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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='font-family:"Optima LT"'>Hi All,<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>I don’t mean to ask questions back to back days here, but I ran into roadblock. I found an equation for the compressor EIR to be:<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>Cooing EIR=(1/EER-0.012167)/(1/3.413-0.012167)<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>Has anyone tried to derive this, or know of a document that has done so? I seem to be missing something in my derivation as follows:<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-family:"Optima LT"'>EER=Cooling Output (Btuh)/(Supply Fan Input (W) + Compressor Input (W))<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-family:"Optima LT"'>1/EER=Supply Fan Input/Cooling Output + Compressor Input/Cooling Output<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l1 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-family:"Optima LT"'>Compressor Input/Cooling Output = 1/EER – Supply Fan Input/Cooling Output<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>At ARI condition supply fan is rated at 365W/CFM & 400CFM/Ton<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>So Supply Fan Input/Cooling Output = 0.146 kW/Ton or .012167 W/Btuh<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-family:"Optima LT"'>Compressor Input/Cooling Output = 1/EER - 0.012167<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-family:"Optima LT"'>Compressor Input/Cooling Output (Btu/Btu) = 3.413*(1/EER – 0.012167)<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>i.e.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>EER=11<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>Compressor EIR = 3.413*(1/11 – 0.012167) = 0.2687 (should be 0.2580)<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>Is there something that I am missing?<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'>Thank in advance,<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Optima LT"'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-family:"Optima LT";color:#1A2A6C'>Daniel Kaler<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-family:"Optima LT";color:#1A2A6C'>Energy Engineer, EIT<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:6.0pt;font-family:"Optima LT";color:#1A2A6C'><o:p> </o:p></span></b></p><div style='mso-element:para-border-div;border:none;border-top:double #002060 2.25pt;padding:1.0pt 0in 0in 0in'><p class=MsoNormal style='border:none;padding:0in'><b><span style='font-size:6.0pt;font-family:"Optima LT";color:#1A2A6C'><o:p> </o:p></span></b></p></div><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:12.0pt;font-family:"Optima LT";color:#1A2A6C'>MEP ASSOCIATES<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:10.0pt;font-family:"Optima LT";color:black'>engineers | consultants | commissioning<o:p></o:p></span></b></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:8.0pt;font-family:"Optima LT";color:black'>MEP Associates, LLC | 2720 Arbor Court | Eau Claire, WI 54701<o:p></o:p></span></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:8.0pt;font-family:"Optima LT";color:black'>Phone: 715.832.5680 | Fax: 715.832.5668 |www.mepassociates.com</span><span style='font-size:8.0pt;font-family:"Optima LT"'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>