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<p class="MsoNormal">I’m sure this must have been asked before but I cannot find an answer in the archives – if there is one please point me to it.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have interpreted the requirements of 90.1, App. G to split the EER of cooling equipment with a supply fan into its components to model the fan energy separately as follows:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Say a space has a cooling load of 80,000Btu/h and the system is packaged single zone, EER – 11.2.<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Calculate airflow for 20°F temperature difference – 3708cfm<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Calculate fan bhp from Table G3.1.2.9 – 3.49bhp<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">4.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Calculate fan power as per G3.1.2.9 – 2972W<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">5.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Calculate gross input power from load and EER – 7143W<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">6.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Subtract 4 from 5 for compressor/condenser input power – 4171W<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">7.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Convert to EIR – 0.1779<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This appears to make sense from reading App. G but ends up with high fan power consumption and low space cooling loads. Am I wrong here?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-family:"Arial","sans-serif";color:#002060">Steven Burley<br>
<br>
</span></b><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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