From: Philip Marder (marder@iquest.net)
Date: Thu May 14 1998 - 09:17:27 EST
Kent, I believe that most of the lasers we are talking about here have flow rate and/or pressure sensors for the laser cooling water. Decreasing the flow rate might not be the answer. Phil Marder On Wed, 13 May 1998, Kent Cavender-Bares wrote: > > Hi All, > > I may not be thinking about this correctly, but it seems to me that > when using a heat exchanger system (like the LaserPure) connected to a > building chilled water system, that "over-cooling" leading to condensation > should be somewhat easy to cure. Since the chilled water does not pass > directly through the laser, it is the flowrate of chilled water of a given > temperature which will determine the temperature of the water circulating to > the laser (for a given chilled water temperature, and a given heat > exchanger). If one can monitor the temperature of the incoming chilled > water, it should be possible to adjust the flow of the chilled water to meet > the cooling needs of the laser(s). That is, in summer (when chilled water > systems are typically cooler) the chilled water valve could be opened less > than in the winter. This could be a problem if the heat exchanger requires > a minimum flowrate of chilled water, then the option with a mixing valve as > presented earlier today seems like the way to go. Also, the more complex > solution would be advisable if a fail-safe system is required in a lab with > multiple users. Warm or cold, though, these things sure are loud! A good > wrapping in insulation makes it more bearable if it must stay in the flow lab... > > Hope this helps someone, > Kent > >
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