| Published by the Air Conditioning Contractors of America (ACCA)
The psychometric chart is a graph of the properties (temperature, relative humidity, etc.) of air. It is used to determine how these properties vary as the amount of moisture (water vapor) in the air changes.
- Dry-bulb temperature is the air temperature determined by an ordinary thermometer.
- Wet-bulb temperature reflects the cooling effect of evaporating water.
- Dew point temperature is the temperature below which moisture will condense out of air.
- Relative Humidity is a measure of how much moisture is present compared to how much moisture the air could hold at that temperature.
The versatility of the psychrometric chart lies in the fact that by knowing just two properties of moist air, the other properties can be determined. |
