Interesting topic, and while I'd admit I don't have more than a passing understanding of all the physics that is involved in the formation of condensation and other atmospheric related things, I understand what I need to do to prevent it forming on my cold blocks and tubes.
A factor not to forget is where I live, (UK), and it rarely gets to 30C let alone above that. Mostly its 20C and 75% of the year that is artificially raised by house heating. Central heating tends to dry out the air a bit raising the due point as well. The chart shows the dew point at the humidity % at a certain temp and like I said it seems accurate to my personal findings using temp and humidity gauges. 100% humidity is very unlikely unless you are in a tropical rain forest although parts of the us can get near 100% I hear? Also rain has little to do with it as It's often high 30% low 40% when its rain in the summer here.
Like said there are so many specific variables to my plan the only way to know if this will work, and how well is to build it, just can't be worked out on paper or via equations at least not to my mind anyway.
I'm the opposite I hate "wet" air and find it uncomfortable when it gets above 60% humidity. We are all different as a girlfriend years ago continually complained of drying out on a trip to the US. The air-conditioning in the malls and cars, (we were in Florida), affected her badly where as I liked it full on ice cold and it didn't appear to dehydrate me, it was an excellent excuse for us to argue and fight, not that she really needed a reason....
