Josh,<br><br>I have not used the induction unit as I believe that system limits ventilation air heat recovery options, and most of my buildings use ventilation heat recovery. Regarding modeling of zones, in offices, I usually include closets in the office zone. It's silly to model these tiny spaces separately as it just complicates the model and doesn't add any significant accuracy. Now, if you have a large storage area in the middle of an open office that might have different use patterns, and is treated as a core zone, then you'd want to model it separately.<br>
<br>Regarding mechanical spaces... I usually model these spaces as "minimally conditioned spaces" meaning that they are supplied with heating and cooling, but the thermostat is set low for heating and high for cooling. Of course this is consistent in both the baseline and proposed design. The section in Appendix G on schedules allows some flexibility as long as it's approved by the rating authority. Then, your "dummy" system won't use much energy as the bulk of the energy will be transferred from other spaces. This might be easier to deal with in other programs that model airflow between spaces, so you could model exhaust airlfow and have it transfer from another space.<br>
<br>Aswan,<br><br>Zones can be simplified a little bit. Basically, use your judgment. Sorry I can't be of more use. If you want to outline zones on a floorplan and send it directly to me, I could give you some feedback.<br>
<br>--<br>Karen<br><br><div class="gmail_quote">On Wed, Mar 11, 2009 at 11:12 AM, Josh Doherty <span dir="ltr"><<a href="mailto:jdoherty@dcengineering.net">jdoherty@dcengineering.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
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<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Hi Karen,</span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">In response to your comment about making
sure you do not model closets separately, how do you treat small janitor and
mech/electrical closets (small rooms)? How you should model these areas gets
complicated because of the LEED requirement that all zones must be modeled as
being heated and cooled, even though these types of areas are typically
supplied with just an exhaust and they “steal” some heating and
cooling from surrounding spaces. I have been grouping all these areas into
one HVAC system and assigning a “dummy” heating and cooling system.
What is wrong with this approach? Let’s take for example an open
office area floor plan. Should the closets just be included in the open
area zone or should they be assigned to their own zone?</span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Also, I am currently working on building a
model of a system with active chilled beams. I believe eQuest can closely
approximate a chilled beam system with the available <u>Induction Unit</u> HVAC
system type. Do you have any experience using the Induction Unit to
represent the active chilled beam systems? </span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Thanks for all your help.</span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
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<p><b><b><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;">Josh Doherty</span></font></b></b><font color="navy"><span style="color: navy;"></span></font></p>
<p><font size="2" color="navy" face="Arial"><span style="font-size: 10pt; font-family: Arial; color: navy;"> </span></font></p>
<p><font size="3" color="navy" face="Times New Roman"><span style="font-size: 12pt; color: navy;"> </span></font></p>
<p><font size="3" color="navy" face="Times New Roman"><span style="font-size: 12pt; color: navy;"> </span></font></p>
<p><font size="3" color="navy" face="Times New Roman"><span style="font-size: 12pt; color: navy;"> </span></font></p>
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<div style="text-align: center;" align="center"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">
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<p><b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size: 10pt; font-family: Tahoma;"> <a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org" target="_blank">equest-users-bounces@lists.onebuilding.org</a>] <b><span style="font-weight: bold;">On Behalf Of </span></b>Karen Walkerman<br>
<b><span style="font-weight: bold;">Sent:</span></b> Wednesday, March 11, 2009
8:49 AM<div class="im"><br>
<b><span style="font-weight: bold;">To:</span></b> Aswan Ali<br>
<b><span style="font-weight: bold;">Cc:</span></b> <a href="mailto:equest-users@lists.onebuilding.org" target="_blank">equest-users@lists.onebuilding.org</a><br>
<b><span style="font-weight: bold;">Subject:</span></b> Re: [Equest-users] eQUEST
- new user</div></span></font></p>
</div>
<p><font size="3" face="Times New Roman"><span style="font-size: 12pt;"> </span></font></p>
<p style="margin-bottom: 12pt;"><font size="3" face="Times New Roman"><span style="font-size: 12pt;">Hi Aswan,<div><div></div><div class="h5"><br>
<br>
1. This depends partly on what the model is for. If this is a LEED
model, the zones should be modeled as designed in the mechanical plan. If
it's not, you may want to simplify further, combining zones with similar uses
and exposures as long as you are pretty confident that the hourly heading and
cooling loads will be similar. Definitely err on the side of simplicity
and whatever you do, don't model closets separately.<br>
<br>
2. You can define one AHU that serves multiple spaces, regardless of
where those spaces are. You might have to do some fine-tuning in detailed
edit mode in order to get everything set-up the way you want. There is no
chilled beam in eQuest. You'll have to modify an airside cooling system to
approximate the chilled beam. Search the archives for info on how to do
this. There have been at least a few discussions on the list serve in the
past regarding this issue.<br>
<br>
3. It's possible to model CHP systems in detailed mode. Basically,
create an electric generator, select the fuel source and select the heat reject
loops. You can adjust the performance curves to match the type of
equipment you want to model. A word of caution: eQuest does not know the
temperature at which the generator is rejecting heat. Therefore it's
possible to model a generator that rejects heat at 85 F into a loop that needs
to be maintained at 180 F, but this violates the laws of thermodynamics!<br>
<br>
--<br>
Karen</div></div></span></font></p><div><div></div><div class="h5">
<div>
<p><font size="3" face="Times New Roman"><span style="font-size: 12pt;">On Wed, Mar 11, 2009 at 6:21 AM, Aswan Ali <<a href="mailto:aswan.ali@hurleypalmerflatt.com" target="_blank">aswan.ali@hurleypalmerflatt.com</a>>
wrote:</span></font></p>
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<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB">Hi all,</span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB">I’ve just started creating my first model on eQuest and can really
do with some advice. </span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB">The project is quite complex and consists of 2 high quality office
towers and an 8-storey trading and banking building.</span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB">The HVAC systems serving the 3 buildings vary from VAV, chilled beams,
perimeter trench heating, AHUs with reheat to CHPs.</span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB">I have the following questions please:</span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<ol start="1" type="1">
<li><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB">What things should I consider
when creating the HVAC zones?</span></font></li>
</ol>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<ol start="2" type="1">
<li><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB">How should I model the
different HVAC systems? For example, when one or more AHUs are serving
multiple floors, do I define each AHU separately and assign them to the
various HVAC zones?</span></font></li>
</ol>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<ol start="3" type="1">
<li><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB">How can I model a combined heat
and power (CHP) system?</span></font></li>
</ol>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB">Your help is very much appreciated. </span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<p><font size="3" face="Arial"><span style="font-size: 12pt; font-family: Arial;" lang="EN-GB">Kind regards,</span></font></p>
<p><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB"> </span></font></p>
<p style="margin: 0in 0in 0.0001pt;"><b><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; font-weight: bold;" lang="EN-GB">Aswan</span></font></b><b><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; font-weight: bold;" lang="EN-GB"> Ali <br>
Graduate Mechanical Engineer</span></font></b></p>
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