CW-5200 chiller

[Steve Baker]

(Speaking of chillers...)

For our second lasersaur, we were sent a CW-5200 chiller instead of the
CW-5000 that we ordered...same price, same everything!

This unit claims to be able to cool *TWO* 100 watt lasers.

Since we happen to have two 100 watt lasersaurs, it might be attractive to
run both lasers off the same chiller (to keep the noise levels down, for
example).

My question is whether it's safe to run the hoses through the two lasers
in series - or should it be in parallel?

I'm concerned that if I run the hoses in series (ie, from chiller to laser
#1, then from the outlet of #1 into laser #2 and then from the outlet of
#2 back to the chiller) then the temperature rise through the first laser
will result in the second one running at a higher temperature - and
thereby damaging it.

But if I run the hoses in parallel (ie, through a "Y" connector to both #1
and #2 inlets and then take the #1 and #2 outlets into another "Y"
connector back to the chiller) - I'm concerned that if one laser has a
slightly higher resistance to the flow than the other, then the majority
of the water will flow through the lower resistance path and the other one
will overheat.





-- Steve

[Chris Uhlik]

FWIW, my opinion is that the resistance difference will be small, so the flow rates will be within 20% or so.  The temperature rise from a 20% lower flow rate is a lot smaller than the 100% temperature rise by running series.

Chris

 -- Steve

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[Jonathan Buford]

I would agree with Chris, as long as the paths are similar lengths and the size of the tubing is similar, the difference in flow rates will be pretty minor in comparison to the difference in cooling potential using the warmer water on the second laser in series. The big thing with thermo transfer will be the delta in temperature if all things are equal. In the series case, there is a significantly smaller delta on the second unit. Even with 70% of the flow, it would still tend to pull more heat away.