PSYCHROMETRIC CHART FUNDAMENTALS
ENGINEERING MANUAL OF AUTOMATIC CONTROL
37
Introduction ............................................................................................................ 38
Definitions ............................................................................................................ 38
Description of the Psychrometric Chart .................................................................................................... 39
The Abridged Psychrometric Chart .................................................................................................... 40
Examples of Air Mixing Process ............................................................................................................ 42
Air Conditioning Processes ............................................................................................................ 43
Heating Process .................................................................................. 43
Cooling Process .................................................................................. 44
Humidifying Process ............................................................................................................ 44
Basic Process...................................................................................... 44
Steam Jet Humidifier....................................................................... 46
Air Washers ..................................................................................... 49
Vaporizing Humidifier ...................................................................... 50
Cooling and Dehumidification.............................................................. 51
Basic Process ................................................................................. 51
Air Washers ..................................................................................... 51
Dehumidification and Reheat .............................................................. 52
Process Summary ............................................................................................................ 53
ASHRAE Psychrometric Charts ............................................................................................................ 53
CONTENTS
Psychrometric Chart Fundamentals
ENGINEERING MANUAL OF AUTOMATIC CONTROL