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<p class="MsoNormal"><span style="color:#1F497D">I’ve always thought that this was an error in table G3.1.3.7 in the SI version but I don’t know if it was fixed. In the IP version of 90.1 if your building cooling load is over 600 Tons, you should use “ 2 water
cooled chillers minimum with chillers added so that no chiller is larger than 800 Tons, all sized equally”. Notice that the SI table column header says “Building Peak Cooling Load” but then lists areas. Maybe there is a reason for it that I don’t know but
it seems incorrect to me. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">Brendan Hall, PE, LEED AP </span>
<span style="font-size:8.0pt;color:black">BD+C</span><span style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black">Engineer, Mechanical<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:13.5pt;font-family:"Arial","sans-serif";color:red">karpinski<br>
</span><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#1F497D">ENGINEERING</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D"><br>
3135 Euclid Avenue<br>
Cleveland, OH 44115<br>
</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red">P</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D">
<a href="tel:216.391.3700" target="_blank">216.391.3700</a> Ext 3111<br>
</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red">E</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:navy">
</span><u><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><a href="mailto:bhall@karpinskieng.com" target="_blank" title="mailto:myuhasz@karpinskieng.com">bhall@karpinskieng.com</a></span></u><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><br>
</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:red">W
</span><u><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue">www.<a href="http://www.karpinskieng.com/" target="_blank" title="http://www.karpinskieng.com/">karpinskieng.com</a></span></u><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="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""> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org]
<b>On Behalf Of </b>Rakesh Desai<br>
<b>Sent:</b> Thursday, October 17, 2013 8:58 AM<br>
<b>To:</b> equest-users@lists.onebuilding.org<br>
<b>Subject:</b> [Equest-users] Table G 3.1.3.7<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Arial","sans-serif"">Dear All,<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="margin-left:27.0pt;text-indent:-27.0pt;mso-list:l0 level2 lfo2;text-autospace:none">
<![if !supportLists]><span style="font-size:11.0pt"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">I had submitted energy model for certification and have received following reply:<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:27.0pt;text-autospace:none"><b><i><span style="font-family:"Arial","sans-serif"">As per table G3.1.3.7, ASHRAE 90.1.2007, “as chiller auto size capacity is more than 600 tons, centrifugal chiller should be considered”.
<o:p></o:p></span></i></b></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:27.0pt"><span style="font-family:"Arial","sans-serif"">My building conditioned area is < 22296 m<sup>2</sup> and as per model my chiller capacity is more than 600 TR and I have to use 2 chillers. I have modeled 2 nos.
screw chillers of equal capacity (auto size mode) with 5.5 COP.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:27.0pt"><span style="font-family:"Arial","sans-serif"">I checked the table and no where it is written that we need to model centrifugal chillers.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:27.0pt"><span style="font-family:"Arial","sans-serif"">Can someone help me to understand where I went wrong?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="margin-left:27.0pt;text-indent:-27.0pt;mso-list:l0 level2 lfo2;text-autospace:none">
<![if !supportLists]><span style="font-size:11.0pt"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">I had submitted PS E report of all rotations of base case and have received following reply:
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:27.0pt;text-autospace:none"><b><i><span style="font-family:"Arial","sans-serif"">Peak demand (946.52kW) reported for cooling is not matching with chiller input (For 2*613 TR and 5.5 COP, 783kW). So cooling savings in
not justified. <o:p></o:p></span></i></b></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:27.0pt;text-autospace:none"><span style="font-family:"Arial","sans-serif"">As per first submittal comment, I had changed my chiller to auto size mode and the chiller capacity is selected by model and not by me. Now, I
have received above comment. What is the way out?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial","sans-serif"">Rakesh Desai<o:p></o:p></span></p>
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