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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>If you set up a heating equipment control with all the boilers with the same sequence priority (probably 1) then they will all fire simultaneously and ramp down to handle the load.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Bishop, Bill<br><b>Sent:</b> Thursday, February 21, 2013 10:27 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] Boiler HEAT-EQUIP-CTRL for accurate part-load performance<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US>I have been experimenting with Equipment Control on a hot water loop to try to maximize the benefit of multiple condensing boilers, but I can’t seem to reduce gas consumption below that using no equipment control (and for most of my experiments it actually increases). Condensing boilers are most efficient at part load. Obviously the first things to do to accurately capture the energy savings potential of condensing boilers (after setting BOILER:TYPE to “Condensing…” is to enter the following values:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>BOILER:CAPACITY<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>BOILER:HEAT-INPUT-RATIO<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>BOILER:MIN-RATIO (a 20:1 turndown would be .05)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>HW loop DESIGN-HEAT-T<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>HW loop LOOP-DESIGN-DT<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>HW loop HEAT-SETPT-CTRL to “OA Reset” with assigned HEAT-RESET-SCH<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>HW loop LOOP-OPERATION to “Demand” (if appropriate)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Is there a way to use Equipment Control to keep multiple boilers at part load while minimizing cycling losses from BOILER:START-UP-TIME and STANDBY-TIME, or does eQUEST stage the boilers efficiently automatically?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I have observed multiple old, large HW and steam boilers on a single loop running simultaneously when one boiler could clearly satisfy the load. Can anyone suggest a HEAT-EQUIP-CTRL to represent this? Does anyone have different START-UP-TIMEs or STANDBY-TIMEs suggestions based on field observations? Anyone know of any white papers or IBPSA presentations on the topic?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Bill<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><a href="mailto:wbishop@pathfinder-ea.com"><span style='text-decoration:none'><img border=0 width=480 height=114 id="Picture_x0020_1" src="cid:image001.jpg@01CE106C.8F9A4E90" alt="Senior Energy Engineer 28Jun2012"></span></a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></body></html>