Changing fluid or refilling is not necessary with well designed systems, because they are made to avoid or minimize losses (including vapor) or contamination. We found that spilling liquid while pouring in and out of containers is by far biggest source for losses, and we have integrated ways to avoid spills on initial filling, along with many other technical features that are designed to keep fluid in the tank.
From Allied Contro's FAQs:
http://www.allied-control.com/immersion-cooling/frequently-asked-questions-faqs/item/4-do-i-have-to-change-or-refill-the-liquid
The key difference in open bath immersion cooling is to keep tanks under ambient pressure.
The last thing one knows in constructing a work is what to put first. -- Blaise Pascal
