I've been lucky enough to buy a completely new 80W sealed laser tube locally, being Chinese and second hand there is less than a trace of documentation, so I have no hard data on how to cool it.
I'm hoping someone here can recognize the type and point me at the datasheet:https://plus.google.com/105359218037313 ... FgYBEUwebb
... or tell me the data for your tube:
* Maximum outlet temperature
* Maximum temperature difference between inlet and outlet
* Minimum water flow.
My current thinking is that the tube is that I need to get rid of around 800 Watt while keeping the temperature difference down to a maximum of 30 deg C when moving at least 4 liters per minute, but getting 800W out of water is hard when the temperature difference between air (22 deg C) and the water is so low.