I think I’ve come up with a pretty ideal solution, but I haven’t been able to implement it yet (parts on their way from China). I have to work outside and it can get hot, but worst of all it can be pretty humid too, so I needed something thermostat controlled to stay above the dew point and avoid condensation. So I wanted:
- temperature control
- no compressor to turn on and off
Naturally I considered Peltiers, and read a ton about them. That is certainly a more elegant solution, but I think mine will be simpler and cheaper.
I plan on having two lunchbox coolers. The first will be my closed- loop distilled water circuit running through my flow sensor, temperature sensor, and laser tube. The second will be a cold, tap-water tank to which I can add frozen water bottles, ice packs, etc.
A secondary pump in the distilled water cooler will operate a second circuit for the distilled water that passes through an aluminum cooling block located in the ice-water cooler.
The thermostat will control the secondary pump so that the extra cooling circuit only operates when necessary allowing temperature control.
This will allow me to isolate the distilled water from the ice water and keep me from having to reach in and out of the water going to the laser.
I’ll be sure to post the results when all of my parts get here in a couple weeks, but what do you think?