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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'>Nick and Christian,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>The 90.1 prescriptive performance values for unitary equipment are based on ARI rated conditions. The 90.1 baseline fan power allowance does not directly align with the fan energy used in the ARI test. The fan energy in the ARI test is based on 365 W/1000 CFM and 400 CFM/12000 Btu/h. I believe you should use your baseline system equipment capacity (Btu/h or KW) to calculate the amount of fan energy to ‘extract’ from the cooling equipment EER/SEER/COP rather than the 90.1 baseline fan power allowance as indicated below in step 4. If you use the 90.1 baseline fan power allowance, you could be removing a larger fan power value, making the cooling equipment more efficient in the baseline than the tested performance requires.<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'>Also, the ARI tests are based on specific temperature conditions so you may need to adjust for project specific design conditions.<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'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Bill<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'><o:p> </o:p></span></p><table class=MsoNormalTable border=0 cellpadding=0 width=474 style='width:355.5pt'><tr><td width=167 valign=top style='width:125.25pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt;color:#660000;text-transform:uppercase'>Bill Talbert</span></b><b><span style='font-size:9.0pt;color:#333333'> </span></b><span style='font-size:9.0pt;color:#333333'>PE, LEED® AP<br></span><span style='font-size:10.0pt;color:#333333;text-transform:uppercase'>Sustainable</span><span style='font-size:9.0pt;color:#333333'><o:p></o:p></span></p></td><td width=10 valign=top style='width:7.5pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal><span style='font-size:9.0pt;color:#333333'> <o:p></o:p></span></p></td><td width=283 valign=top style='width:212.25pt;padding:.75pt .75pt .75pt .75pt'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:9.0pt;color:#660000'>AEI</span></b><span style='font-size:9.0pt;color:#333333'> | AFFILIATED ENGINEERS, INC. <br>5802 Research Park Boulevard | Madison, WI 53719<br><br></span><span style='font-size:9.0pt;color:#660000'>P: 608.441.6677 | C: 608.234.3803 | F: 608.238.2614</span><span style='font-size:9.0pt;color:#333333'> <br></span><a href="mailto:btalbert@aeieng.com"><span style='font-size:9.0pt;color:#660000;text-decoration:none'>btalbert@aeieng.com</span></a><span style='font-size:9.0pt;color:#660000'> | </span><a href="http://www.aeieng.com/"><b><span style='font-size:9.0pt;color:#660000;text-decoration:none'>www.aeieng.com</span></b></a><span style='font-size:9.0pt;color:#333333'> <o:p></o:p></span></p></td></tr></table><p class=MsoNormal><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'><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'><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"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Nick Caton<br><b>Sent:</b> Monday, July 11, 2011 9:52 AM<br><b>To:</b> Christian Kaltreider; equest-users@lists.onebuilding.org<br><b>Subject:</b> Re: [Equest-users] Separating Fan Energy from EER<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Hi Christian,<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'>USGBC/LEED/90.1 does not officially sanction or require any eQuest-specific procedure (nor any other program), so ultimately it falls on the modelers to know what the heck we’re doing and be able to defend it in cases like this. <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'>As a qualifier, not all efficiency ratings are fan-energy-inclusive. For those that are, the procedure I follow (using a spreadsheet) is to basically:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='color:#1F497D'><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>Using the maximum design capacity, translate the prescribed/scheduled efficiency from SEER/EER to kW input at maximum capacity. You may have noticed there’s more than one SEER equation out there… For seasonal efficiencies (SEER/AFUE), there are various formulae for conversion to steady-state efficiencies (EER/COP) that vary based on what kind of equipment you’re dealing with. You’ll also find that certain equipment like heatpumps have multiple equations referenced, as there are multiple white papers published over the decades that attempt to establish a relationship between nominal seasonal efficiency and steady-state efficiency, where each study sampled different equipment from a different period of time. What does this mean for today’s LEED modeler? <u>There are multiple right answers</u> (provided you know where you’re coming from). To give a more concrete response on this point, here are the equations I have collected and currently use for baseline system seasonal efficiencies (with references):<o:p></o:p></span></p><p class=MsoListParagraph><span style='color:#1F497D'><o:p> </o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=919 style='width:689.25pt;margin-left:-.75pt;border-collapse:collapse'><tr style='height:15.0pt'><td width=271 nowrap valign=bottom style='width:203.25pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='color:black'>EER=f(SEER):<o:p></o:p></span></b></p></td><td width=648 nowrap valign=bottom style='width:6.75in;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><i><u><a href="http://apps1.eere.energy.gov/buildings/publications/pdfs/%20building_america/house_simulation_revised.pdf"><span style='color:windowtext'>[Reference: NREL Building America House Simulation Protocol (Revised), citing Wassmer, M. (2003). A Component-Based Model for Residential Air Conditioner and Heat Pump Energy Calculations.]</span></a><o:p></o:p></u></i></p></td></tr><tr style='height:15.0pt'><td width=271 nowrap valign=bottom style='width:203.25pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>(AC) (Baseline Systems #1, #3, #5 & #6):<o:p></o:p></span></p></td><td width=648 nowrap valign=bottom style='width:6.75in;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:#0070C0'>EER</span><span style='font-size:8.0pt;color:#0070C0'>NET</span><span style='color:#0070C0'> = -0.0182*SEER^2 + 1.1088*SEER<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=271 nowrap valign=bottom style='width:203.25pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>(HP-cooling) (Baseline Systems #2 & #4):<o:p></o:p></span></p></td><td width=648 nowrap valign=bottom style='width:6.75in;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:#0070C0'>EER</span><span style='font-size:8.0pt;color:#0070C0'>NET</span><span style='color:#0070C0'> = -0.02*SEER^2 + 1.1268*SEER<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=271 nowrap valign=bottom style='width:203.25pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td><td width=648 nowrap valign=bottom style='width:6.75in;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td></tr><tr style='height:15.0pt'><td width=271 nowrap valign=bottom style='width:203.25pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='color:black'>COP=f(HSPF):<o:p></o:p></span></b></p></td><td width=648 nowrap valign=bottom style='width:6.75in;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><i><u>[Reference: Wassmer, M. (2003). A Component-Based Model for Residential Air Conditioner and Heat Pump Energy Calculations. Masters Thesis, University of Colorado at Boulder.]<o:p></o:p></u></i></p></td></tr><tr style='height:15.0pt'><td width=271 nowrap valign=bottom style='width:203.25pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>(HP-heating) (Baseline Systems #2 & #4):<o:p></o:p></span></p></td><td width=648 nowrap valign=bottom style='width:6.75in;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:red'>COP</span><span style='font-size:8.0pt;color:red'>NET</span><span style='color:red'> = -0.0255*HSPF^2 + 0.6239*HSPF<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=271 nowrap valign=bottom style='width:203.25pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td><td width=648 nowrap valign=bottom style='width:6.75in;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'></td></tr><tr style='height:15.0pt'><td width=271 nowrap valign=bottom style='width:203.25pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='color:black'>HIR = f(AFUE):<o:p></o:p></span></b></p></td><td width=648 nowrap valign=bottom style='width:6.75in;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><i><u>[Reference: California Energy Commission's 2005 "Nonresidential Alternative Calculation Method (ACM) Approval Manual"]<o:p></o:p></u></i></p></td></tr><tr style='height:15.0pt'><td width=271 nowrap valign=bottom style='width:203.25pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>For single packaged central furnace (baseline system #3):<o:p></o:p></span></p></td><td width=648 nowrap valign=bottom style='width:6.75in;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:#00B050'>HIR = (.005163*AFUE+0.4033)^-1<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=271 nowrap valign=bottom style='width:203.25pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>For Boilers where 75 ˜ AFUE < 80 (Baseline systems #1, #5 ):<o:p></o:p></span></p></td><td width=648 nowrap valign=bottom style='width:6.75in;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:#00B050'>HIR = (0.1*AFUE+72.5)^-1*100<o:p></o:p></span></p></td></tr><tr style='height:15.0pt'><td width=271 nowrap valign=bottom style='width:203.25pt;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal align=right style='text-align:right'><span style='color:black'>For Boilers where 80 ˜ AFUE < 100 (Baseline systems #1, #5 ):<o:p></o:p></span></p></td><td width=648 nowrap valign=bottom style='width:6.75in;padding:0in 5.4pt 0in 5.4pt;height:15.0pt'><p class=MsoNormal><span style='color:#00B050'>HIR = (0.875*AFUE+10.5)^-1*100<o:p></o:p></span></p></td></tr></table><p class=MsoListParagraph><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>*Note: The cited references above are freely accessible on the internet, last time I checked. If anyone has a “better” equation to suggest, (knowing where the equation came from), please share! <o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='color:#1F497D'><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>For baseline systems, calculate the system fan energy Pfan. For proposed systems, calculate the actual system fan energy in kW.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='color:#1F497D'><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>Using the system fan design airflow(s), enter the calculated fan energy as kW/CFM under airside systems tab.<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='color:#1F497D'><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='color:#1F497D'>Subtract #2 from the cooling “kW input” in #1 – this is the “other-than-fan energy.” Using the design cooling capacity for the system, turn that into an EIR figure for input in the model.<o:p></o:p></span></p><p class=MsoListParagraph><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Those who make the effort to understand what’s happening have the right idea. Relying on others’ work and tools without fundamental understanding on occasion is necessary, but it’s a slippery slope to be sure. <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'>Best of luck to you!<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'>~Nick<o:p></o:p></span></p><div><p class=MsoNormal><span style='color:#1F497D'><img border=0 width=119 height=37 id="Picture_x0020_1" src="cid:image001.jpg@01CC3FB9.54A6A9D0" alt="cid:489575314@22072009-0ABB"></span><b><span style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Stylus BT","sans-serif";color:#2D4D5E'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:12.0pt;font-family:"Stylus BT","sans-serif";color:#2D4D5E'>NICK CATON, P.E.<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>SENIOR ENGINEER<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>Smith & Boucher Engineers</span><span style='font-size:7.5pt;font-family:"Times New Roman","serif";color:#CC9900'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>25501 west valley parkway, suite 200<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>olathe, ks 66061<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>direct 913.344.0036<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;color:#2D4D5E'>fax 913.345.0617<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="www.smithboucher.com" title="blocked::www.smithboucher.com"><span style='font-size:10.0pt'>www.smithboucher.com</span></a></span><u><span style='font-size:10.0pt;color:blue'> </span></u><span style='color:#1F497D'><o:p></o:p></span></p></div><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 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-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Christian Kaltreider<br><b>Sent:</b> Monday, July 11, 2011 7:43 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] Separating Fan Energy from EER<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>Hi All,</span><o:p></o:p></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>There are strings about this subject in the archives, but they do not fully answer my questions and I am not able to open some of the key attachments. Here is my question: Is there a LEED-accepted method for separating out fan energy from an EER? I am looking for how this can be done without eQUEST doing some behind-the-scenes calculations/assumptions. There is an equation that was given in a former string, but I don’t know its source or whether it is an accepted method by the reviewing committee. Again, I am looking to be able to show how this is done by hand…not how to get eQUEST to do it for me.<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 very much for your help,<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Christian<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'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Christian Kaltreider, LEED AP<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Energy Engineer<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Sud Associates, PA<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>(828) 255-4691<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><a href="mailto:ckaltreider@sudassociates.com">ckaltreider@sudassociates.com</a><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'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p></div></body></html>