Psychrometric Chart Jun 2026

RH) by evaporating water into it, depicted as diagonal lines.

The temperature at which water vapor begins to condense, found by moving horizontally left to the saturation line. Enthalpy ( psychrometric chart

The old paper was the color of weak tea, stained at the edges where someone’s coffee cup had rested decades ago. To anyone else, it was a relic—a spiderweb of diagonal lines, swooping curves, and tiny numbers printed in a font that had gone out of style before the moon landing. RH) by evaporating water into it, depicted as diagonal lines

To effectively use a psychrometric chart, follow these steps: To anyone else, it was a relic—a spiderweb

or RH): The ratio of the actual water vapor pressure to the saturation vapor pressure, displayed as curved lines ranging from 0% to 100%.

. ProcessSensing.com +4 How to Use the Chart Plot a State Point: Identify two known values (e.g., 75°F DBT and 50% RH) and find where their respective lines intersect. Determine Other Properties: From that intersection, follow the lines for WBT, dew point, or enthalpy to the edges of the chart to find those values. Trace Processes: You can plot changes to air conditions: Sensible Heating/Cooling: Moving horizontally (left for cooling, right for heating) because moisture content stays the same. Humidification/Dehumidification: Moving vertically (up for adding moisture, down for removing it). Evaporative Cooling: Moving diagonally along a constant wet bulb temperature line. Scribd +5 Common Applications HVAC Design: Calculating the cooling or heating load required for a specific building zone. Human Comfort: Identifying if a room's conditions fall within the "Comfort Zone" (typically between 68°F–78°F and 30%–60% RH). Agriculture: Determining optimal times for grain aeration or drying based on ambient air conditions. AAON +4 For more technical details, you can refer to professional guides like the ASHRAE Fundamentals of Psychrometrics or use interactive tools like the ASHRAE Thermal Comfort Tool . Would you like to walk through a