[labnetwork] Temperature specification for facility process chilled water

[Dennis Schweiger]

Vito,

here at UofMichigan, one of our PCW systems runs about 62.5F (16.9C) with a
daily deviation of about 1F. The second runs about 59-60F (15C).  It too
has a daily deviation of about 1F.  For both systems we may see a seasonal
deviation of 3-4F as the main chiller plant transitions from "free cooling"
to the use of chillers to create cooling water for the campus wide loop.
We also "polish" both loops to 1 meg-ohm so that we have a "high
resistance" in the RF cooling circuits.

Dennis Schweiger
University of Mighigan/LNF

734.647.2055 Ofc

On Fri, Sep 11, 2015 at 3:47 PM, Vito Logiudice <vito.logiudice at uwaterloo.ca
> wrote:

> Dear Colleagues,
>
> 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.
>
> In light of this I would appreciate hearing from you as to your facility’s
> PCW temperature target and tolerance. Thank you much.
>
> Best regards,
> Vito
> --
> Vito Logiudice  P.Eng.
> Director of Operations, Quantum NanoFab
> University of Waterloo
> Lazaridis QNC 1207
> 200 University Avenue West
> Waterloo, ON           Canada N2L 3G1
> Tel.: (519) 888-4567  ext. 38703
> Email: vito.logiudice at uwaterloo.ca
> Website: https://fab.qnc.uwaterloo.ca
>
>
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