<div dir="ltr">Dear All,<div><br></div><div>Thank you very much for sharing your experiences.</div><div><br></div><div>There is a design where one puts an expansion tank on the return line for these shared chiller, probably to avoid ripples, flow shocks, that one gets when another tool is being switched ON or OFF. I found a document which is attached which talks about designing such cooling water circuits. This water is only for process equipment cooling, and not facilities equipment cooling.</div><div><br></div><div>If anybody has worked without these expansion tanks, and if using flow settlers is enough that would be great to know, we may need to modify our circuits little bit, if needed.</div><div><br></div><div>Thanks,</div><div>Kamal.</div><div><br></div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Sep 22, 2014 at 8:37 PM, Bob Hamilton <span dir="ltr"><<a href="mailto:roberthamilton@berkeley.edu" target="_blank">roberthamilton@berkeley.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
Kamal Yadav,<br>
<br>
It is difficult to diagnose your issue given the information in your
e-mail. It is possible a single tool is using more water than it
needs and therefore reducing the available volume to tools with
higher impedance cooling circuits. You may also have a blocked
cooling channel in a tool(s). Consider running water through them,
backwards and into an open drain or bucket to back-flush them. <br>
<br>
A question; what purpose does this chiller serve? Does it supply
deionized for rf cooling circuits where the resistivity of the water
is important or does it simply provide equipment cooling? Is it a
heat exchanger (HX) or is it Freon-based centrifigal chiller? Do you
have a rotameter in the cooling loop?<br>
<br>
Assuming the conductance of various tools allows most of the process
cooling water to flow through those tools with lowest impedance
consider adding "flow-setters" to your tools or just to the tool
using too much water. There are dynamic version of flow-setters that
adjust flow to a specific volume of liters-per-minute and maintain
this constant flow over a range of pressure. <br>
<br>
At the Marvell NanoLab we've used flow-setters made of brass, PVC
and stainless depending on the application. If you choose PVC
versions, I'd pick male pipe thread (mpt) over female pipe thread
(fpt). We try and avoid threading metal mpt fittings into plastic
fpt fittings because the plastic fitting may crack at some part of
its service life causing flooding. <br>
<br>
Appended are a few US links that provide an example of the device I
am referring to. I've also seen them on EBAY. <br>
<a href="http://www.deanbennett.com/dole-flow-control-valves.htm" target="_blank">http://www.deanbennett.com/dole-flow-control-valves.htm</a><br>
<a href="http://www.haysfluidcontrols.ca/hays_automatic_flow_controls_2305.htm" target="_blank">http://www.haysfluidcontrols.ca/hays_automatic_flow_controls_2305.htm</a><br>
<a href="http://www.merrillmfg.com/product/08-WellPoints/Merrill-Valves/features.php" target="_blank">http://www.merrillmfg.com/product/08-WellPoints/Merrill-Valves/features.php</a><br>
<a href="http://www.plastomatic.com/fc.html" target="_blank">http://www.plastomatic.com/fc.html</a><br>
<a href="http://www.swtwater.com/catalog/1318_flow_controls.htm" target="_blank">http://www.swtwater.com/catalog/1318_flow_controls.htm</a><br>
<br>
Regards from the MNL,<br>
Bob Hamilton<br>
<br>
<pre cols="72">--
Robert Hamilton
University of California at Berkeley
Marvell NanoLab
Equipment Eng. Mgr.
Room 520 Sutardja Dai Hall
Berkeley, CA 94720-1754
<a href="mailto:bob@eecs.berkeley.edu" target="_blank">bob@eecs.berkeley.edu</a>
e-mail preferred
My personal mobile: <a href="tel:510-325-7557" value="+15103257557" target="_blank">510-325-7557</a>
</pre><span class="">
<br>
<div>On 9/21/2014 11:22 PM, Kamal Yadav
wrote:<br>
</div>
</span><blockquote type="cite"><div><div class="h5">
<div dir="ltr">Dear All,
<div><br>
</div>
<div>We are facing chiller [for cooling water for equipment]
issues, most likely flow issues, probably due to using same
chiller for multiple equipment. Though chiller total cooling
capacity is able to provide flow/pressure but in an shared
equipment scenario, could there be issues. Suddenly some
equipment, in use, trips, because of low flow of cooling water
probably.</div>
<div><br>
</div>
<div>Did anybody faced these issues, are we diagnosing it
correctly?</div>
<div><br>
</div>
<div>Thanks a lot.<br>
<div><br>
</div>
-- <br>
<div dir="ltr">
<div>Thanks,<br>
</div>
<div>Kamal Yadav</div>
<div>Sr. Process Technologist<br>
</div>
<div>IITBNF, EE Department, Annexe,</div>
<div>IIT Bombay, Powai</div>
<div>Mumbai 400076</div>
<div>Internal: 4435</div>
<div>Cell: 7506144798</div>
<div>Email: <a href="mailto:kamal.yadav@gmail.com" target="_blank">kamal.yadav@gmail.com</a>,
<a href="mailto:kamalyadav@ee.iitb.ac.in" target="_blank">kamalyadav@ee.iitb.ac.in</a></div>
</div>
</div>
</div>
<br>
<fieldset></fieldset>
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</pre>
</span></blockquote><span class="HOEnZb"><font color="#888888">
<br>
<pre cols="72">--
Robert Hamilton
University of California at Berkeley
Marvell NanoLab
Equipment Eng. Mgr.
Room 520 Sutardja Dai Hall
Berkeley, CA 94720-1754
<a href="mailto:bob@eecs.berkeley.edu" target="_blank">bob@eecs.berkeley.edu</a>
Phone: <a href="tel:510-809-8600" value="+15108098600" target="_blank">510-809-8600</a>
Mobile: <a href="tel:510-325-7557" value="+15103257557" target="_blank">510-325-7557</a> (Emergencies only poor cell phone service in lab)e-mail preferred
</pre>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr"><div>Thanks,<br></div><div>Kamal Yadav</div><div>Sr. Process Technologist<br></div><div>IITBNF, EE Department, Annexe,</div><div>IIT Bombay, Powai</div><div>Mumbai 400076</div><div>Internal: 4435</div><div>Cell: 7506144798</div><div>Email: <a href="mailto:kamal.yadav@gmail.com" target="_blank">kamal.yadav@gmail.com</a>, <a href="mailto:kamalyadav@ee.iitb.ac.in" target="_blank">kamalyadav@ee.iitb.ac.in</a></div></div>
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