[labnetwork] pressure independent valves on exhaust?

[Tom Reynolds]

We also just have manual blast gates.  It is simple and much lower initial
cost.  Our lab is used 24/7 so your lab use should be considered as to how
often the sash would actually be closed, either manual or automated close,
and how much energy would be saved.  Controls are not zero
cost/upkeep/maintenance.

--------------------------------------------------------------
Tom Reynolds,  Lab Manager
UCSB Nanofabrication Facility
Electrical and Computer Engineering Dept.
Engineering Science Bldg #225, Room 1109E
Santa Barbara, CA 93106
805-893-3918 x215  office
805-451-3979  cell
805-893-3918  fax
reynolds at ece.ucsb.edu



-----Original Message-----
From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu]
On Behalf Of Morrison, Richard H., Jr.
Sent: Wednesday, April 23, 2014 12:03 PM
To: Iulian Codreanu; Fab Network
Subject: Re: [labnetwork] pressure independent valves on exhaust?

We use blast gates, they just block the duct and they are pinned to get a
flow that allows the 100 fpm at the face of the hood. So we have maximum
exhaust 24 hours per day.

We were going to use variable exhaust dampers on the duct work so that we
could close the hood sash at night time to save $$. The upfront cost of the
dampers and control system upgrade was high and the payback time period to
long to justify the expense. Now we are stuck with a wasteful operation. It
is very difficult to retrofit the systems due to lack of room to modify the
duct work. So add the dampers and control software up front and it saves you
many $$ in operating cost.

Rick


-----Original Message-----
From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu]
On Behalf Of Iulian Codreanu
Sent: Wednesday, April 23, 2014 9:08 AM
To: Fab Network
Subject: [labnetwork] pressure independent valves on exhaust?

Good Morning.

Do you have "pressure-independent" valves on the exhaust of the cleanroom
equipment (wet benches included)?  If you do not, what were the reasons and
what do you use instead?

Thank you very much.

Iulian

--
iulian Codreanu, Ph.D.
Director of Operations, UD NanoFab
University of Delaware
163 ISE Lab
221 Academy Street
Newark, DE 19716
302-831-2784


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