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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="color:#1f497d">Hi Kathryn,</span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><span style="color:#1f497d">I can’t answer without digging in myself, but I *think* if you follow along with the textual description of PLANT simulation in the DOE2 engineers manual (I’d attach, but don’t have my library handy atm – it’s out there in google!), leveraging your intimacy with the project-at-hand as a working example, you might come up with a better understanding of exactly what that “overload” figure is in isolation. There’s a bulleted list somewhere in there that explains the order in which various parts of your model are considered before the remaining loop loads (for any loop type) are labeled “overload.”</span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><span style="color:#1f497d">A separate shot in the dark from the hip: It may be possible the reason “net peak + overload peak =/= total peak” could have to do with one or more heatpumps on the loop operating in the reverse direction during the peak hour… maybe… or not… =)</span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><span style="color:#1f497d">~Nick</span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p><div><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#3a7a46">---------------------------------------------------------------------------------------------------------------------------------------------</span></p><p class="MsoNormal"><b><span style="font-family:"Arial","sans-serif";color:#3a7a46">Nick Caton, P.E.</span></b><span style="color:#3a7a46"></span></p><table class="MsoNormalTable" border="1" cellspacing="0" cellpadding="0" width="706" style="width:7.35in;border-collapse:collapse;border:none"><tr><td width="240" valign="top" style="width:2.5in;border:none;padding:0in 0in 0in 0in"><p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#626469"> Senior Energy Engineer</span><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1f497d"><br></span><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#626469"> Energy and Sustainability Services</span><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1f497d"><br></span><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#626469"> North America Operations</span><span 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consider the environment before printing this e-mail</span><span style="color:#3a7a46"></span></p></td></tr></table><p class="MsoNormal"><span style="color:#1f497d"> </span></p><p class="MsoNormal"><span style="color:#1f497d"> </span></p></div><p class="MsoNormal"><span style="color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Equest-users [mailto:<a href="mailto:equest-users-bounces@lists.onebuilding.org">equest-users-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Kathryn Kerns<br><b>Sent:</b> Friday, January 22, 2016 2:10 PM<br><b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br><b>Subject:</b> [Equest-users] WSHP System with PS-H Report Circulation Loop Overload</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal">Everyone, I made an energy model of a building being served by water source heat pumps attached to a typical water loop with a fluid cooler and a boiler. I let eQuest size all the equipment including the boiler and water source heat pumps. The PS-H Water Loop report showed the following:</p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal"><img border="0" width="969" height="502" id="Picture_x0020_1" src="cid:image004.png@01D15900.309A84C0"></p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal">Notice that in January, the peak heating load is -991.9 kbtu/hr, the peak net load is -576.1 kbtu/hr, and the peak over load is -355.6 kbtu/hr. eQuest sized the water loop boiler to be -576.1 kbtu/hr. I believe these numbers are correct and the boiler size is correct but I cannot find an explanation in a document telling me how net load and over load is calculated and what they mean. I can explain how eQuest develops the heat load, but not the other two loads. I know a typical hot water coil system has heat load peaks equal to net load peaks and the over loads are usually zero. I am pretty sure the over load value is related to the heat pump COP, but I would like to be able to point to a written piece of documentation explaining this. Anybody know where to look?</p><p class="MsoNormal"> </p><p class="MsoNormal">Thanks.</p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal">P.S. the energy model ran successfully with less than 10 heating hours out of throttling range. </p><p class="MsoNormal"> </p><p class="MsoNormal"> </p><p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Arial","sans-serif";color:black">Kathryn Kerns</span></b><span style="font-size:12.0pt;font-family:"Times New Roman","serif""></span></p><p class="MsoNormal"><b><span style="font-family:"Arial","sans-serif"">Systems Specialist</span></b><span style="font-size:12.0pt;font-family:"Times New Roman","serif""></span></p><p class="MsoNormal"><b><span style="font-size:12.0pt;font-family:"Times New Roman","serif";font-variant:small-caps;color:teal">BCE</span></b><b><span style="font-size:10.0pt;font-family:"Times New Roman","serif";font-variant:small-caps;color:teal"> </span></b><b><span style="font-size:12.0pt;font-family:"Times New Roman","serif";font-variant:small-caps;color:teal">Engineers, Inc.</span></b></p><p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Times New Roman","serif";color:black">| Ph: 253.922.0446 | Fx: 253.922.0896 |</span></b><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:black"> </span></p><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Arial","sans-serif";color:black"> </span></p><p class="MsoNormal"> </p></div></body></html>