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<P class=ecxMsoNormal><FONT face="Times New Roman" size=3>Dear e-quest users,</FONT></P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3></FONT> </P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3>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 class=ecxMsoNormal><FONT face="Times New Roman" size=3> </FONT></P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3>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'; mso-fareast-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA">“<A href="http://www.taylor-engineering.com/downloads/articles/ASHRAE%20Symposium%20AC-02-9-1%20Electric%20Chiller%20Model-Hydeman.pdf"><SPAN style="COLOR: windowtext; TEXT-DECORATION: none; text-underline: 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 class=ecxMsoNormal><FONT face="Times New Roman" size=3>I also run the model with two separate curves </FONT></P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3>EIR= f (T evaporator leaving, T cond entering), </FONT></P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3>HIR= f(T evaporator leaving, T cond entering),</FONT></P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3>each derived using the performance data for corresponding mode of operation.</FONT></P>
<P class=ecxMsoNormal><SPAN><FONT face="Times New Roman" size=3> </FONT></SPAN><FONT face="Times New Roman" size=3>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 class=ecxMsoNormal><FONT face="Times New Roman" size=3>At this point, I am using default EIR=f( part load). I am still using e-quest 3-63.</FONT></P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3> </FONT></P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3>I would really appreciate sharing your experience in modeling the Loop to Loop Heat Pump and deriving custom curves.</FONT></P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3> </FONT></P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3>Thank you</FONT></P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3></FONT> </P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3>Ana</FONT></P>
<P class=ecxMsoNormal><FONT face="Times New Roman" size=3> </FONT></P> </body>
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