<font size=2 face="sans-serif">Eric,</font>
<br>
<br><font size=2 face="sans-serif">I am surprised to hear you say that
TRACE will not allow two separate ground loops in a single file because
if you create multiple cooling plants with ground loops, you are allowed
to specify different parameters for "TLoop Ent Bldg" under Plant
Controls, Geothermal Loop. When you run the model, you even get different
energy use results for each cooling plant (GSHP) when you have two identical
rooms with one assigned to each cooling plant (since the temperature of
the ground loop is different based on TLoop Ent Bldg). This implies that
there are two separate loops, otherwise the one loop would have two different
entering temperatures simultaneously.</font>
<br>
<br><font size=2 face="sans-serif">Catalina, does that address the question
that you asked?</font>
<br>
<br><font size=2 face="sans-serif"><b>Alex N. Chapin, </b></font><font size=2 color=#008000 face="sans-serif"><b>LEED
AP BD+C</b></font>
<br><font size=2 face="sans-serif">Sustainability Program Engineer</font>
<br>
<br><font size=2 face="sans-serif"><b>SRI Quality System Registrar</b></font>
<br><font size=2 face="sans-serif">300 Northpointe Circle, Suite 304</font>
<br><font size=2 face="sans-serif">Seven Fields, PA 16046</font>
<br><font size=2 face="sans-serif">phone: 724.934.9000 x619; fax: 724.934.9145</font>
<br><font size=2 face="sans-serif">AChapin@sriregistrar.com</font>
<br>
<br><tt><font size=2>Date: Tue, 27 Nov 2012 21:48:11 +0000<br>
From: "Sturm, Eric" <esturm@trane.com><br>
To: "Caballero, Catalina" <ccaballero@jalrw.com><br>
Cc: "'trace-users@lists.onebuilding.org'"<br>
<trace-users@lists.onebuilding.org><br>
Subject: Re: [Trace-users] Multiple Ground source Heatpump in one<br>
alternative<br>
Message-ID:<br>
<B15E874B9BE11D42A67F232B539E6F9B275D48@012-BR1MPN1-011.mgdir.irco.com><br>
<br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Catalina,<br>
<br>
This is a complex scenario to model in TRACE 700 and I wanted to shed some
light on what is possible and not possible.<br>
<br>
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.<br>
<br>
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.<br>
<br>
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).<br>
<br>
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.<br>
<br>
Regards,<br>
Eric Sturm<br>
Applications Engineer<br>
Trane Commercial Systems<br>
Ingersoll Rand<br>
3600 Pammel Creek Rd<br>
La Crosse, WI 54601<br>
<br>
Office: +1.608.787.3736<br>
Fax: +1.608.787.3005<br>
Email: esturm@trane.com<</font></tt><a href=mailto:esturm@trane.com><tt><font size=2>mailto:esturm@trane.com</font></tt></a><tt><font size=2>><br>
Website: </font></tt><a href=www.trane.com><tt><font size=2>www.trane.com</font></tt></a><tt><font size=2><br>
<br>
From: trace-users-bounces@lists.onebuilding.org [</font></tt><a href="mailto:trace-users-bounces@lists.onebuilding.org"><tt><font size=2>mailto:trace-users-bounces@lists.onebuilding.org</font></tt></a><tt><font size=2>]
On Behalf Of Caballero, Catalina<br>
Sent: Tuesday, November 27, 2012 2:57 PM<br>
To: 'trace-users@lists.onebuilding.org'<br>
Subject: [Trace-users] Multiple Ground source Heatpump in one alternative<br>
<br>
Good afternoon,<br>
<br>
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?<br>
<br>
Regards,<br>
<br>
Catalina Caballero, AIA. Assoc., LEED GA.<br>
Johnson, Avedano, Lopez, Rodriguez & Walewski<br>
Engineering Group, Inc.<br>
<br>
2510 NW 97th Avenue, Suite 220, Miami, Florida 33172<br>
Tel. (305) 594-0660 Ext. 217 Fax (305) 594-0907<br>
<br>
Visit us online: </font></tt><a href=www.jalrw.com><tt><font size=2>www.jalrw.com</font></tt></a><tt><font size=2><</font></tt><a href=http://www.jalrw.com/><tt><font size=2>http://www.jalrw.com/</font></tt></a><tt><font size=2>><br>
</font></tt>