[labnetwork] Shared Chiller [for equipment cooling] Issues

[Bob Hamilton]

Kamal Yadav,

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.

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?

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.

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.

Appended are a few US links that provide an example of the device I am 
referring to. I've also seen them on EBAY.
http://www.deanbennett.com/dole-flow-control-valves.htm
http://www.haysfluidcontrols.ca/hays_automatic_flow_controls_2305.htm
http://www.merrillmfg.com/product/08-WellPoints/Merrill-Valves/features.php
http://www.plastomatic.com/fc.html
http://www.swtwater.com/catalog/1318_flow_controls.htm

Regards from the MNL,
Bob Hamilton

-- 
Robert Hamilton
University of California at Berkeley
Marvell NanoLab
Equipment Eng. Mgr.
Room 520 Sutardja Dai Hall
Berkeley, CA 94720-1754
bob at eecs.berkeley.edu
e-mail preferred
My personal mobile: 510-325-7557


On 9/21/2014 11:22 PM, Kamal Yadav wrote:
> Dear All,
>
> 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.
>
> Did anybody faced these issues, are we diagnosing it correctly?
>
> Thanks a lot.
>
> -- 
> Thanks,
> Kamal Yadav
> Sr. Process Technologist
> IITBNF, EE Department, Annexe,
> IIT Bombay, Powai
> Mumbai 400076
> Internal: 4435
> Cell: 7506144798
> Email: kamal.yadav at gmail.com <mailto:kamal.yadav at gmail.com>, 
> kamalyadav at ee.iitb.ac.in <mailto:kamalyadav at ee.iitb.ac.in>
>
>
> _______________________________________________
> labnetwork mailing list
> labnetwork at mtl.mit.edu
> https://www-mtl.mit.edu/mailman/listinfo.cgi/labnetwork

-- 
Robert Hamilton
University of California at Berkeley
Marvell NanoLab
Equipment Eng. Mgr.
Room 520 Sutardja Dai Hall
Berkeley, CA 94720-1754
bob at eecs.berkeley.edu
Phone: 510-809-8600
Mobile: 510-325-7557 (Emergencies only poor cell phone service in lab)e-mail preferred

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://mtl.mit.edu/pipermail/labnetwork/attachments/20140922/8279f685/attachment.html>