Hi Ana,<br><br>As always it would be good to see what you are looking at so if you feel comfortable sending your .inp and .pd2 files please do. I'm not sure why the HIR field is grayed out but I can understand why 2 HIR curves would confuse eQUEST. You will have to do a parametric run or just run your model twice, once with one curve and again with the other curve. Also, be sure to read the information about curves and curve inputs in the DOE2 manual. All the data needs to be normalized around the ARI conditions and the ARI conditions always equal 1.0. It can be confusing at first.<br>
<br>Good luck!<br><br>Carol<br><br><div class="gmail_quote">On Wed, Sep 29, 2010 at 2:29 PM, Ana N. <span dir="ltr"><<a href="mailto:ananeddav@hotmail.com">ananeddav@hotmail.com</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;">
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<p><font size="3" face="Times New Roman">Dear e-quest users,</font></p>
<p><font size="3" face="Times New Roman"></font> </p>
<p><font size="3" face="Times New Roman">I am modeling a central ground source heat pump that provides both cooling and heating by using the Loop to Loop Heat Pump. I am trying to derive the performance curves based on a very detailed set of data provided by the manufacturer. What confuses me is that HIR field under the performance curve tab is grayed out. </font></p>
<p><font size="3" face="Times New Roman"> </font></p>
<p><font size="3" face="Times New Roman">I have derived one curve by combining the performance data for cooling and heating mode (by using methodology described for chillers, <span style="font-size: 12pt; font-family: 'Times New Roman';">“<a href="http://www.taylor-engineering.com/downloads/articles/ASHRAE%20Symposium%20AC-02-9-1%20Electric%20Chiller%20Model-Hydeman.pdf" target="_blank"><span style="color: windowtext; text-decoration: none;">Tools and Techniques to Calibrate Electric Chiller Component Models</span></a>, ASHRAE Symposium” </span>). I am not sure this is the correct approach. Should I create one EIR curve by combining the data for cooling and heating (EIR= f(T evaporator leaving, T cond entering) and leave HIR curve “grayed out”?</font></p>
<p><font size="3" face="Times New Roman">I also run the model with two separate curves </font></p>
<p><font size="3" face="Times New Roman">EIR= f (T evaporator leaving, T cond entering), </font></p>
<p><font size="3" face="Times New Roman">HIR= f(T evaporator leaving, T cond entering),</font></p>
<p><font size="3" face="Times New Roman">each derived using the performance data for corresponding mode of operation.</font></p>
<p><span><font size="3" face="Times New Roman"> </font></span><font size="3" face="Times New Roman">However, when I run the model with two different HIR curves, the result remains unchanged as if e-quest does not use this curve at all.</font></p>
<p><font size="3" face="Times New Roman">At this point, I am using default EIR=f( part load). I am still using e-quest 3-63.</font></p>
<p><font size="3" face="Times New Roman"> </font></p>
<p><font size="3" face="Times New Roman">I would really appreciate sharing your experience in modeling the Loop to Loop Heat Pump and deriving custom curves.</font></p>
<p><font size="3" face="Times New Roman"> </font></p>
<p><font size="3" face="Times New Roman">Thank you</font></p>
<p><font size="3" face="Times New Roman"></font> </p>
<p><font size="3" face="Times New Roman">Ana</font></p>
<p><font size="3" face="Times New Roman"> </font></p> </div>
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<br></blockquote></div><br><br clear="all"><br>-- <br>Carol Gardner PE<br>
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