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<SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Carol, <?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN><BR>
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<SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">DOE22Vol2-Dictionary_47b, pages 220-221 indicate that only one curve should be used. That is why I tried creating only one curve. I assume we should create one curve EIR= t ( t evaporator leaving, t cond entering). It is relatively simple for the cooling mode. In the heating mode, the evaporator leaving temperature is actually the source fluid leaving temperature (manufacturers typically provide the data for the source fluid entering temperature), while the condenser entering temperature would be the load fluid entering temperature (manufactures typically provide the data for the load fluid leaving temperature). Do you agree with this rationale? Unfortunately, I do not like much the results I got.<BR>
<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">DOE22Vol2-Dictionary says that </SPAN>curves should be normalized at the Eurovent rating condition, rather than ARI. </SPAN></P>
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<P class=MsoNormal style="MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma"></SPAN><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Thank you<o:p></o:p></SPAN></P>
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<SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">Ana<o:p></o:p></SPAN><BR>
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Date: Wed, 29 Sep 2010 18:49:39 -0700<BR>Subject: Re: [Equest-users] FW: Custom curves - Loop to Loop Heat Pump<BR>From: cmg750@gmail.com<BR>To: ananeddav@hotmail.com<BR>CC: equest-users@lists.onebuilding.org<BR><BR>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=ecxgmail_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=ecxgmail_quote style="PADDING-LEFT: 1ex">
<DIV> <BR>
<FONT face="Times New Roman" size=3>Dear e-quest users,</FONT><BR>
<FONT face="Times New Roman" size=3></FONT> <BR>
<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><BR>
<FONT face="Times New Roman" size=3> </FONT><BR>
<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'">“<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><BR>
<FONT face="Times New Roman" size=3>I also run the model with two separate curves </FONT><BR>
<FONT face="Times New Roman" size=3>EIR= f (T evaporator leaving, T cond entering), </FONT><BR>
<FONT face="Times New Roman" size=3>HIR= f(T evaporator leaving, T cond entering),</FONT><BR>
<FONT face="Times New Roman" size=3>each derived using the performance data for corresponding mode of operation.</FONT><BR>
<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><BR>
<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><BR>
<FONT face="Times New Roman" size=3> </FONT><BR>
<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><BR>
<FONT face="Times New Roman" size=3> </FONT><BR>
<FONT face="Times New Roman" size=3>Thank you</FONT><BR>
<FONT face="Times New Roman" size=3></FONT> <BR>
<FONT face="Times New Roman" size=3>Ana</FONT><BR>
<FONT face="Times New Roman" size=3> </FONT><BR></DIV><BR>_______________________________________________<BR>Equest-users mailing list<BR><A href="http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org" target=_blank>http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org</A><BR>To unsubscribe from this mailing list send a blank message to <A href="mailto:EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG">EQUEST-USERS-UNSUBSCRIBE@ONEBUILDING.ORG</A><BR><BR></BLOCKQUOTE></DIV><BR><BR clear=all><BR>-- <BR>Carol Gardner PE<BR>
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