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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Jason,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>I just had this issue. GBCI has not reviewed it yet, but my strategy was to average the two conditions. 180 with 130 degree return is a 50 degree delta-T. 150 with 130 degree is a 20 degree delta-T. I ran the simulation once with the boiler and plant at a 50 degree delta-T and ran it a second time with a 20 degree delta-T. Then I used the average values of the two runs. I left the system delta-T at 50 for both runs. The system delta-T did not seen to effect the simulation results.<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>A better approximation might be a weighted average using the ambient dry bulb in the TMY data to figure how many hours would be spent at each delta-T. Of course you’d want to exclude the hours when the system is not scheduled to operate. <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>When I emailed Carrier HAP support they said, “</span><b><span style='font-size:12.0pt;font-family:"Comic Sans MS";color:navy'>We cannot currently model Hot Water reset of boiler temperature in HAP 4.51. For purposes of LEED, you must write a narrative explaining that the program you are using for LEED does not have this capability.<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Comic Sans MS";color:navy'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Comic Sans MS";color:navy'>We do have Supply Air Temp reset on a hot water coil in an air system.<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Comic Sans MS";color:navy'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Comic Sans MS";color:navy'>Hot Water Boiler reset is on our list for a future version of HAP.</span></b><span style='color:#1F497D'>”<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Good luck. <o:p></o:p></span></p><p class=MsoNormal><b><span style='font-family:"Arial","sans-serif";color:#1F497D'> </span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'> </span></b><u><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><br></span></u><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'> <b>Reba Schaber</b> Mechanical Engineer, P.E.<br> LEED Accredited Professional<br><br></span><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 style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> hap-users-bounces@lists.onebuilding.org [mailto:hap-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Jason D. Plumpton<br><b>Sent:</b> Monday, July 25, 2011 12:54 PM<br><b>To:</b> hap-users@onebuilding.org<br><b>Subject:</b> [Hap-users] Boiler Hot Water Reset<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Hello,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Has anyone had any luck modeling HW reset in HAP 4.51? <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>90.1-2007 Appendix G calls for this type of control in G3.1.3.4, and I am assuming that there must be some way of modeling this reset control in HAP. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Any advice/help would be greatly appreciated.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thank You,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Jason D Plumpton, P.E. LEED-AP<o:p></o:p></span></p><p class=MsoNormal><b><i><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>M/E Engineering, P.C.<o:p></o:p></span></i></b></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><br>________________________________________________________________________<br>This Email has been scanned for all viruses by PAETEC's Hosted E-mail Security Services, utilizing MessageLabs proprietary SkyScan infrastructure. For more information on a proactive anti-virus service working around the clock, around the globe, visit http://www.paetec.com.<br>________________________________________________________________________<o:p></o:p></span></p><div class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><hr size=1 width="100%" noshade style='color:#ACA899' align=center></span></div><p class=avgcert>No virus found in this message.<br>Checked by AVG - <a href="http://www.avg.com">www.avg.com</a><br>Version: 10.0.1390 / Virus Database: 1518/3787 - Release Date: 07/25/11<o:p></o:p></p></div></body></html>