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<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">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.<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" style="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;font-family:"Garamond,Italic","serif"">EER
</span></i><span style="font-size:10.0pt;font-family:"Garamond","serif"">of 8.6 (</span><i><span style="font-size:10.0pt;font-family:"Garamond,Italic","serif"">COP
</span></i><span style="font-size:10.0pt;font-family:"Garamond","serif"">of 2.5) is<o:p></o:p></span></p>
<p class="MsoNormal" style="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<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"Garamond","serif"">this be modeled?<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:8.0pt;font-family:"Garamond","serif"">Equipment parameter Value<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:8.0pt;font-family:"Garamond","serif"">Net Cooling Capacity (Btu/h) 174,000<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:8.0pt;font-family:"Garamond","serif"">Total Packaged Unit Input Power (W) 20,128<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><i><span style="font-size:8.0pt;font-family:"Garamond,Italic","serif"">EER
</span></i><span style="font-size:8.0pt;font-family:"Garamond","serif"">8.64<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:8.0pt;font-family:"Garamond","serif"">Gross Cooling Cap (ARI conditions) 182,000<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><b><span style="font-size:18.0pt;font-family:"Garamond,Bold","serif"">A<o:p></o:p></span></b></p>
<p class="MsoNormal" style="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.<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"TimesNewRoman","serif"">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","serif"">2343 W<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:Symbol"><o:p> </o:p></span></p>
<p class="MsoNormal" style="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;font-family:"Garamond,Italic","serif"">COP</span></i><span style="font-size:10.0pt;font-family:"Garamond","serif"">, the cooling provided by the compressor and<o:p></o:p></span></p>
<p class="MsoNormal" style="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:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:10.0pt;font-family:"TimesNewRoman","serif"">COP = (182,000 Btu / h) / {(20,128 - 2343 W)* 3.413 Btu / W h } = 3.0<o:p></o:p></span></p>
<p class="MsoNormal" style="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;font-family:"Garamond,Italic","serif"">EIR</span></i><span style="font-size:10.0pt;font-family:"Garamond","serif"">),
which is 1/</span><i><span style="font-size:10.0pt;font-family:"Garamond,Italic","serif"">COP</span></i><span style="font-size:10.0pt;font-family:"Garamond","serif"">. In this case,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Garamond","serif"">the
</span><i><span style="font-size:10.0pt;font-family:"Garamond,Italic","serif"">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><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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas;color:#1F497D">--<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas;color:#1F497D">Sam Mason<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas;color:#1F497D">Atelier Ten<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">T +1 212 254 4500 x221<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>
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<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 3:53 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] ASHRAE Appendix G EER Calculation<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">A clarification:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">My question pertains to baseline models, with baseline systems.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">--<o:p></o:p></p>
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<p class="MsoNormal">Karen<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Jan 31, 2011 at 12:09 PM, Karen Walkerman <<a href="mailto:kwalkerman@gmail.com">kwalkerman@gmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi All,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">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>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">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>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">--<o:p></o:p></p>
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<p class="MsoNormal">Karen<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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