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<P>Dear equest users, </P>
<P>I am currently modeling a 4-pipe fan coil system connected to a ground source heat pump. </P>
<P>I followed this approach to develop the water-side HVAC within equest </P>
<P>1. Create a 'chiller' of the type 'water-to-water heat pump'<BR>2. Create an independent circulation loop of the type 'lake/well'<BR>3. Create a ground loop heat exchanger of the type 'lake/well'<BR>4. Select as the chiller CW loop and GLHX circulation loop the<BR>independent loop you created - they should connect without errors<BR>5. Assign a custom temperature schedule for the lake/well ground loop<BR>in the screen that pops up when you double click the GLHX (read on)<BR>6. Make sure the default head/pump properties for the circulation loop<BR>and GLHX make sense for your system - adjust as necessary. (i.e. if it's a<BR>closed ground loop, there shouldn't be static head)<BR></P>
<P>as explained in this thread "loop to loop heatpump in equest"</P>
<P><A href="http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2009-July/001862.html">http://lists.onebuilding.org/htdig.cgi/equest-users-onebuilding.org/2009-July/001862.html</A></P>
<P>Instead of using a custom temperature schedule for the lake/well, I am considering a constant temperature all year around (15°C)</P>
<P>Does that assumption has significant impact on the modeling itself ?.</P>
<P>Also, by using a loop-to-loop heat pump, I am no able to change the heating EIR efficiency/curve. See schematic and image attached. </P>
<P>Do you have any idea how to change the heating EIR because it is grey out on my model. </P>
<P>Let me know if I am on the right track</P>
<P>Thanks, </P>
<P>Nicolas Mercier</P>
<P>Sustainability Consultant, LEED AP</P>
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