never seen wb and db temps the same exiting the evap
Your theory would be correct if you could have 100% of the air move across the surface of the coil.
That is correct BigJon. Some air does not contact the fins, hence the air will Be about 95% RH. Only if you had 100% coil contact would the answer be true. The coil manufacturers are getting closer but are not there yet.
In theory it should be true, but in practice it is false.
If you can get 100% of the air to move across coil surface.
That's not possible as far as I know.
You will be left with some air that is not conditioned at all.......I have done it many times......very close to 100% RH.......never 100%......in a true or false question asking for 100% and actually seeing 99.9% makes it false.
enlighten me if I'm wrong....I can only go by real world exp.
if 80% of the air contacts the coil and is dehumidified and sensibly cooled....then your left with 20% that was not 100% saturated.......add that to the equation......I can't think of any other way it comes out other than <100% saturated.
Simple physics... if air is cooled below the dewpoint it is at 100% humidity. I'll admit that its kind of a trick question... but its a fact nonetheless
From Wikipedia, the free encyclopedia
The dew point (sometimes spelled dewpoint) is the temperature to which a given parcel of air must be cooled, at constant barometric pressure, for water vapor to condense into water. The condensed water is called dew. The dew point is a saturation point.
When the dew point temperature falls below freezing it is called the frost point, as the water vapor no longer creates dew but instead creates frost or hoarfrost by deposition.
The dew point is associated with relative humidity. A high relative humidity indicates that the dew point is closer to the current air temperature; if the relative humidity is 100%, the dew point is equal to the current temperature. Given a constant dew point, an increase in temperature will lead to a decrease in relative humidity.
At a given barometric pressure, independent of temperature, the dew point indicates the mole fraction of water vapor in the air, and therefore determines the specific humidity of the air.