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Kevin -
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<div>Most modern cleanrooms have a central PCW systems AND water cooled poInt of use chillers and heat exchangers as each chamber/tool will have different heat load and temperature set point requirements.</div>
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<div>In your case you will need air cooled chillers. Option 1 is what I would recommend in his instance. You should consider some standardization/redundancy such that the units can be interchanged between tools/chambers so you can have some flexibility in
the event of an unplanned failure.</div>
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<div>We can help you with air cooled chillers - it’s one of our core competencies.</div>
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<div id="AppleMailSignature">Rob Breisch
<div>801-726-5035</div>
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On Aug 31, 2018, at 9:34 AM, Kevin McPeak <<a href="mailto:kmcpeak@lsu.edu">kmcpeak@lsu.edu</a>> wrote:<br>
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<div dir="auto">Dear Colleagues,
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<div dir="auto">The central chilled water pump at the facility where the LSU cleanroom is housed died earlier this week. Facilities told me that they have no plans for replacing the pump. The cost is too high (15K) and most of the beamline endstations (our
cleanroom lives inside of a synchrotron) have switched to local chillers.</div>
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<div dir="auto">So I have two options:</div>
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<div dir="auto">1). Buy 4 small chillers for an e-beam evaporator, SEM, ICP, sputtering system. This number will grow in the future.</div>
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<div dir="auto">2). Buy one large chiller and connect it to the existing 2" diameter cooling pipe network that is plumbed around the cleanroom perimeter.</div>
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<div dir="auto">I lean towards option #2 but it is less flexible than #1 and could put us in the same situation we are in now (e.g. most machines down) in the case of a failure.</div>
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<div dir="auto">The infastructure of our cleanroom is about 25 years old. So I wanted to ask the list members to get a more modern take on chilled water. Do modern cleanrooms use central chilled water systems or is the local chiller model more popular given
the added flexibility and more distributed failure model?</div>
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<div dir="auto">Thanks!</div>
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<div dir="auto">Regards,</div>
<div dir="auto">Kevin</div>
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<div data-smartmail="gmail_signature" dir="auto">--<br>
Kevin McPeak<br>
Assistant Professor<br>
Department of Chemical Engineering<br>
Louisiana State University<br>
email: <a href="mailto:kmcpeak@lsu.edu">kmcpeak@lsu.edu</a><br>
phone: 225-578-0058</div>
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