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<p>Hsein,</p>
<p> Without seeing the project file it is not really possible to
know what the problem might be. The problem might not be P_LOAD;
you might look at how the other variables (Q_heating, Q_DHW,
Q_cooling, m_H2, and LHV) are defined. If there are not
connections to those variables or if those variables are not
defined in other equations then you'd get the attached error.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 05/24/2016 05:05, Hsein Moussawi via
TRNSYS-users wrote:<br>
</div>
<blockquote
cite="mid:DBXPR03MB4133DA942F696D7CB1937B5E14F0@DBXPR03MB413.eurprd03.prod.outlook.com"
type="cite">
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<p style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">Hi everyone,</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;"><br>
</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">I am trying to calculate the following
equation:</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;"><br>
</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">Eff_energy =
(P_net+Q_heating+Q_DHW+Q_cooling)/(Max(0.000001,m_H2)*LHV)<br>
</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;"><br>
</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">I made a link between P_load (which is being
calculated in different equation) and P_net, but I am still
getting this problem:</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;"><br>
</p>
<p style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">[</p>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">
<b>TRNSYS Message 20 : The referenced variable used in
this equation has not been defined in the TRNSYS input file.
The equation begins with the string in "reported
information"</b></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">
<b>Reported information : EFF_ENERGY = (P_LOAD</b></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">
]</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">
In fact I supposed another equation : kkkk = P_load and it
gave me the output correctly without any problems, so I am
wondering what is the problem!!!</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif;
font-size: 16px;">
Please HELP!!! Any hint would be appreciated...</div>
<br>
</div>
<br>
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<br>
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</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI 53703 USA
P:+1.608.274.2577
F:+1.608.278.1475
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.tess-inc.com">http://www.tess-inc.com</a>
<a class="moz-txt-link-freetext" href="http://www.trnsys.com">http://www.trnsys.com</a></pre>
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