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">
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>
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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>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Kalpakrit Sustainable Environments Pvt. Ltd. </span></font><font size="2" face="Garamond"><span style="font-size: 10pt; font-family: Garamond;"></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">New
Delhi</span></font><font size="2" face="Garamond"><span style="font-size: 10pt; font-family: Garamond;"></span></font></p>
<p class="MsoNormal"><font size="2" face="Arial"><span style="font-size: 10pt; font-family: Arial;">Tel: +91.124.4309490-92 Ext: 312 , Fax: +91.124.4309493</span></font></p>
<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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