tmassey
Contributor
You are still missing the point that I am trying to make and what the article makes....
Forget about relative humidity as it is a stupid measure....
The PMV (if the article is to be believed) will only remove 99.3% of the water (and the maths makes sense as 139/140 is around 99.3%). So there will always be 0.7% of the water that was in the original air left after the PMV. This means that the more water there was in the air to start with, the more water that will be left AFTER the PMV but before the filter stack.
The molecular sieve has to deal with this 0.7%. It can only do this by absorbing it. If there's more water going in there's more water for it to absorb - so it will take less time before it has absorbed all it can.
So at the very least, the humidity of the air at intake will have an affect on how often you need to change the MS in the filter.
The percentage is not an inherent feature. It's derived. In other words, it removes 99.30% of 50% RH moisture, and 99.35% of 75% moisture. This was not put there so you'd use it as a magic absolute perfect linear factor of water removal. That's not how it works. At all.
And RH is an *incredibly* dumb measurement. But it's the key to understanding this. It's the fact that we can *only* start removing moisture using our drains *after* the RH exceeds 100%.
This is the point you seem to be missing. No matter what we start with, our drains will not separate moisture until after the gas exceeds 100%. And once it starts doing that, it will *always* leave our gas *at* 100%. So no matter what our intake RH is (in the realm of real life on Earth), we will end up reaching 100% RH before we get to our filter stacks. At a specific temperature and pressure, the amount of water by mass entering our filter stack will be *identical* no matter what the intake RH was. The different amount of water that entered (based on incoming RH) will simply be the different amount of water leaving our *drain*.
And I'm done with this. Maybe someone else will have better success.