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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'>Ian,<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'>Equest thermal inputs use the convention of Mbtu = million btus, while common usage in the US is still generally Roman numerals with btus: mbtu = thousand btus, mmbtu = million btus. You should be entering 2.603 Mbtu for the boiler capacity in equest.<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'>However, I’d recommend looking at load hours not met in the BEPS report before and after entering that value. If the usage is going up when you enter the 2603 Mbtu value, that may mean something else is going on. Do teachers and staff report problems maintaining temperature in the winter, or does the boiler spend a lot of time in winter running? Is it possible the existing boiler is undersized, or is there something else going on?<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'>For the elementary gas consumption, it looks like you have a pilotless domestic water heater set up in the model. Are you sure that there’s no pilot on the domestic water heater or the boiler? Do they completely shut the boiler off during the summer? <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>How is the domestic hot water recirc pump controlled? If it does not have a timeclock or temperature control to shut it off when there’s no system demand, it may be causing the domestic water heater to cycle more frequently during the summer when there’s no load, especially if the HW & HWR piping is not adequately insulated. If this is the case, you can do a side calculation to estimate the HW & HWR piping UA and enter that in the domestic water loop as a SUPPLY-UA to get a closer match in your baseline.<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'>Thanks,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Steven<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 #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b>From:</b> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Ian Hadden<br><b>Sent:</b> Wednesday, September 11, 2013 6:22 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] Models for energy audits<o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I’ve been working on a couple models for an energy audit project and am coming up a bit stumped for issues with both buildings. I’d appreciate any insight folks can provide.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Attached are 2 zip files with the .pd2 and .inp files for each project as well as the utility analysis spreadsheets for each project. Year 1 in the spreadsheet is the output from the energy model for comparison to the actual utility bills (2.5 years of bills). Here are my primary issues for each project.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Carterville Intermediate<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>The winter electric use is greater than the modeled values while the summer is much higher. The shape of the curve is about right but the values are off. I think the winter electric is low because I’m not sure we’re seeing fan energy associated with heating. The system is DX coil unit vents (condensers on the roof) with hot water coils for spaces and HW radiators in the halls. Gym is heating only. I think the cooling electric is high because I think the teachers turn off the units because of noise and they open windows. The District reports they open corridor entry doors for airflow and teachers are supposed to keep classroom doors closed. Do I have the HVAC system configured correctly for the installed system? What can we do to adjust operation of the UVs in cooling?<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>I haven’t entered a value for the size of the boiler. eQuest has input in MBH and my photos show the label at 2603 MBH but that increases gas use by a factor of 100. Am I mixing up units here?<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>I haven’t figured out how to do anything for exhaust fans.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Carterville TriC Elementary<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>The peak summer electric demand is higher than actual but the kWH curve is a good fit to actual but just needs more hours. The HVAC system is ground source heat pumps per space with 6-7 ERVs (wheel only no mechanical cooling/heating) feeding OA to the return air inlet. There is one ERV for a 4 room addition that also has an electric heater in addition to the wheel. There is no supplemental boiler for the condenser loop. We haven’t been able to learn any data on the actual geology of the site but by plans we have the correct number of wells in our grid. I think the high demand means we need a larger well field to keep condenser water temps down and compressor load down but I may be missing something. It might also be tied to increase OA load. I’ve tried but am just not comfortable with my efforts to set up the ERVs in the system to temper the OA before the GSHPs.<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>When I go into Detailed edit it appears that my heat pumps all become equipped with VFD supply fans. This concerns me that I’ve really screwed up something in the HVAC system set up. <o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>Gas consumption is driving me nuts. The shape of the curve is a great match but their summer consumption is 4 times the modeled value. The only gas loads I have in the building are the DHW and the kitchen and they’ve told me the kitchen is closed during the summer. I’m a little concerned by the up/down nature of the model curve. With DWH and kitchen only the loads should be pretty smooth shouldn’t they?<o:p></o:p></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span><![endif]>The majority of the classroom wings have pitched metal roofs. I’ve walked through my selections with Mark and Cliff but I’m not sure we have accurately modeled the thermal performance of the roof for most of the building.<o:p></o:p></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><b><span style='font-family:"Arial","sans-serif"'>Ian T. Hadden, PE, LEED AP BD+C</span></b><o:p></o:p></p><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Project Executive<o:p></o:p></span></i></p><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Energy/Sustainability Services Manager</span></i><o:p></o:p></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Fanning Howey</span></b><o:p></o:p></p><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>C: (919) 239-0190</span></i><o:p></o:p></p><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>email: </span></i><a href="mailto:ihadden@fhai.com"><i><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>ihadden@fhai.com</span></i></a><o:p></o:p></p><p class=MsoNormal><span style='font-size:18.0pt;font-family:Webdings;color:green'>P</span><b> <span style='color:green'>Please consider the environment before printing this e-mail</span></b><o:p></o:p></p><p class=MsoNormal><b><span style='font-family:"Arial","sans-serif"'><img border=0 width=128 height=61 id="Picture_x0020_1" src="cid:image001.jpg@01CEAEC8.BEF1C150" alt="AWD_POY2013sm"></span></b><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><pre>________________________________________________________________________________________<o:p></o:p></pre><pre>This message contains confidential information and is intended only for the individual or entity named. The use, disclosure, dissemination, distribution, or reproduction of this message by unintended recipients is not authorized and may be unlawful. Please notify the sender immediately by email if you have received this email by mistake and delete this email from your system. Fanning/Howey Associates, Inc. has taken reasonable precautions to see that no viruses are present in the electronic mail. Fanning/Howey Associates, Inc. accepts no liability for any damage caused by any virus transmitted by this email.<o:p></o:p></pre><pre><o:p> </o:p></pre></div></body></html>