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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">From the outside looking in and not knowing your design requirements, I would question why your indoor “Cooling” thermostat temperature setpoint is set at
71.6 F? That seems like a low and extremely precise cooling setpoint to design to? Also what is your throttling range of your thermostat? Designing to something so precise would mean that our throttling range would be zero, which is not realistic.
<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">Also take a look at your AHU setup? Is it blow through or draw through, essentially where does your fan heat get included in the load, before or after the
coil? If the system is draw through the cooling coil has to have a lower coil leaving air temperature to account for the added fan heat.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hope that helps.<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"><img width="119" height="37" id="Picture_x0020_1" src="cid:image001.jpg@01CF1780.9C6F5B30" alt="cid:image001.jpg@01CCA5C8.288E04E0"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-top:6.0pt"><b><span style="font-size:14.0pt;font-family:"Avenir 55";color:#2D4D5E">Steven C. Tobin Jr., P.E.<o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Avenir 55";color:#CC9900">PROJECT ENGINEER<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-top:12.0pt"><span style="font-size:11.0pt;font-family:"Avenir 55";color:#2D4D5E">25501 west valley parkway</span><span style="font-size:10.0pt;font-family:"Avenir 55";color:#2D4D5E"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Avenir 55";color:#2D4D5E">olathe ks 66061<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Avenir 55";color:#2D4D5E">direct 913 344.0061<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Avenir 55";color:#2D4D5E">fax 913 345.0617<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"><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""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Hala Jaber<br>
<b>Sent:</b> Wednesday, January 22, 2014 2:14 PM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Baseline Fan power calculation<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Hey eQuest users,<br>
I have a new challanging requirement in the appendix G section G3.1.2.8, its required the supply air-to room air cooling temperature difference is 20 degrees for each HVAC system. Now my question is how can i achieve this if my baseline is system 8 and the
chilled water leaving temperature is specified 44 F with return delta t=12,at the same time that in my design the indoor thermostat temp=71.6 F , and the supply cooling temp should be 51.6F, here when i set this value i got an error in eQuest stating that"
the cooling coil leaving temperatures must be at least 6 F higher than entering water temp" and when i set the cooling supply air temp below 55 F trying to achieve the 20 degree difference, i got this error.<br>
I hope if any one can help,who may face this in baseline model.<br>
Thanks.<o:p></o:p></p>
<p>Hala Jaber<br>
Sustainablity Design Engineer.<o:p></o:p></p>
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