[labnetwork] Humidification System Design

[Vito Logiudice]

John,

I too will echo everyone else’s comments. In our case we came to what we deemed to be a reasonable compromise with RO water rather than full DI. Something else to consider with the approach your designers have proposed is the risk to your humidification system should you be in an area of very hard water (as is our case) and should the water softening system fail. The attached photo shows the mineral deposits that were noted on stainless steal steam distribution coils when such a failure occurred in one of our non-cleanroom systems.

Good luck
Vito
--
Vito Logiudice  MASc, PEng
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: Quantum NanoFab<https://qncfab.uwaterloo.ca>


From: John Nicholson <thejohnnicholson at gmail.com<mailto:thejohnnicholson at gmail.com>>
Date: Wednesday, February 4, 2015 at 5:22 PM
To: Labnetwork <labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>>
Subject: [labnetwork] Humidification System Design

Hello all,
       We are currently in a design review process for a new class 1000 clean room on campus and the design architects have come up with a scheme that mixes RO steam with the existing building steam (containing softeners and whatever minerals the local city water has) to humidify the clean room. I am of the opinion this is a bad idea. Your opinions would be greatly appreciated as well as references to any design standards (ASHRAE?) you may know of for this type of humidification system.

Regards,
John

--
John Nicholson
Nanofabrication Laboratories Manager
MassNanoTech Nanofabrication Facility
Conte Center for Polymer Research, Rm. B111
University of Massachusetts Amherst
120 Governor's Drive
Amherst,MA 01003-9305
Phone: 413-545-2772
Fax: 413-577-0165
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