Hi Aswan,<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<br><br><div class="gmail_quote">On Wed, Mar 11, 2009 at 6:21 AM, Aswan Ali <span dir="ltr"><<a href="mailto:aswan.ali@hurleypalmerflatt.com">aswan.ali@hurleypalmerflatt.com</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="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 style="margin-top: 0cm;" 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 style="margin-top: 0cm;" 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 style="margin-top: 0cm;" 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><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"></span></font></p>
<p style="margin: 0cm 0cm 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</span></font></b><b><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; font-weight: bold;" lang="EN-GB"> <br>
Graduate Mechanical Engineer</span></font></b><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"></span></font></p>
<p style="margin: 0cm 0cm 0.0001pt;"><b><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial; font-weight: bold;" lang="EN-GB">Building Services Division</span></font></b><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"></span></font></p>
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<p style="margin: 0cm 0cm 0.0001pt;"><b><font size="5" color="#00387d" face="Arial"><span style="font-size: 18pt; font-family: Arial; color: rgb(0, 56, 125); font-weight: bold;" lang="EN-GB">hurleypalmerflatt</span></font></b><b><i><font size="1" color="#00387d" face="Arial"><span style="font-size: 8pt; font-family: Arial; color: rgb(0, 56, 125); font-weight: bold; font-style: italic;" lang="EN-GB"> </span></font></i></b></p>
<p style="text-indent: 63pt;"><b><i><font size="1" color="#00387d" face="Arial"><span style="font-size: 8pt; font-family: Arial; color: rgb(0, 56, 125); font-weight: bold; font-style: italic;" lang="EN-GB">building</span></font></i></b><font size="1" color="#00387d" face="Arial"><span style="font-size: 8pt; font-family: Arial; color: rgb(0, 56, 125);" lang="EN-GB"> </span></font><b><font size="1" color="#29b004" face="Arial"><span style="font-size: 8pt; font-family: Arial; color: rgb(41, 176, 4); font-weight: bold;" lang="EN-GB">sustainability</span></font></b><font size="1" face="Arial"><span style="font-size: 7pt; font-family: Arial;" lang="EN-GB">
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<p style="margin: 0cm 0cm 0.0001pt;"><b><b><font size="3" face="Times New Roman"><span style="font-size: 12pt;" lang="DE">e:</span></font></b></b><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="DE"> </span></font><a href="mailto:aswan.ali@hurleypalmerflatt.com" target="_blank"><span lang="DE">aswan.ali@hurleypalmerflatt.com</span></a><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;" lang="DE"></span></font></p>
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