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<p class="MsoNormal"><span style="font-family:"Franklin Gothic Book","sans-serif"">HI,
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Franklin Gothic Book","sans-serif"">The type and number of chillers for system 7 & 8 (G3.1.3.7) states that you shall model the chillers as indicated on the table. The table shows if you have a peak building load
of more than 600 tons you need to have 2 water cooled centrifugal chillers minimum with no chiller over 800 tons.(see attachments)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Franklin Gothic Book","sans-serif""><img width="509" height="196" id="Picture_x0020_2" src="cid:image002.png@01CECB19.D0A5C9B0" alt="G3.1.3.7.png"></span><span style="font-family:"Franklin Gothic Book","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Franklin Gothic Book","sans-serif""><img width="526" height="296" id="Picture_x0020_3" src="cid:image004.png@01CECB19.D0A5C9B0" alt="table g3.1.3.7.png"></span><span style="font-family:"Franklin Gothic Book","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Franklin Gothic Book","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Franklin Gothic Book","sans-serif"">For the kw they are simply taking the COP=Work done/Work input. So they are converting the cooling tons to kw and dividing it by the COP to obtain chiller demand.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Franklin Gothic Book","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Franklin Gothic Book","sans-serif";color:black">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Franklin Gothic Book","sans-serif";color:black">Matthew J. Baron<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black"><img width="104" height="42" id="Picture_x0020_1" src="cid:image003.png@01CECB1A.8DF27B30" alt="wendel EM"><br>
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</span><span style="font-size:9.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black">Wendel, 140 John James Audubon Pkwy, Suite 201, Buffalo, NY 14228<br>
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</span><b><span style="font-size:9.0pt;font-family:"Georgia","serif";color:black">f</span></b><span style="font-size:9.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black"> 716.625.6825
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</span></b><span style="font-size:9.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black">wendelcompanies.</span><span style="font-size:1.0pt;font-family:"Franklin Gothic Book","sans-serif";color:black">
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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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