The other thing at work here is that the Induction units and the DOAS are constant volume, so you're going to pay a fan energy penalty for this - so first, make sure you only have one zone per Induction unit in eQUEST. In real life, the DOAS can send variables amounts of air (based on load) to chilled beams, but this can't be modeled with the Dummy zone/DOAS approach. If you change the system type to a Power Induction Unit (which is a VAV) and you zero out the fan power, this might work.<br>
<br>There is no induction ratio parameter then, but I have played around with that parameter in eQUEST and seen almost no impact from varying it.<br><br>I am attempting to modeling an active chilled beam system served by a VAV DOAS right now, so if anyone else has comments on the Power Induction Unit approach, please let me know!<br>
<br><br clear="all">Kendra Tupper, PE, LEED AP<br>Senior Consultant<br>Built Environment Team<br><br>Rocky Mountain Institute | T 303-567-8641 | F 303-245-7213 | <a href="http://www.rmi.org">www.rmi.org</a><br>
<br><br><div class="gmail_quote">On Thu, May 6, 2010 at 9:37 AM, Ellen Franconi <span dir="ltr"><<a href="mailto:efranconi@rmi.org">efranconi@rmi.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Vishnu,<br>I am not sure I completely follow what you did but perhaps you are not aware that the induction unit system includes a central fan for pretreating outside air delivered to the induction units. So if you used the "outside air from sys" approach,the central fan of the induction unit would still be modeled with its default parameters. Also, if you don't set the induction ratio high enough (e.g. default is 3, max value is 10), you will get return air mixing with your supply (e.g it will no longer be 100% OA), which will make your supply air flow higher. This will increase your fan energy use as well. <br>
<br>I don't think the eQUEST documentation includes a description of the induction unit system (TPIU or FPIU) but its relevant keywords can found in the DOE2.1E BDL Summary. You could also insert the following commands in your input file.<br>
<br>DIAGNOSTICS DEFAULTS .. $ before the SYSTEM command and<br>
DIAGNOSTICS CAUTIONS .. $ after the SYSTEM command<br><br>Adding the above will show in the BDL file the value for all keywords not explicitly listed but with default values being used.<br>Ellen<br><br><div class="gmail_quote">
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On Wed, May 5, 2010 at 11:14 PM, Vishnuraj Nair <span dir="ltr"><<a href="mailto:vishnu@kalpakrit.com" target="_blank">vishnu@kalpakrit.com</a>></span> wrote:<br>
</div></div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><div><div></div><div class="h5">
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<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Dear friends,</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">I am modeling the active chilled beams system using an induction
unit. I have created a separate treated outside air system (TOAS) from where
the fresh air would be supplied to </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">the induction unit. I have hard coded the fresh air
requirement for each zone at the outdoor air CFM field under outside air tab as
well as under design flow cfm field under air flow tab</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">so that the only the fresh air requirement is supplied to
the zone. The cooling will be done by chilled beams modeled as induction unit.</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">when I see the simulation report the amount of fan energy
consumed is huge which is nearly about 20% percent of the overall energy
consumption.</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">So then I zeroed out the fan energy i.e kW/CFM for fans =0
and only the TOAS has the fan energy but the fan energy consumption decreased
very little.</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">I have no other source in the model for which the fan energy
could be accountable for.</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;"> </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Can anyone please tell what can be the reason for this or if
I am missing out on something? </span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Am I modeling the system right? How is the fan energy for
this system to be modeled?</span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Vishnuraj Nair</span></font></p>
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<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">E-mail : <a href="mailto:vishnu@kalpakrit.com" target="_blank">vishnu@kalpakrit.com</a></span></font><font size="2"><span style="font-size: 10pt;"></span></font></p>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Ellen Franconi, PhD, LEED AP<br>Senior Consultant, Built Environment Team<br><br>Rocky Mountain Institute<br>1820 Folsom Street<br>Boulder, CO 80302<br>303.567.8609 (Desk)<br>
303.245.7213 (Fax)<br><br>Rocky Mountain Institute drives the efficient and restorative use of<br>resources, creating a world thriving, verdant, and secure, for all, for ever.<br><br><a href="http://www.rmi.org" target="_blank">http://www.rmi.org</a><br>
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