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Application of Psychrometric chart - Printable Version

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Application of Psychrometric chart - Pankaj Garg - 06-02-2019

Application of Psychrometric chart
Effect of Temperature on Humidity
[Image: image-38.png]
•The moisture-holding capacity of the air depends on the air temperature. •Warm air can hold more moisture than cold air.•The same humidity ratio results in different relative humidities at different temperatures.
Sensible Heating and Cooling
Horizontal movement on the psychrometric chart (no change in absolute humidity)
[Image: image-39.png]
Humidification
Humidification with steam or water spray will increase the humidity ratio and relative humidity.
[Image: image-40.png]
Dehumidification
Cooling is the most common method for dehumidifying moist air.
[Image: image-41.png]
[Image: image-42.png]
If moist air is cooled to the saturation curve,  further cooling will reduce temperature and remove moisture
Evaporative Cooling
[Image: image-43.png]
•Evaporative cooling can be accompanied by humidification of warm dry air.
•Sensible heat loss = Latent heat gain (no change in enthalpy)
•Upward movement along a line of constant enthalpy
•Energy saving cooling device in hot-dry  climatic region

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