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Thermodynamics filled in class notes_Part_44

# Thermodynamics filled in class notes_Part_44 - 95 3.4...

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95 Considering an air water vapor mixture, one models the water vapor as an ideal gas and expresses the total pressure as P = P a + P v . (3.258) Here v denotes vapor and a denotes air. A good model for the enthalpy of the water vapor is to take h v ( T, low P ) = h g ( T ) . (3.259) If T is given in degrees Celsius, a good model from the steam tables is h g ( T ) = 2501 . 3 kJ kg + p 1 . 82 kJ kg C P T. (3.260) Some deFnitions: absolute humidity : ω , the mass of water present in a unit mass of dry air, also called humidity ratio, ω m v m a , (3.261) = M v n v M a n a , (3.262) = M v M a P v V RT P a V RT , (3.263) = M v P v M a P a , (3.264) = ( 18 . 015 kg kmole ) P v ( 28 . 97 kg kmole ) P a , (3.265) = 0 . 622 P v P a , (3.266) = 0 . 622 P v P P v . (3.267) dew point : temperature at which the vapor condenses when it is cooled isobarically. saturated air

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Thermodynamics filled in class notes_Part_44 - 95 3.4...

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