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<p class="MsoNormal">ASHRAE Standard 90.1, G3.1.3.12 requires cooling supply air temperature reset for Systems 5 through 8.<o:p></o:p></p>
<p class="MsoNormal">G3.1.3.14 requires “supply air temperature setpoint shall be constant at the design condition” for Systems 6 and 8.<o:p></o:p></p>
<p class="MsoNormal">How should we interpret this and model it in eQUEST (for Systems 6 and 8)?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If the “design condition” in G3.1.3.14 means “peak design flow rate”, I suggest the following cooling control settings:<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]> COOL-CONTROL = WARMEST<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]> COOL-MIN-RESET-T = 56 $ (assumes 76F cooling T-stat; 56F MIN-SUPPLY-T for 20F difference per G3.1.2.8)<o:p></o:p></p>
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<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]> RESET-PRIORITY = AIRFLOW-FIRST<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:.75in;text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]> COOL-MAX-RESET-T = 61 $ (5F reset per G3.1.3.12; assumes 76F cooling T-stat)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Using a RESET-PRIORITY of “TEMP-FIRST” resets the supply air temperature
<i>before</i> the airflow, which does not satisfy the G3.1.3.14 requirement.<o:p></o:p></p>
<p class="MsoNormal">Using a RESET-PRIORITY of “TEMP-FIRST” or “SIMULTANEOUS” does not satisfy the G3.1.3.12 requirement, since temperature is reset well before minimum cooling load conditions are reached.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Does anyone have an alternative/additional suggestion or interpretation?<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">Bill<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:black">William Bishop, PE, BEMP, BEAP, LEED AP
</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:#006600">|</span></b><b><span style="font-size:10.0pt;font-family:"Franklin Gothic Medium","sans-serif";color:black"> Pathfinder Engineers & Architects LLP<o:p></o:p></span></b></p>
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<p class="MsoNormal"><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:black">Senior Energy Engineer<o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#1F497D">T: (585) 325-6004
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