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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-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Karen, <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Since minimum cooling efficiencies in ASHRAE Section 6 are given for ARI rating conditions, we need to use fan power at ARI rating conditions to calculate the baseline EIR. You can get fan power at rating conditions for different types of systems from AHRI website, or simply trust the attached document that is included in eQUEST documentation. After calculate EIR for the baseline, I use G3.1.2.9 to determine the fan power. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Maria <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><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>Karen Walkerman<br><b>Sent:</b> Monday, January 31, 2011 5:55 PM<br><b>To:</b> Sam Mason; bldg-sim@lists.onebuilding.org<br><b>Subject:</b> Re: [Bldg-sim] ASHRAE Appendix G EER Calculation<o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Hi Sam,<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I guess my question is the definition of "packaged" for the baseline system case. Systems 1 and 2 are very clearly packaged systems, with relatively low fan power. The fan power calculation reflects this, with much lower fan powers for these systems. However, systems 5 and 6 are called "packaged" systems, but these systems typically serve a large portion of a building with more extensive ductwork and higher fan powers (reflected in the fan power calculation), subtracting out fan powers from these systems and manipulating the EER of these systems results in very high EERs (upwards of 18???). <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>It is unclear to me which air conditioners listed in section 6.8 have a rating which includes fan power and which do not. I am assuming that where different "single package" and "split system" EERs are given, that the first includes fan energy while the second does not.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Anyway, it seems that to model baseline systems, the simplest approach is to choose the split system EER (if listed) in section 6.8, and calculate the fan power according to the G3.1.2.9 guidelines. Therefore, the only time you would have to do the calculation mentioned by Sam is for a proposed design system where the fan energy is included in the EER.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>--<o:p></o:p></p></div><div><p class=MsoNormal>Karen<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Mon, Jan 31, 2011 at 5:30 PM, Sam Mason <<a href="mailto:sam.mason@atelierten.com">sam.mason@atelierten.com</a>> wrote:<o:p></o:p></p><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>Karen,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>From the user’s guide, the fan power should be removed from the standard EER rating of packaged cooling systems. Excerpt below but let me know if you have any further questions.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>A 15-ton packaged rooftop single-zone system having an </span><i><span style='font-size:10.0pt'>EER </span></i><span style='font-size:10.0pt;font-family:"Garamond","serif"'>of 8.6 (</span><i><span style='font-size:10.0pt'>COP </span></i><span style='font-size:10.0pt;font-family:"Garamond","serif"'>of 2.5) is</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>specified for a building. The following table gives the design specifications. How should</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>this be modeled?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:8.0pt;font-family:"Garamond","serif"'>Equipment parameter Value</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:8.0pt;font-family:"Garamond","serif"'>Net Cooling Capacity (Btu/h) 174,000</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:8.0pt;font-family:"Garamond","serif"'>Total Packaged Unit Input Power (W) 20,128</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><i><span style='font-size:8.0pt'>EER </span></i><span style='font-size:8.0pt;font-family:"Garamond","serif"'>8.64</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:8.0pt;font-family:"Garamond","serif"'>Gross Cooling Cap (ARI conditions) 182,000</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><b><span style='font-size:18.0pt'>A</span></b><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>The supply fan power is the difference between the gross and the net cooling capacity.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:TimesNewRoman'>Supply Fan Power = (182,000 - 174,000 Btu / h) / 3.413 Btu /W h = </span><span style='font-size:16.0pt;font-family:Symbol'> </span><span style='font-size:10.0pt;font-family:TimesNewRoman'>2343 W</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:Symbol'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>From the equation for cooling system </span><i><span style='font-size:10.0pt'>COP</span></i><span style='font-size:10.0pt;font-family:"Garamond","serif"'>, the cooling provided by the compressor and</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>the condenser into the airstream in Btu/h per Btu/h of electrical power input is:</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:TimesNewRoman'>COP = (182,000 Btu / h) / {(20,128 - 2343 W)* 3.413 Btu / W h } = 3.0</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>Some simulation programs use an energy input ratio (</span><i><span style='font-size:10.0pt'>EIR</span></i><span style='font-size:10.0pt;font-family:"Garamond","serif"'>), which is 1/</span><i><span style='font-size:10.0pt'>COP</span></i><span style='font-size:10.0pt;font-family:"Garamond","serif"'>. In this case,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>the </span><i><span style='font-size:10.0pt'>EIR </span></i><span style='font-size:10.0pt;font-family:"Garamond","serif"'>for this piece of equipment would be 1/3 or 0.333.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'>--</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'>Sam Mason</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:10.5pt;font-family:Consolas;color:#1F497D'>Atelier Ten</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'>T +1 212 254 4500 x221</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;color:#1F497D'> </span><o:p></o:p></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><b><span style='font-size:10.0pt'>From:</span></b><span style='font-size:10.0pt'> <a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a> [mailto:<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" target="_blank">bldg-sim-bounces@lists.onebuilding.org</a>] <b>On Behalf Of </b>Karen Walkerman<br><b>Sent:</b> Monday, January 31, 2011 3:53 PM<br><b>To:</b> <a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a><br><b>Subject:</b> Re: [Bldg-sim] ASHRAE Appendix G EER Calculation</span><o:p></o:p></p></div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>A clarification:<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>My question pertains to baseline models, with baseline systems.<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>--<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Karen<o:p></o:p></p></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>On Mon, Jan 31, 2011 at 12:09 PM, Karen Walkerman <<a href="mailto:kwalkerman@gmail.com" target="_blank">kwalkerman@gmail.com</a>> wrote:<o:p></o:p></p><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Hi All,<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>G3.1.2.1 in ASHRAE 90.1 says that "Where efficiency ratings, such as EER and COP, include fan energy, the descriptor shall be broken down into its components so that supply fan energy can be modeled separately."<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>However, I am a little unclear as to which baseline systems this applies to. It seems that it would apply to systems 1 - 2, and not to systems 3 - 8?<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Thanks,<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>--<o:p></o:p></p></div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'>Karen<o:p></o:p></p></div></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'> <o:p></o:p></p></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>