Objectives

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Objectives

• Psychometrics
• Psychometric chart
• Examples in AHUs

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Condition Line for a Space
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AHU
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Sensible heating
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Dehumidification by Cooling
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Real Dehumidification Process
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Humidification
hw Specific enthalpy of water added to
system hg Specific enthalpy of saturated water
vapor
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Evaporative Cooling (air washing)
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Adiabatic mixing

• Governing equation

External heat 0!
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Mold in a duct
tsurface lt tdp
Condensation
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Air conditioning
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Recirculation
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Reheat
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Systems Single-Zone Air Systems
Zone any space with a thermostat
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Evaporative Cooler