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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Good Afternoon!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">I’m working on a building with a water-source heat pump system. The designers want to use an adjacent river as a heat source/sink, but they want to include a backup boiler as
the river regularly freezes in the winter. The boiler would preheat water from the river intake before it gets distributed to the heat pump evaporators. I started this project in eQuest 3.65, since it can model hybrid systems. However, even though I can attach
the boiler to the water-loop heat pump loop along with the river heat source, when I run a simulation the boiler never comes on. I’ve tried adding an equipment control and load management scheme to the loop (admittedly, I’m a novice when it comes to that area
of eQuest), but that just makes the simulation crash. I’ve attached the project files if anyone want to take a look. Is there a way to control the backup boiler so that it comes on above a certain heating load, or when the river water dips below a certain
temperature?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Thanks,<br>
Drew<o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:120%;text-autospace:none"><b><span style="font-size:9.0pt;line-height:120%;font-family:"Arial",sans-serif;color:black">Drew Morrison</span></b><span style="font-size:9.0pt;line-height:120%;font-family:"Arial",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="line-height:120%;text-autospace:none"><span style="font-size:9.0pt;line-height:120%;font-family:"Arial",sans-serif;color:black">Energy Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">he/him/his<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial",sans-serif">608.210.7151<o:p></o:p></span></p>
<p class="MsoNormal"><a href="dmorrison@slipstreaminc.org"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0563C1">dmorrison@slipstreaminc.org</span></a><span style="font-size:9.0pt;font-family:"Arial",sans-serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt"><img border="0" width="144" height="22" style="width:1.5in;height:.2333in" id="Picture_x0020_8" src="cid:image001.jpg@01D8E7B1.750D6770" alt="A picture containing drawing
Description automatically generated"></span><o:p></o:p></p>
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