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AE202 Name______________________ Lecture 2.1 Psychrometry Date_______________________ Reading: MEEB (10thEdition) Section 8.12 Psychrometry Definition Psychrometric Chart 1. Dry Bulb Tdb– air temperature 2. Wet Bulb Twb– temperature of wet bulb thermometer 3. Saturation Line Points at which air cannot hold additional moisture 4. Relative Humidity (%) At a specific temperature, the amount of moisture in the air as a percentage of the maximum or saturation amount 5. Dew Point (°F) Given a psychrometric condition (Tdb, Twb), the temperature (lower) at which dew will form 6. Specific Volume (v) The reciprocal of density (ft3/lb) 7. Humidity Ratio (W) (lb/lb) Amount of moisture by weight within a given weight of air 8. Enthalpy (h) (BTU/lb) Total heat (sensible and latent) in the air-moisture mixture
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Problem 1-5 Find the properties of room air at 70°F, 50% RH [show units] 1. Wet Bulb temperature ___________________ [ ] 2. Humidity Ratio ________________________ [ ] 3. Specific Volume ______________________ [ ] 4. Enthalpy ______________________________ [ ] 5. Dew Point ____________________________ [ ]