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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Vito et al<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">In all of the great discussion regarding temperature and treatment of PCW in various facilities, I feel obligated to mention one item: Please be aware of your
entire design and operating environment when considering temperature setpoints, especially when it comes to any kind of chilled water. For instance: One response to this thread mentioned they are controlling their PCW to 59 +/- 2F which means you will have
57F water some of the time. That temperature could very well cause condensation if it were implemented in a location where the individual wasn’t aware of their design environment and that environment couldn’t support such a temperature. PCW often runs in
and out of “building” conditioned space with looser tolerances than the cleanroom space. If you are running non-insulated copper and have a higher PCW design temperature that you just lowered - you could have a large problem that could do significant damage
before it was discovered (think about spaces above cleanroom ceilings, etc). As well, depending on whether or not your facility has a 1% or even .1% ASHRAE design temperature – you may not have seen the highest dew point in your room yet. A cleanroom that
is within temperature spec could easily hit a 57F dew point with only a small drift in humidity due to an extremely hot and humid day. In my experience, I have never needed facility PCW to be colder than 18C, and even if it were required in some instances
– I would likely utilize a separate chiller rather than risk problems with condensation.
<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">Thanks<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Peter J Duda</span><span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Technical Manager, Pritzker Nanofabrication Facility</span><span style="font-size:10.0pt;font-family:"Tahoma",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Institute for Molecular Engineering</span><span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">University of Chicago</span><span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">5555 South Ellis Avenue<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Young 006D<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Chicago, IL 60637</span><span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Office: 773-702-8903<br>
Cell: 805-636-2323</span><span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">duda@uchicago.edu<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:#1F497D">ime.uchicago.edu</span><span style="font-size:13.5pt;font-family:"Segoe UI",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> labnetwork-bounces@mtl.mit.edu [mailto:labnetwork-bounces@mtl.mit.edu]
<b>On Behalf Of </b>Vito Logiudice<br>
<b>Sent:</b> Friday, September 11, 2015 2:47 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Temperature specification for facility process chilled water<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black">Dear Colleagues,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black">The process chilled water loop in our cleanroom has consistently oscillated between ~15.4C and ~17.2C over a span of roughly 10 minutes. Our Plant Operations group
is looking into the possibility of tightening this up for us by tuning the control sequence. They have asked for guidance on an acceptable specification. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black">In light of this I would appreciate hearing from you as to your facility’s PCW temperature target and tolerance. Thank you much.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black">Best regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black">Vito<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:black">--</span><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:black">Vito Logiudice P.Eng.</span><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:black">Director of Operations, Quantum NanoFab</span><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:black">University of Waterloo</span><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:black">Lazaridis QNC 1207</span><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:black">200 University Avenue West</span><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:black">Waterloo, ON Canada N2L 3G1</span><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:black">Tel.: (519) 888-4567 ext. 38703</span><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:black">Email: </span><a href="mailto:vito.logiudice@uwaterloo.ca"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif">vito.logiudice@uwaterloo.ca</span></a><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.5pt;font-family:"Calibri",sans-serif;color:black">Website: </span><a href="https://fab.qnc.uwaterloo.ca"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif">https://fab.qnc.uwaterloo.ca</span></a><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.5pt;font-family:"Calibri",sans-serif;color:black"><o:p> </o:p></span></p>
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