ME300Lecture16

ME300Lecture16 - Lecture 16: Psychrometric Chart...

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16.1 Lecture 16: Psychrometric Chart T wb = constant T T db = constant T dp T wb Psychrometric Chart: • Graphical relationship between T db , T wb , T dp , , , h, and v • Valid only for one constant pressure • Useful for visualizing air-water vapor processes at constant pressure h = constant v = constant
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16.2 Psychrometric Chart
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16.3 Example 16.1 T 90 o F T db = 1.0 = 0.7 T dp,1 T wb,1 Given: Air-water vapor mixture at T db,1 = 74 o F, p 1 = 14.7 psia, 1 = 37.5% Find: 1 , T dp,1 , T wb,1 , h 1 , v 1 Solution: h 1 v 1 1
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16.4
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16.5 Continue Psychrometrics Psychrometric Applications: » Cooling with and without Dehumidification » Cooling with Dehumidification and Reheating » Evaporative Cooling » Humidification » Humidification with Heating » Adiabatic Mixing » Cooling Tower
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16.6 Cooling with and without Dehumidification Typical Application: » Evaporator of a vapor compression cycle: – During the evaporation of the refrigerant, heat is absorbed from an air stream
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ME300Lecture16 - Lecture 16: Psychrometric Chart...

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