Evaporarive cooling. How to calculate the cooling of the air?

So I'm trying to figure out how effective evaporative coolers are...

Lets say, I have a box with 3 cubic meters of air with a humidity of a 10%. I blow it out with a fan and spary with water as it leaves the fan.
The water is room temp (which is lets say 27 C).

What temperature difference should I expect?
Is there a way to control the amount of humidity by spraying more or less water? (How can I reach 100% humidity versus 40%)?

Thank you very much!

P.S I read wikipedia about Wet bulb, and Dew point... That didn't really helped me out...

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