<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
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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,<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'>The relationship between SEER and EER is going to vary from system to system and does not depend on the climate. Take a look at the AHRI certified product database:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><a href="http://www.ahridirectory.org/ahridirectory/pages/home.aspx">http://www.ahridirectory.org/ahridirectory/pages/home.aspx</a><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>They report both SEER and EER for all air conditioners and heat pumps that have been tested. There is no way to convert directly between SEER and EER (or HSPF and COP) without having the results from the all of the AHRI tests which are usually kept confidential. The approximation of 0.875 accounts for part load cycling losses, but also how the system performs at other test conditions. It is probably a fair assumption, though you might want to check out the Building America House Simulation Protocol which uses:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>EER = -0.02*SEER^2 + 1.12*SEER<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'>This is based on a thesis written by a student at University of Colorado. The same thesis used:<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'>COP_47 = -0.026*HSPF^2 + 0.624*HSPF<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'>Here is the reference for the thesis:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.5pt'>Wassmer, M. (2003). A Component-Based Model for Residential Air Conditioner and Heat Pump Energy Calculations. Masters Thesis, University of Colorado at Boulder.</span><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'>Hope this helps,<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='font-size:14.0pt;color:#1F497D'>Neal Kruis<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Electricity, Resources & Building Systems Integration<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>National Renewable Energy Laboratory<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>1617 Cole Blvd. MS 5202<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>Golden, CO 80401<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>(303) 384-7384<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"'> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Nick Caton<br><b>Sent:</b> Tuesday, March 08, 2011 12:36 PM<br><b>To:</b> bldg-sim@lists.onebuilding.org<br><b>Subject:</b> [Bldg-sim] Fundamentals: SEER/HSPF conversions<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I understand HSPF is fundamentally the same thing as SEER, only it’s representing a heating season instead of a cooling season.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>When handling SEER, I used the following equation to come up with a seasonally averaged cooling EER:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>EER = SEER * 0.875<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My limited understanding is that 0.875 is a conceptually a constant representing a “part load cycling factor” of sorts for a typical cooling season. I’ve read multiple times this constant should vary with climate (commonly, “Georgia = 0.8” and “California = 0.9”). While that makes sense to me, I’ve yet to see a citable climate map or similar reference breaking down what factor to use where… so up to this point I’ve stuck with 0.875 for simplicity’s sake.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My root question is: Is there a comparable “part load cycling factor,” for one or more climates, for converting HSPF to a seasonally averaged heating COP/EER?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Put another way: EER = HSPF * <u>???</u><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>~Nick<o:p></o:p></p><p class=MsoNormal><img border=0 width=119 height=37 id="Picture_x0020_1" src="cid:image001.jpg@01CBDD8E.636AF6C0" alt="cid:489575314@22072009-0ABB"><b><span style='font-family:"Stylus BT";color:#2D4D5E'><o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Stylus BT";color:#2D4D5E'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Stylus BT";color:#2D4D5E'>NICK CATON, E.I.T.</span></b><b><span style='font-size:12.0pt;font-family:"Stylus BT";color:#2D4D5E'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;color:#CC9900'>PROJECT ENGINEER<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<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><p class=MsoNormal><o:p> </o:p></p></div></body></html>