system for fresh air. </span><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse">The fresh air supply is
constant and does not vary with the heating and cooling load. The split unit draws air directly from each zone (recirculating indoor air only) and is not at all connected to the supply ducting of the fresh air. Since there are two completely independent systems serving the same zones, how should this be modelled for LEED? Would it be acceptable to assume that a single system is being used, and that the heating/cooling is done directly on the supply air?<br>
<br>2. All zones receive fresh air, with only the bathrooms exhausting air, creating a definite airflow network between the zones. If I set every zone's "Adjacent air transfer </span><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse"></span>from room" to the passageway connecting all the zones, will Trace determine the correct airflow rate and direction between each zone? Or is the adjacent air transfer directional, so that the bathroom would need to be set to have an airflow transfer from the passage, then the passage would need an airflow transfer from multiple zones (but trace only allows a single zone to be set)?<br>
</div><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse"><br>I'd appreciate any feedback. Thanks in advance!<br></span><span style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse"></span><br clear="all">
Regards,<br><font color="#888888">Robert<br>
<div></div>
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