Mixing air how much water leaving?

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    Air Mixing Water
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The discussion revolves around calculating the amount of water leaving an air stream when mixing with the atmosphere, specifically focusing on the formation of fog and droplets. The equation provided, Qwater = Qdry.air.C * (xA - xC), raises questions about the appropriate points for measurement, suggesting that points where relative humidity (RH) equals 100% might be more relevant. Participants recommend utilizing a psychrometric chart to model the processes involved in condensation and fog formation. The cooling processes A-B and A-C are compared to determine if they yield the same amount of condensation. Overall, the conversation emphasizes the importance of accurate modeling in understanding moisture dynamics in air streams.
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I have a situation like this:

Airpsychrometricschangingconditionsfog.gif


Where C is a air stream from a pipe, and A is the sky. Droplet will be made, and there will be fog.

Now I have to calculate the amount of water leaving the air.

In my book I found this equation:

Qwater = Qdry.air.C * (xA - xC)

But do it have to be point C and A? Why not the two points where RH=100% ?

And how do I know how much water that there will be in the air as fog, and how much will raining down?
 
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Thanks for the reply.

Here is the cooling processes into the diagram, A-B and A-C. If you look at the two processes, will they produce the same amount of condense?
 

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I made a pdf of the diagram, with more details on it.
 

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